Physics Unit7: Linear Momentum - 题库网 (tiku.one)

1#

What is the SI unit of mom / n p1sbny.x5f1naa kho u;(9st4u;dqentum?

A. Nm

B. N/s

C. Ns

D. N/m

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2#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

When a cannon fires a cannonball, the cannon will rlsx8 hzd3 (r1uecoil backward because the

A. energy of the cannonball and cannon is conserved.

B. momentum of the cannonball and cannon is conserved.

C. energy of the cannon is greater than the energy of the cannonball.

D. momentum of the cannon is greater than the energy of the cannonball.

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3#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A freight car moves along a frictionless level rjc05 jpgoe80iailroad track at constant speed. The car is open on top. A large load of coal is suddenly dumpe8piejc5 o00 gjd into the car. What happens to the velocity of the car?

A. It increases.

B. It remains the same.

C. It decreases.

D. cannot be determined from the information given

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4#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A child falls sideways off a sled while sledding on frictionless2z m(6wnnz a c9n t/n.rwy2gf6 ice. What happens to the wcawyn2mgfr n.96(t nz/nz62 velocity of the sled?

A. It increases.

B. It remains the same.

C. It decreases.

D. cannot be determined from the information given

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5#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A rubber ball and a lump of putty have equal mass. They are thrown 6kj xb(a /z;hw u0-ybxwith equal speed against a wall. The ball bounces ( ubxb 6y0 h/;azj-kwxback with nearly the same speed with which it hit. The putty sticks to the wall. Which objects experiences the greater momentum change?

A. the ball

B. the putty

C. Both experience the same momentum change.

D. cannot be determined from the information given

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6#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A sailboat of mass m is moving with a momentum p. How would you represent its j 19gio 7,k-:oggbw dikinetic energy in terms of these two 17-, wb o:odigjg9gik quantities?

A. $p^2/2m$

B. $\frac{1}{2} mp^2$

C. $mp$

D. $\frac{1}{2} mp$

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7#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you pitch a baseball with twic 8t zhm:v2wylb.3c:o/-4lfrnex:lc y e the kinetic energy you gave it in the previous pitc8.2oec: lt b /cxhl wyy4zf-:mn3r:lvh, the magnitude of its momentum is

A. the same.

B. 1.41 times as much.

C. doubled.

D. 4 times as much.

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8#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State Newton's second law i7v)(f5+lcw l*+ a60h3m xt 1zmxlhfn*qxtce en terms of momentum.

该题自我估分: (必填) (满分:1.0分)

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9#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State the law of conservation of momentum. 2zr jk1ry**dnjl, d t92tma;b

该题自我估分: (必填) (满分:1.0分)

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10#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The area under the curve on a Force * pg2 eoi,wy ynga8pc8l4mp1*7 ;whgjversus time (F vs. t) graph represents

A. impulse.

B. momentum.

C. work.

D. kinetic energy.

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11#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Which of the following is an acc)f n5 km*4ttro8odd8murate statement?

A. The momentum of a projectile is constant.

B. The momentum of a moving object is constant.

C. If an object is acted on by a non-zero net external force, its momentum will not remain constant.

D. If the kinetic energy of an object is doubled, its momentum will also double.

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12#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A small car meshes with a large truck in a head-on collision. g*b3ms1ly lvn/x *g q+e6wt*dWhich of the following statements concerning the magnitude of thewv6ml +sxb**3e /yggd*1 ltqn average collision force is correct?

A. The truck experiences the greater average force.

B. The small car experiences the greater average force.

C. The small car and the truck experience the same average force.

D. It is impossible to tell since the masses and velocities are not given.

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13#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two equal mass balls (one red and the other blue) are nk d6 hm63y7pd gxnuh4w1u1agd)c0i7dropped from the same height, and rebound off the floor. The red ball rebounds to a higher position. Which ball is subjectedx7w4m ) 1n7k6du0c 1hdy dh gaiug6pn3 to the greater magnitude of impulse during its collision with the floor?

