97.01: A force F directed a 9 qmtwt,1j2tqt an angle of θ above the horizontal is used to pull a crate a distance D across a level floor. The work done by thttt1 9j2,wq mqe force F is

  97.33: A softball player c;4b ekjv9 zn* 6xnlvsp7qf-8jatches a ball of mass m, which is moving toward her with horizontal speed n*;n jf4vzxs9 j8 6-kp7vqblev. While bringing the ball to rest, 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 db3rl6jx 3q ;wa 20 kilogram sheet of wallboard 3 meter above the floor for 4 seconds. During these 4 sdjrq ;bw63xl 3econdshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slid84 b9)tf vyqy,izg)h pes with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energyh4 y )fy8,zqbpvg 9)it 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 a horizon/mh h;z8bjltrg cr. (.tal surfar tlz m;..(jhbhc8r/g ce for 5.00 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 righ+m; vq2w+b0xswjbru)t is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a horizontal susvw+)b2x0; rjqw + bumrface.
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 bloljf m42)zfb58cq a5 fqck for 5.0 s. The bqbjlc2affq4 8) z 5fm5lock was initially at rest and slides on a horizontal surface.
What is the kinetic energy associated with the block after the 5.0 interval?

  00.15: A student initially at restk8tp,x 2f ( lba7gvu3non a frictionless frozen pond throws a 1 kg hammer in one direction. After the throw, the hammer moves off in one x 2t8f7u a,gn3lbv p(kdirection while the student moves off in the other direction. Which of the following correctly describes the above situation?

  03.14: A fan blows the air and gives it kinetic energy. An hour after the t tb/nknpj)64fan has/6tb njp4nt )k been turned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0.50 kg has a position of 3.0 m,u03let1s3jng 7w)5pp :ab hrb a speed of 4.0 m/s, and an b b)phgsr:7 up0e5l31a3w njtacceleration of $1.0\; m/s^{2}$ . What is the kinetic energy (in Joules) at this instant?

  05.05: A box of old :2-fy413 k54cld ccm um wlgputextbooks is on the middle shelf in the bookroom 1.3 m from the 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.p4l: ul um21 c wc5dfm4yg-3ck

  02.32: An automobile engine delivers 24,000 watts (g2telmei*)r ;k p /m)labout 32 horsepower) of power to a car's driving wheels. If the car maintains a constant speed of 30 me li; ekp*/t)2)rlgm m/s (about 65 mph), what is the magnitude of the retarding force acting on the car?

  09.13: In the figure to the right, a box moves with speed 5.00 m/s at the both0b9. u.ycx 4.gfhtjqtom 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 9tq4 fbhg xc0..yuh.j reaches the 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 5.00 m/s at the omyn w3 (sva2kb3 h0k/sdup7t i(q1c 8bottom 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 = 2q87ktmho dy( pavs1sin33b0(k2uc w/40N. The box, 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, egnf7b i l;qv+,ach starting from rest, along a straight road. CarA has twice the accele,lfbivn; q+7 gration 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 force acting on the object durmv1m wa12uf0s,) rxfoing the time interval of the accr1,0 2uwxv)f1o msfma eleration?

  12.08: Through what dy8w1ybnq5+ar29vd . 8bp loej istance does the object move during the time interval of the aabv d q2j9ye1plwny+o8 .r8b 5cceleration

  12.19: The magnitude of the linear momentum of aui+waong :gngs57/ro r1 1 /zk 4.00 kg point mass is changed 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 energy of the mass during this time i7s / rnoz5gowuga1g rn+ /1ik:nterval?

