97.01: A force F directed at an angle of θ above the horizon9cm m miq bm-/n;5ne5j5vpq9ztal is used to pull a crate a distance D eqmmn9i5m;-c 5jv/nz 9bp qm5across a level floor. The work done by the force F is

  97.33: A softball player catc;3 n.5qrrsjy:0xj 8agy8 vk unhes a ball of mass m, which is moving toward her with horizontal speed v. While bringing the ball to q8 r:jr ;yk 08ya x.nvsu5j3ngrest, her hand moves back a distanced. Assuming constant deceleration, the horizontal force exerted on the ball by her hand is

  99.14: A construction laborer holds a 20 kilogram sabcea1 cr0 s;czl8 :je,;fre .heet of wallboard 3 meter above the floor for 4 seconds. During these 4 secondshow mufr8c;c1.;be 0ae,:jcaszl e r ch power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform 2+j + nr)8jpzo:q0i5tl pclrqacceleration on a horizontal sur8c+ tlqorp 25lzq pjir0n+j :)face for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 J in this time.
What is the average speed of the block during the motion described?

  17.12: A 5.00 kg block slides with uniform acceleration on-wmhi 49mb1w3*mrddb a horizontal surface for 5.dmm*r bm w34 i9-whd1b00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 J in this time.
Which one of the following choices best represents the magnitude of the block’s acceleration during the motion described?

  16.11: A 12.0 N net force directed to the right is exerted on a 3.0 kg block2 ok4meh 13ck5+kb grk for 5.0 s. The block was initially at rest and slides on a horizontal surface3 e5+o 2 kkh4c1brgkkm.
What is the speed of the block at the end of the 5.0 interval?

  16.12: A 12.0 N net force directed to the right is exerted on a 3.0 kg block1c)h8lp ns*p(o qjp,;*antil for 5.0 s. The block was initially at rest and slides on a horizontah*p1plpj,8anq n)sl ict; (*ol surface.
What is the kinetic energy associated with the block after the 5.0 interval?

  00.15: A student initially at reston a frictionless7p8yr ;npm w*vd)i ::j p5;jnrhr-hlw frozen pond throws a 1 kg hammer in one direction. After the throw, the hammer moves off in one direction while the student moves off in the other direction. Which of the followm pnyi*hlp5rrnd j8; r;hw-) p v::j7wing correctly describes the above situation?

  03.14: A fan blows the air and gives icyoje2glgy+;5 04dg iw nt:*yt kinetic energy. An hour after the fan has been5y y*gg;:w0 nlg+d4 ic2ejyo t turned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0ou t9lqpm: *bvd)k1h;.50 kg has a position of 3.0 m, a speed of vhotq*bd ;k u:m9p1l)4.0 m/s, and an acceleration of $1.0\; m/s^{2}$ . What is the kinetic energy (in Joules) at this instant?

  05.05: A box of old textbooks is ozt tq832z8amsno/ bwmi oz+84n the middle shelf in the bookroom 1.3 m from thm ti8qbtozn3+awm2zzo488s/e floor. If the janitor relocates the box to the shelf that is 2.6 m from the floor, how much work does he do on the box. The box has a mass of 10.0 kg.

  02.32: An automobile engine delivers 24twhc)f*cq xy05 0 mef0,000 watts (about 32 horsepower) of power to a car's driving wheels. If the car maintains a constant speed of 30 m/s (about 65 mph), what is the magnitude of the retarding force acting on th0 )0mfh qey*w5ft0cxc e car?

  09.13: In the figure to the right, a box mov;m*fihzg6 : 9x srwyx,es with speed 5.00 m/s at the bottom of a rough, fixed inclined plane. The box slides with constant acceleration to the top of the incline as it is being pushed directly to the left with a constant force ofF = 240N. The box, of mass m= 20.0 kg, has a speed of 2.50 m/swhen it reaches t6 iw,mg: 9xfszyxr *;hhe top of the incline.
What is the magnitude of the acceleration of the box as it slides up the incline?