A. It's impossible to tell since the time intervals and forces are unknown.

B. Both balls were subjected to the same magnitude impulse.

C. the blue ball

D. the red ball

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14#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A Ping-Pong ball moving east at a speed of 4 u,.ttg* bgm 8lv 4lg1rm/s, collides with a stationary bowling ball. The Ping-Pong ball bounces back to the west, atmtl.b* 8gvl,u grg 14nd the bowling ball moves very slowly to the east. Which object experiences the greater magnitude impulse during the collision?

A. Neither; both experienced the same magnitude impulse.

B. the Ping-Pong ball

C. the bowling ball

D. It's impossible to tell since the velocities after the collision are unknown.

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15#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two objects collide and bounce off each other. Linear momentu)jshe d1-pn,5+ec cat m

A. is definitely conserved.

B. is definitely not conserved.

C. is conserved only if the collision is elastic.

D. is conserved only if the environment is frictionless.

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16#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 3.0-kg object moves to tpze.m l,4 x6le,duu)hhe right at 4.0 m/s. It collides head-on with a 6.0-kg object moving to the left at 2.0 )uh,u6lp.4x ,ee lzmdm/s. Which statement is correct?

A. The total momentum both before and after the collision is 24 kgm/s.

B. The total momentum before the collision is 24 kgm/s, and after the collision is 0 kgm/s.

C. The total momentum both before and after the collision is zero.

D. None of the above is true.

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17#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 100-kg football linebacker moving at 2.0 m/s tackles head-onxj7hfw7 lu v2 v80 smi9w0fgg7 an 80-kg halfback runuf2l8j 70g vfwgv9w i0smx77hning
3.1 m/s. Neglecting the effects due to digging in of cleats,

A. the linebacker will drive the halfback backward.

B. the halfback will drive the linebacker backward.

C. neither player will drive the other backward.

D. this is a simple example of an elastic collision.

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18#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

In an elastic collision, if the momentum is conserved, then wc4:brhne8rj y8c( jb 8qg,;er hich of the following sb8 j8y(; jheqcgbr:rc8 ,en r4tatements is true about kinetic energy?

A. Kinetic energy is also conserved.

B. Kinetic energy is gained.

C. Kinetic energy is lost.

D. none of the above

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19#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

When is kinetic energy conserved?auow;bo*u,jd*e -sdq e ;5(*st ndw s5

A. in elastic collisions

B. in inelastic collisions

C. in any collision in which the objects do not stick together

D. in all collisions

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20#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

In a game of pool, the white cue ball hits the #5 balmfc l43gblwt594 u*g kl and stops, while the #5 ball moves away with the same velocity as the cue ball had originally. The tbl mtg53w*kc4 u94l fgype of collision is

A. elastic.

B. inelastic.

C. completely inelastic.

D. any of the above, depending on the mass of the balls.

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21#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

When a light beach ball rolling with a speed of 6.0 m/s col(fxvi; b k4f/xlides with a heavy exercise ball at rest, the beach ball's speed after the collision will be, apprv4x;fb/f ixk(oximately,

A. 0.

B. 3.0 m/s.

C. 6.0 m/s.

D. 12 m/s.

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22#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A golf ball traveling 3.0 m/s :a qnmqc3s2lq k04t7f to the right collides in a head-on collision with a stationary bowling ball in a friction-free environment. If the collision is almost perfectly elastic, the speed of the golf ball immediately after the con k tq 32mqls7q0:fc4allision is

A. slightly less than 3.0 m/s.

B. slightly greater than 3.0 m/s.

C. equal to 3.0 m/s.

D. much less than 3.0 m/s.

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23#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A rubber ball with a ip vl78nxjfp1w4vut 8ru5v /z3 nl 6n3y p*p8hspeed of 5.0 m/s collides head-on elastically with an identical ball at restl l n67uvpn h3xztij npyvwv5/ufp83r1* 8p 84. What is the speed of the initially stopped ball after the collision?

A. zero

B. 1.0 m/s

C. 2.5 m/s

D. 5.0 m/s

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24#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A very heavy object moving with speed v collides head-on with a vwa6ot,b :a+ pk8i/udc/ kv0suery light object at rest. The collision is elastic, and there is no friction. The heavy object b6suvauwp/, kta/+k :c bi80od arely slows down. What is the speed of the light object after the collision?