  14.11: A crate gains 36.0 J of kinetic energy while its speed is increased /9ie- rq+yr j 7 a+a3d)onvudifrom 2.00m/s to 4.00m/s. Which one of the following choices best represents the mass of the crayaiu/ njo7v reiadd+ +r)3-q 9te

  94.38: A force F at an angle θ above the horizontal is used to pull a m yyf-p 5 ysgj:24 6 b3iel;2)hsgrykaheavy suitcase of weight mga distance d along a level floor at constant velocity. The coefficient of friction between the floor and the suitcase is μ. The kpye lgys;h 2-sba: 2ry 4)fj6i53y mgwork done by the frictional force is:

  14.31: A toy crane exerts9c:ym *v w5clkb .9b:key7z/ ji+poy q an upward force and delivers a useful power output of 0.10 w to ra e ck :k j7wv:/iob9.pbymzyqy9c +*l5ise a block vertically 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 ne0zw/ dtzu;x d4ar the surface of 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 choices best represents the amount of work done by the gravitational forc tzdwudz 4;x/0e 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 hardp/ a 7xg,hibg i5oh-+d floor and released. Assuming that the 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 surfi -ai/bd h5phx 7ogg+,ace?

  07.06: A 500-kg car is moving at 28 m/s. The driver sees a barrier aheadc(+pq) w qk5jj. If the car takes 95 meters to comekj) q+qj w5cp( to rest, what is the magnitude of the minimum average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows down uniformly ugw+1 tv .i2rzbb.)4zn:j prsz ntil it stops. If the ball travels 15 meters, what was the average net force applied while it was comi +r:.4grj.1szznptizbw)bv 2ng to a stop?

  02.26: Consider two laboratory cartdibwps..+lfop/* 7wbuv x, d 9s of different masses but identical kinetic energies and the three following statements. Which of the ai w/ +.x.7o,ppsdvdbl 9bf*uwbove 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 vertically in the air w5 ohci7z/ 7q2nv2kl koith an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its p/k iqo7n2lho 5kv7z2cotential energy when it reaches its highest point?

  06.20: A boy jumps from rest straight upward from a flat, sta( 893 s 0i ngjfr5:vvn o(xkaa2xn;cgvtionary concrete surface. The boy, of mass M, lev 8vs3n52 (9( cxi nxn:fga0rag vjo;kaves 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 boy?

  02.48: An object of mass M is dropped from aheix u/qqkx2 i 147xp7z*mp4zsj8zaen* ightH above the ground. The object crashes into some soft earth and comes to rest by compressing the earth a distance of H/2. Assuming that air resistance is negligible, what is the mqpm4x ske7ix87a *xuq4p2/j 1zi*zzn agnitude 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 ahdtc9xo2 h e9h3eight H above the ground. The object bounces 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 surfa3xeh9hd2to9c ce?

  96.38: A pendulum bob mass mon a cord length L is pulledhrz iko6:dx(6 sideways until the cord ma6ho6dzx(r:k i kes 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 o8kca50l jqc*ef 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 and momentarily comes to rest. The sled then slid qa klj5c0c*8ees 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 movs4,kngy 11 (*z6 ximn aiyse.des 10 cartons from the sidewalk, along a 10-meter ramp to a loading dok,izga1sxy nmi*e1(s4.dn6 y ck, which is 1.5 meters above 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) is applied for , o9yc-vcbgix ;emn0p9+)czkthe 6.0 meter motion of the box upward along the incli pe,)9y 9gzbc; xcvkco+ i0m-nne. 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 ballsed7gwvls3hw;1d+ er.6ygtw5pl+i c0 A and B are 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 arew s;ldw h.wiv6lypd0e53+e c g1g7t r+ the mechanical energies of the two balls changing?

  11.28: A person throws an object of mass M straight upwar15n1lq7:psu rl yh 3ilqk0vy 2d with an initial non-zero speed v. The object rises to a maximum height H above the launch point. The person now throws an object of mass 0.5M straight upward with initial speed 2v. In terms of H, to what maxi yhqi1 vy5lluk 3qr1s0pl2n7:mum height does the object of mass 0.5M rise above the launch point? Ignore air resistance.

  96.20: A force of 10 N stretches a spring that has a spring constant ofgt6dnp7r mr+1 20 N/m. The potential energy stored in the s 6td+1 gprrmn7pring is:

  97.10: A compressed spring has 16 J of potential energy. What is the maximum spe7t.qr)bdin3 led it can impart to a 2.0-kg n)tdrq.3 7 lbiobject ?

  

  10.31: An object of mass M starts from rest at the bo9kdy6f lyh2i9ttom of a fixed incline of height H. A person decides to push the object up the incline in one of two ways with99yhi6 d2 kyfl 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.