  09.14: In the figure to the right, a box moves with speed 5.b+2sy g yt 7f9u4gzi5v00 m/s at the bottom of a rough, fixed inclined plane. The box slides with constant acceleration to the top of the incline as it is being pushed directly to the left with a constant force of F = 240N. The box,y 5ts42ggv fi9u yb+7z of mass m= 20.0 kg, has a speed of 2.50 m/swhen it reaches the top of the incline.
How much work is done by the applied force F to the box?

  11.30: Two cars travel to the right, each starting from rest, along a s k:tof 99yp fiul5 k-o5zw*qf,traight road. CarA has twice the accek9i:o ,tyfqkzofluf9*wp5-5leration of Car B. After traveling a distance F, Car A has speed B. When Car B has traveled the same distance F, what is its speed in terms of B?

  12.07: What is the net fovo-cig4kip2pknp ;t 5j; oo-5rce acting on the object during the time interval of the ak k;opvo4j i-no 5pc;gt5ip -2cceleration?

  12.08: Through what distd v jb;fl(p f36:gjaq-l 9t(xtance does the object move during the time interval of the accelerat6p9v(jtxff 3g-:l; td (lqa jbion

  12.19: The magnitude of the linear momentum of a 4.00 kg point mass is chang, v8pnj: s4 a6uxd 9ysw vrsxbync256ax+pe/,ed from 6.00kg.m/s to 14.0kg.m/s in a time interval of 6.00 s. What is the change in the kinetic enebc6s v 2 p6dx5j 8+/yn,wexvs:y p 4uxn,arsa9rgy of the mass during this time interval?

  14.11: A crate gains 36.0 J of kinetic energy )nw ; i8mhkw dbvi,,+-+b hhoywhile its speed is increased from 2.00m/s to 4.00m/s. Which one of the following choices best represents the mass of the crat by+ wihk+8;dhi,m w-b,h n)voe

  94.38: A force F at an angle θ above the horizontal is uzitdh0udz gd /(wa2.*sed to pull a heavy suitcase of weight mga distance d along a level floor at constant velocity. Td z/hwd(g*dz2 ut .ia0he coefficient of friction between the floor and the suitcase is μ. The work done by the frictional force is:

  14.31: A toy crane exerts an upward force and delivers a us,5ejip*iwi z+cg ga,iu *+( vyeful power output of 0.10 w to raise a block verticvi(+ze*+y*5gi, auipj cwg i,ally at a constant speed. At what constant speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is released from rest near the surface o6u a ibg6:-5omob,qmgf the Earth, the gravitational force acting on the 1.00 kg object by the Earth does 10.0 J of work on the object as it falls 1.00 mto the ground, which one of the following choic5 oma,gu ig6 6:-bmoqbes best represents the amount of work done by the gravitational force acting on the Earth by the 1.00 kg object during the fall?

  96.18: A rubber ball is held motionless a height ho above a hard floor and ree3p*g(sll 3 i) je*xwfy2v5qk leased. Assuming that the (ve3gsk) l*p *exyi5qfw23lj collision with the floor is elastic, which one of the following graphs best shows the relationship between the total energy E of the ball and its height h above the surface?

  07.06: A 500-kg car is moving at 28 m/s. The driver seejzn: ro4c+c1es a barrier ahead. If the car takes 95 meters to come to rest, what is the mcrec1j+o4n: zagnitude of the minimum average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows down uniforml gvvdey.u3 q hxy-)sc5-t4d6qy until it stops. If the ball travels 15 meters, what was the average net force applied while it was codd3-5 .vv xy)ct sqhqu-6gy4eming to a stop?

  02.26: Consider two laboratory carts of different masses but identical kin5f (bchxsh,-*qia )wretic energies and the three followin(,a5h hwqb-*fcs rx)i g statements. Which of the above statements would be correct?
I. The one with the greatest mass has the greatest momentum
II. The same impulse was required to accelerate each cart from rest III. Both can do the same amount of work as they come to a stop

  06.19: A 60.0-kgball of clay is tossed vertioc-bvn e(2e+k++p3df htnoi 5cally in the air with an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potential-5vo3ne cibtpd + +ekhn(f2+o energy when it reaches its highest point?