A. nearly v

B. nearly 2v

C. nearly 3v

D. nearly infinite

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25#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A very light object moving with speed v8 ozpk n7igta,:(p vfwf, v;w: collides head-on with a very heavy object at rest, in a frictionless environment. The collision is almost perfectly ela7va np : fw( piv,k:;tgoz8f,wstic. The speed of the heavy object after the collision is

A. slightly greater than v.

B. equal to v.

C. slightly less than v.

D. much less than v.

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26#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A red ball with a velocity of +3.0jd5dz ,n2c5r6 zub+ vr m/s collides head-on with a yellow ball of equal mass moving with a velocity of -2.0 m/s. What is the velocity of the yellow ball adrz u2vd,cj r6nz+ 55bfter the collision?

A. zero

B. +3.0 m/s

C. -2.0 m/s

D. +5.0 m/s

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27#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A very heavy object moving with velocity v c28o1*u )jjy jjsk p8igollides head-on with a very light object moving with velocity -v. The collision is elastic, and there is no friction. The heavy object barely slows down. What is8s2juo)jg jypjk i 8*1 the speed of the light object after the collision?

A. nearly v

B. nearly 2v

C. nearly 3v

D. nearly infinite

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28#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

In an inelastic collision, if the momentum is conserve5hbv(;byuscl)/j yl*1/y* ,d s aiw7:xpedzsd, then which of the following statements is/(abdd: lb ji*s 7 *z,xelsc1y / uv)yyshp;5w true about kinetic energy?

A. Kinetic energy is also conserved.

B. Kinetic energy is gained.

C. Kinetic energy is lost.

D. none of the above

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29#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two objects collide and stick together. Kine rgb v8euiq*n*2 7lz3utic energy

A. is definitely conserved.

B. is definitely not conserved.

C. is conserved only if the collision is elastic.

D. is conserved only if the environment is frictionless.

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30#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 3.0-kg object moves to the right at 4.0 m/s. It collidm-bsk/b 0a9 axpd0ifn x5g2 q0es in a perfectly inelastic kxp n-m0aax0sg2 5/qfbdib9 0 collision with a
6.1 kg object moving to the left at 2.0 m/s. What is the total kinetic energy after the collision?

A. $72 \; J$

B. $36 \; J$

C. $24 \; J$

D. $0 \; J$

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31#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A small object collides with a large object and st1.yu4y sclfkwffu5- kmg* 6- kicks. Which object experiences the larger magnitude o5kl--gckk4y6 swy.fum *ffu1f momentum change?

A. the large object

B. the small object

C. Both objects experience the same magnitude of momentum change.

D. cannot be determined from the information given

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32#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

In a game of pool, the white cue ball hits the #9 rbp:if dp, s7;ball and is deflected at a $35^{\circ}$ angle to the original line of motion. What is the angle of deflection below the original line of motion for the #9 ball?

A. $35^{\circ}$

B. $55^{\circ}$

C. $75^{\circ}$

D. $90^{\circ}$

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33#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Consider two unequal masses, M and m. Which of t- ,)ssrtgmkx9he following statements is false s-9xt,rgs )km?

A. The center of mass lies on the line joining the centers of each mass.

B. The center of mass is closer to the larger mass.

C. It is possible for the center of mass to lie within one of the objects.

D. If a uniform rod of mass m were to join the two masses, this would not alter the position of the center of mass of the system without the rod present.

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34#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Which of the following is a false stateme)b 6zb. qttjhq j/pw.wa cl;.)nt?

A. For a uniform symmetric object, the center of mass is at the center of symmetry.

B. For an object on the surface of the Earth, the center of gravity and the center of mass are the same point.

C. The center of mass of an object must lie within the object.

D. The center of gravity of an object may be thought of as the "balance point."

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35#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Tightrope walkers walk.co d a 2uquwuj*2z1l9 with a long flexible rod in order to

A. increase their total weight.

B. allow both hands to hold onto something.

C. lower their center of mass.

D. move faster along the rope.

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36#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A plane, flying horizu5bq-5axw 7j wontally, releases a bomb, which explodes before hitting the ground. Neglecting air resis 5-u w5xbaj7wqtance, the center of mass of the bomb fragments, just after the explosion

A. is zero.

B. moves horizontally.

C. moves vertically.

D. moves along a parabolic path.

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37#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two cars collide head-on on a level friction-frebdokie c+cw73 0;f2rqe road. The collision was completely ine qr+kcf2 ;ec dib03ow7lastic and both cars quickly came to rest during the collision. What is true about the velocity of this system's center of mass?

A. It was always zero.

B. It was never zero.

C. It was not zero, but ended up zero.

D. none of the above

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38#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State Newton's second law for a system of parf50l -omq r,jgticles.

该题自我估分: (必填) (满分:1.0分)

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39#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What is the momentum of a 2000-kg tri90 wt1ebz mi sletood n66.-*uck traveling at 35 m/s?

A. $57 \; kg \cdot m/s$

B. $3.5 \times 10^{4} \; kg \cdot m/s$

C. $7.0 \times 10^{4} \; kg \cdot m/s$

D. $7.0 \times 10^{5} \; kg \cdot m/s$

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40#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1200-kg ferryboat is moving sout izspy18smdv7h(w2:h h at 20 m/s. What is the magnitude of its mommdh :vwsp7(i 8zs2 hy1entum?

A. $1.7 \times 10^{-3} \; kg \cdot m/s$

B. $6.0 \times 10^{2} \; kg \cdot m/s$

C. $2.4 \times 10^{3} \; kg \cdot m/s$

D. $2.4 \times 10^{4} \; kg \cdot m/s$

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41#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A ball of mass 0.10 kg is dropped from a height of 12 m. Its3ss 7hx 0 3k-dbxmsma) momentum when it strikes the grou7m)ax0sx-d ms3ks 3hbnd is

A. 1.5 kgm/s.

B. 1.8 kgm/s.

C. 2.4 kgm/s.

D. 4.8 kgm/s.

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42#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two identical 1500-kg cars are moving perpendicular to each other. O).6)md)pmxxu vm )uttne moves with a speed of 25 m/s due north and the other moves at 15 m/s due eup)).vdmtx m )u)x6mtast. What is the total momentum of the system?

A. $4.4 \times 10^{4} \; kg \cdot m/s$ at $31^{\circ}$ N of E

B. $4.4 \times 10^{4} \; kg \cdot m/s$ at $59^{\circ}$ N of E

C. $6.0 \times 10^{4} \; kg \cdot m/s$ at $31^{\circ}$ N of E

D. $6.0 \times 10^{4} \; kg \cdot m/s$ at $59^{\circ}$ N of E

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43#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A handball of mass 0.10 kg, traveling horizontally at 30 m/s, stri) 7kr +ow vy px2o)tanyxiyiw5: :/qo;kes a wall and rebounds at 24 m/s. What is the change in the momenki57;oayy):qivt ww o+)ry o/2x:pnxtum of the ball?

A. 0.60 kgm/s

B. 1.2 kgm/s

C. 5.4 kgm/s

D. 72 kgm/s

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44#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 0.060-kg tennis ball, inl7l/. rl4qb(brwdvk v, a*tv,itially moving at a speed of 12 m/s, is struck by a racket causing it to rebound in the opposite directiavk /b4v,,v llblrtd( .w*q7r on at a speed of 18 m/s. What is the change in momentum of the ball?

A. 0.36 kgm/s

B. 0.72 kgm/s

C. 1.1 kgm/s

D. 1.8 kgm/s

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45#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 50-kg pitching machine (excluding the baseball) is pl8 pd o5reobnkit-z31-q5 yjwt j/(j7jaced on a frozen pond. The machine fires a 0.40-kg baseball with a speed of 35 m/s in the horizontal direction. What is the re8kqz1 5b/ j 3n-ido(jtt5pjje 7ywo-rcoil speed of the pitching machine? (Assume negligible friction.)