  06.20: A boy jumps from rest straight upward from a flat, station8u- ya c ev.r36, pfyj:xe1ce4prwva ,ary concrete surface. The boy, of mass M, leaves the concrete surface with speed v and his center of mass rises a distance d to the highest point of the motion. How much physical work did the average normal force of contact (N) between the boy’ s feet and the concrete do on the boyyvwvcyj4c-ppf, . ,1e e8aur:3xr6a e ?

  02.48: An object of mass M is dropp6;/b w(wolvdled from aheightH above the ground. The object crashes into some bv(/dllow ;6 wsoft earth and comes to rest by compressing the earth a distance of H/2. Assuming that air resistance is negligible, what is the magnitude of the average constant force exerted by the ground on the object while coming to rest?

  12.48: An object of mass M is dropped from aheight H above the ground. The objzcza z,ls; *0eect bounc;c*e0lsa zzz, es off of a horizontal surface in a collision lasting time T. The object then rises upward to a maximum height H/2. What was the magnitude of the average net force acting on the mass during the collision with the surface?

  96.38: A pendulum bob mass mon ,avyu05kd. gn a cord length L is pulled sideways until the cord man d,.5uvak yg0kes an angle
θ with the vertical as shown in the figure to the right. The change in potential energy of the bob during the displacement is:

  03.49: A sled slides up a uniform incline t gp oe-nd0;r-nd)pyw :-(jkkof unknown angle. The sled, which started at the bottom of the incline moving at 10.0 m/s, rises to a height of 3.30 m above its starting position ; gye-wd-rj ont-pnk)(:dk0 pand momentarily comes to rest. The sled then slides back down the hill. What is the sled's speed when it returns to its original position at the bottom of the hill?

  06.09: A deliveryman moves 10 cart z7:nn.k1a;w uv5ifnaons from the sidewalk, along a 10-meter ramp to a loading dock, which is 1.5 meters wn 5auv7;n.zkfna:1iabove the sidewalk. If each carton has a mass of 25 kg, what is the total work done by the deliveryman on the cartons to move them to the loading dock?

  12.16: A constant force F=50N (as shown in the figure) i5ojl8w2cuqm5mu0 w1 r4ci cs9s applied for the 6.0 meter motion of the bomiu2osclrm1j4 50wc 58 u9c wqx upward along the incline. The mass of the block is M=15 kg. Which one of the following choices best represents the work done by the force F onthe box for the motion?

  04.48: Two identical bowling balls A and B adm gtr.m)4 1c9 y5ji )wg3ltemre each dropped from rest from the top of a tall tower. Ball A is dropped one second before ball B. After ball B is dropped but before ball A strikes the ground, how are the mechanic g5g14delwct)i3t m mmj9).yral energies of the two balls changing?

  11.28: A person throws an object of mass M straight upward wi-f ;lrxx1e)ksp 1ts1e th an initial non-zero speed v. The object rises to a maximum height H above the launch point.f repl1 kx1xsse;-1 t) The person now throws an object of mass 0.5M straight upward with initial speed 2v. In terms of H, to what maximum height does the object of mass 0.5M rise above the launch point? Ignore air resistance.

  96.20: A force of 10 N stretch(s - krj:z)hrg lx:w0ves a spring that has a spring constant of 20 N/m. The potential energy stored :kjhzr0v:) -r slgxw(in the spring is:

  97.10: A compressed spring has 16 J of potential energy. What is th5x48e*4wohwa icd:l:si- z bke maximum speed it can impart tah:-: 8c5zox dkiw*sw4 i4bl eo a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the bottom of a fixed in ,0iznmec7jev sd36+z cline of height H. A person decides to push the objen+6v0 m7cj3i,dzee s zct up the incline in one of two ways with an applied force shown in the diagram. In each of the trials, the object reaches the top of the incline with speed V. How would the work done by the person on the block compare for the two trials? Assume the same constant non- zero coefficient of kinetic friction between the incline and the object for both trials.