A. 0.14 m/s

B. 0.28 m/s

C. 0.70 m/s

D. $4.4 \times 10^{3} \; m/s$

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46#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 70-kg astronaut is space-walking outside the yc4uj7;ol rz-q*k8 i 4e:t rfsspace capsule and is stationary when the tether line breaks. As a means of returning to the capsule he throws his 2.0-kg space hammer at a speed of 14 m/s away from the capsu7kzt:eqro4c8jrl4s uify*- ; le. At what speed does the astronaut move toward the capsule?

A. 0.40 m/s

B. 1.5 m/s

C. 3.5 m/s

D. 5.0 m/s

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47#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A small object with momentum 5.0 kgmc2lb.nuub9;3 cwl p8pu;qd*j /s approaches head-on a large object at rest. The small object bounces straight back with a momentum of magnitude 4.0 kgm/s. What is the magu ncd;lqul 2 cj;p.8u3 pb9w*bnitude of the large object's momentum change?

A. 9.0 kgm/s

B. 5.0 kgm/s

C. 4.0 kgm/s

D. 1.0 kgm/s

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48#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You (50-kg mass) skate o; hbd2v topiuz6an4 x)k441etg ,ky :xn ice at 4.0 m/s to greet your friend (40-kg mass), who is standing still, with open arms. As you collide, while holding each other, with what speed do you both move off together?)g6k ,txxt4opivh2:n4 uek yz; dba4 1

A. zero

B. 2.2 m/s

C. 5.0 m/s

D. 23 m/s

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49#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A car of mass 1000 kg moves to the right along a level, straight8y zi;/8bea o0e4a (z4drbuux road at a speed of 6.0 m/s. It collides directly with a stopped motorcycle of mass 200 kozubb88zey0ai4x dru (a4e/ ;g. What is the total momentum after the collision?

A. zero

B. 6000 kgm/s to the right

C. 2000 kgm/s to the right

D. 10,000 kgm/s to the right

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50#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1000-kg car traveling at 25 m/s runs into the rear mrmi;-+prf* j of a stopped car that has a mass of 1500 kg anrm-*;i+jpf mrd they stick together. What is the speed of the cars after the collision?

A. 5.0 m/s

B. 10 m/s

C. 15 m/s

D. 20 m/s

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51#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A railroad freight car, mass 15,000 kg, is allowi o4g ,8eipjmb3y (hr8ed to coast along a level track at a speed of 2.0 m/s. It collides and couples witgii hy b3orpm8e4j8(,h a 50,000-kg second car, initially at rest and with brakes released. What is the speed of the two cars after coupling?

A. 0.46 m/s

B. 0.60 m/s

C. 1.2 m/s

D. 1.8 m/s

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52#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A railroad car, of mass 200 kg, rolls-npx bi mu 7g.f8oh.b,rbd31d .;c ibn with negligible friction on a horizontal track with a speed of 10 m/s. A 70-kg stunt man drops straight down a distance of 4.0 m, and7nnrdm.bu- ,di;b pogfb 3bxi8h. .1c lands in the car. How fast will the car be moving after this happens?

A. 2.8 m/s

B. 4.7 m/s

C. 7.4 m/s

D. 10 m/s

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53#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 60-kg person walks on a 100-kg log at the rate of 0.80 m/8 q4 /hjap,//1dap mrig ai.yms (with respect to the log). With what speeryjpamqi ma4/ g/.dih1,pa8/ d does the log move, with respect to the shore?

A. 0.24 m/s

B. 0.30 m/s

C. 0.48 m/s

D. 0.60 m/s

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54#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 4.0-N force acts for 3.0ay3uw0s stq y:f,5j/ xiat3i ; s on an object. The force suddenly increases to 15 N and acts for one more second. What i;x3 qtua/: ,si3yisjt0ya5w f mpulse was imparted by these forces to the object?

A. $12 \; N \cdot s$

B. $15 \; N \cdot s$

C. $19 \; N \cdot s$

D. $27 \; N \cdot s$

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55#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A constant 9.0-N net force acts for 2.0 s oq 8stp1 . 2hrcgg2(odzqmn,u3n a 6.0-kg object. What is the object's chg21cqq ud npg r(z,t.3m8h2s oange of velocity?

A. 3.0 m/s

B. 9.0 m/s

C. 27 m/s

D. 110 m/s

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56#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 2000-kg car, traveling to the right at 30 m/s, collides with a brick wall and 95d rhw;.jf+)+,if 0iu. tju bgm sw1ui rtu-xcomes to rest in 0.2iwtfbjujdt1 uw+)-;si.x u. u+0rm fir,gh9 5 0 s. What is the average force the car exerts on the wall?

A. 12,000 N to the right

B. 300,000 N to the right

C. 60,000 N to the right

D. none of the above

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57#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 2.0-kg softball is pitched to you at 20 m/s. You hit the balne lvkgqzw,8t(r-c 1* l back along the same path, and at the same speed. If the bat was in contact with c qrtnl,k ve-*(1w 8zgthe ball for 0.10 s, what is the magnitude of the average force the bat exerted?

A. zero

B. $40 \; N$

C. $400 \; N$

D. $800 \; N$

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58#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 0.10-kg ball is dropped onto a table top. The speeds of the balrt-(utu6bp z0h a:e me7n3:ctl right before and right after hitting the table top7hca u m63b:-up(t t0nt:ezre are 5.0 m/s and 4.0 m/s, respectively. If the collision between the ball and the table top lasts 0.15 s, what is the magnitude of the average force exerted on the ball by the table top?

A. $0.67 \; N$

B. $1.3 \; N$

C. $3.0 \; N$

D. $6.0 \; N$

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59#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A machine gun, of mass 35.0 kg, fires 50.0-gram bullets, with a muzzle 4y73/ nkqif2-l upmtk velocity of 750 p3u4m- /ink27qt k ylfm/s, at the rate of 300 rounds per minute. What is the average force exerted on the machine gun mount?

A. $94.0 \; N$

B. $188 \; N$

C. $219 \; N$

D. $438 \; N$

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60#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A fire hose is turned on the door of a burning building if. uv wrjf0 t5paf22a4n order to knock the door down. This requires a force of 1000 N. If the hose delivers 40 kg per second, what is thwrfj. tfuv52p 20aa4fe minimum velocity of the stream needed, assuming the water doesn't bounce back?

A. 15 m/s

B. 20 m/s

C. 25 m/s

D. 30 m/s

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61#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Water runs out of a horizontal drainpipe at the rate of v83q(i vo/thg120 kg per minute. It falls 3.20 m to the ground. Assuming the water doesn't splash up, what average force does it exert on theg/tv 3hq8i ov( ground?

A. $6.20 \; N$

B. $12.0 \; N$

C. $15.8 \; N$

D. $19.6 \; N$

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62#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A toy rocket, of mass 0.12 kg, achi0 )r uva.*ds:dwcq oe (5pl7vueves a velocity of 40 m/s after 3.0 s, when fired straight up. What average thrust force does the c dp *sulq7( w.dvr0a5):o evurocket engine exert?

A. $1.2 \; N$

B. $1.6 \; N$

C. $2.8 \; N$

D. $4.4 \; N$

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63#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two astronauts, of masses 60 kg and 80 kg, are initqz90 yrn 2wlakd w5q6/ially at rest in outer space. Tknq650lwyqzaw92/ d rhey push each other apart. What is their separation after the lighter astronaut has moved 12 m?

A. $15 \; m$

B. $18 \; m$

C. $21 \; m$

D. $24 \; m$

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64#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 3.0-kg object moves to the right with a speed of 2.0 m/s. It collidekq7 ss(mucg yy2kg)m e.hw94:s in a perfectly elastic h:)y9 myge 4ukws.7mgck2( qscollision with a 6.0-kg object moving to the left at 1.0 m/s. What is the total kinetic energy after the collision?

A. $9.0 \; J$

B. $6.0 \; J$

C. $3.0 \; J$

D. $0 \; J$

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65#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 0.10-kg object with a velocity of 0.20 m/s in 4m9x;hnpd :r , l,5bql.12ezkayuf yhthe +x direction makes a head-on elastic collision with a 0.15 kg object initially at rest. What is the fiu ,l5;.p bl a4ry219efmh xqkz,ynhd:nal velocity of the 0.10-kg object after collision?

A. -0.16 m/s

B. +0.16 m/s

C. -0.040 m/s

D. +0.040 m/s

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66#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 10.0-g bullet movidf s:0zl q+o+tng at 300 m/s is fired into a 1.00-kg block at rest. The bullet emerges (the bullet does not get efq :z0 tod+l+smbedded in the block) with half of its original speed. What is the velocity of the block right after the collision?

A. 1.50 m/s

B. 2.97 m/s

C. 3.00 m/s

D. 273 m/s

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67#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A proton, of mass m, at rest, is struck head-on by s( b, nfk)z(0.vp69 ejrylqq vreu0e6an alpha-particle (which consisfqjn p,e(vu6kszr q.r0v9(be) ely6 0ts of 2 protons and 2 neutrons) moving at speed v. If the collision is completely elastic, what speed will the alpha-particle have after the collision? (Assume the neutron's mass equals the proton's mass.)

A. zero

B. 2v/3

C. 3v/5

D. 5v/3

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68#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 50-gram ball moving +10 m/s collides head-on with a stationary ba 6ccri5 k o.wo )w97eqi+0jjpall of mass 100 g. The collision is elastic. What is the speed of each ball immediately aqpo+jo7je.rc09 ) iw5ac kiw6fter the collision?

A. -3.3 m/s and +6.7 m/s

B. +3.3 m/s and -6.7 m/s

C. -6.7 m/s and +3.3 m/s

D. +6.7 m/s and -3.3 m/s

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69#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

A ball of mass 400 g moving toward the east with a speed of 3.70 m/s cxd tiev :79ljb5yg1iku0 l2:eollides head-on with a 200 g ball li7g 29vd1ix u jk05b:t:ey elsitting at rest. The collision is perfectly elastic.
(a) Determine the velocity of the first ball after the collision.
(b) Determine the velocity of the second ball after the collision.
(c) Is kinetic energy conserved in this collision?

该题自我估分: (必填) (满分:1.0分)

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70#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 2.0-kg mass moves with a speed of 5.0 m/s. It collides head-on w 4zp; mbq.7vgqith a 3.0 kg mass at rest. If the collisiozqbvq;.p7mg4 n is perfectly inelastic, what is the speed of the masses after the collision?

A. 10 m/s

B. 2.5 m/s

C. 2.0 m/s

D. 0, since the collision is inelastic

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71#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 2.0-kg mass moving to the east j8q.agl 2 r+caat a speed of 4.0 m/s collides head-on in a perfectly inelastic collision with a stationary 2.0-kg mass. How much kinetic energy is lost during this collla.2j+r 8 qgcaision?

A. $16 \; J$

B. $4.0 \; J$

C. $8.0 \; J$

D. zero

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72#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A car of mass m, traveling 8vfe, vb9x8p 6ma f5it ku84n invlg-2with a velocity v, strikes a parked station wagon, who's mass is 2m. The bumpers lock together in this head-on inelastic collisi2 v,f f8g4tni 9pn6uavv8 -m8lkxb i5eon. What fraction of the initial kinetic energy is lost in this collision?

A. 1/2

B. 1/3

C. 1/4

D. 2/3

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73#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

A 15-g bullet traveling 213 m/s in a vertical direction buries itself in a 2.4-5db5(lf-qfk w h-tx 8ekg block of wood a rest directly above it. As a result, the bullet/block combination moves vertbk-xf5 lft85-eqwh( dically upward.
(a) Determine the velocity of the bullet/block combination at the point of impact.
(b) Determine the maximum height reached by the bullet/block combination.
(c) Is kinetic energy conserved in this collision?

该题自我估分: (必填) (满分:1.0分)

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74#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1500-kg car traveling at 90.0 km/h east collides with a 30 w2kw24c;2ksq c ks;fe00-kg car traveling at 60.0 km/h south. The two cars stick together after the cos2sc2 k4eq;kckw; 2wf llision. (See Fig. 7-1.) What is the speed of the cars after collision?

本题所包含的其它图片:

A. 8.33 m/s

B. 13.9 m/s

C. 17.4 m/s

D. 21.7 m/s

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75#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1500-kg car traveling at 90.0 km/h east collides with a 3000-kg car travelirk id86jql 5(jng at 60.0 km/h south. The two cars stick together a68ri5j(jq dlk fter the collision. (See Fig. 7-1.) What is the direction of motion of the cars after collision?

本题所包含的其它图片:

A. $36.9^{\circ}$ S of E

B. $36.9^{\circ}$ E of S

C. $53.1^{\circ}$ S of E

D. $53.1^{\circ}$ E of S

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76#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two objects move on a level frictib6yw*(syu6-gb/t svs onless surface. Object A moves east with a momentum of 24 kgm/s. Object B moves north with momentum 10 kgm-*(byb/tvwu gss 6ys6/s. They make a perfectly inelastic collision. What is the magnitude of their combined momentum after the collision?

A. 14 kgm/s

B. 26 kgm/s

C. 34 kgm/s

D. cannot be determined without knowing masses and velocities

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77#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A small bomb, of mass 10 kg, is tthz(89vo*d naxcx .4z764tqumiug5 moving toward the North with a velocity of 4.0 m/s. It explodes into three fragments: a 5.0-kgumn 4x84*xocvihdu gtt a(z9 .tz75q 6 fragment moving west with a speed of 8.0 m/s; a 4.0-kg fragment moving east with a speed of 10 m/s; and a third fragment with a mass of 1.0 kg. What is the velocity of the third fragment? (Neglect air friction.)

A. zero

B. 40 m/s north

C. 40 m/s south

D. none of the above

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78#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 4.00-kg mass sits a(+qtc* q y*imdt the origin, and a 10.0-kg mass sits at x = + 21.0 m. Where is the center of mass ont+c iqdm**(qy the x-axis?

A. +7.00 m

B. +10.5 m

C. +14.0 m

D. +15.0 m

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79#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The center of mass of a two-particle system is at the origin. One parj(kd;x( vf .fvticle is located at vj ( dx.ff(;vk(3.0 m, 0) and has a mass of 2.0 kg. What is the location of the second mass of 3.0 kg?

A. (-3.0 m, 0)

B. (-2.0 m, 0)

C. (2.0 m, 0)

D. (3.0 m, 0)

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80#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Three masses are positioned as follo+uzof*upl9tke hs4+8 ws: 2.0 kg at (0, 0), 2.0 kg at (2.0, 0), and 4.0 kg at (2.0, 1.0). Determine the coordinates of the centez9tf u+ksp+h 8u4oe *lr of mass.

A. (0.50, 1.5)

B. (1.5, 0.50)

C. (2.5, 1.5)

D. (2.5, 0.50)

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81#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Three masses, 1.0 kg, 2.0 kg, and 3.0 kg, are located at (0, 0), (1 j yx4k wpc 7ai3m6x;x68 ics);gfchn;.0 m, 1.0 m), and (2.0 m, -2.0 m), respectivelywsjaxch4 ;;3m kcxig8c6f7;)i xn yp6. What is the location of the center of mass of the system?

A. (1.3 m, 0.67 m)

B. (1.3 m, -0.67 m)

C. (-1.3 m, 0.67 m)

D. (-1.3 m, -0.67 m)

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82#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 3.0-kg mass is positioneoc9/0;e ytkeoa/-j xs8 d xpf,d at (0, 8.0), and a 1.0-kg mass is positioned at (12, 0). What are the coordinates of a 4.0-kg mass which will result in the center of mass of the system of three masses bf sy0ea;oo/tpx j9 ,d/e 8cxk-eing located at the origin, (0, 0)?

A. (-3.0, -6.0)

B. (-12, -8.0)

C. (3.0, 6.0)

D. (-6.0, -3.0)

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83#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Use Table 7-1 to calculate7te :xt7lihh3 7a0fkx the position of the CM of a whole leg including the foot when the leg is stretched straight out. Asi 3e : 07atkthx7hfl7xsume the person is 1.60 m tall.

本题所包含的其它图片:

A. 0.20 m above the bottom of the foot

B. 0.32 m above the bottom of the foot

C. 0.51 m above the bottom of the foot

D. 0.54 m above the bottom of the foot

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