97.01: A force F directed at an angle of θ above the horizontal is used5 wjwv1m)ol wcje((;y to pull )wy; mj(5 l wec1wj(voa crate a distance D across a level floor. The work done by the force F is

  97.33: A softball player catches a ball of mass m, wh 4mk7vpt)8y2,vpe hwhich is moving toward her wi h)8kpm74ew pvv2hy,tth horizontal speed v. 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 labddlha;707 tdisd0yf/0 fayn8orer holds a 20 kilogram sheet of wallboard 3 meter above the floor for 4 seconds. During thesa tsd7n fiy 0f; dydd0l0h78/ae 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform acceleration on a horizontal suj)+0xtvk1f-ypi(m:6 sgz kk jn 9vpm)rface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 J in this tin-xk:jkvjyv 1ik9)psmpt6fgm )+ (0 z me.
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 horizontal sunjo kv 9*+oi-7 ahs-uurface for 5.00 s. The block’s kk un-i-oju* o+9havs7inetic 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 kgvksp4ux /f9 +*4tlx aj block for 5.0 s. The block 4/ax*4 x ustjpk v9lf+was initially at rest and slides on a horizontal surface.
What is the speed of the block at the end of the 5.0 interval?

  16.12: A 12.0 N net force6 w ea l9yg2qre/,qp.w directed to the right is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest any2 9e6wa,lq rg. qwp/ed 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 reston a frictiw0 v2e;mxw1zce3 yy s;+g4y qconless 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 direction1;w02qy y4zexy3m egvcsw c;+ . Which of the following correctly describes the above situation?

  03.14: A fan blows the air and gives it ki7np2: sky1xly netic energy. An hour after the fan hyln1xksyp7: 2 as 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 v y0mz2 zsui(a- 62frva position of 3.0 m, a speed of 4.0 my2zsf rvm2z0v(- ai6 u/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 ;e(m rsc mq. *glkdd e68i 12vwodzytk*11p6iis 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 8 s k 1ekep* 21.dmi (ymtg;v dz6qw6rio1d*clof 10.0 kg.

  02.32: An automobile engine delivers 24,000 watts (w n ,tx za7agofc 3qv (*u+9ie25h3ydoabout 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 mdqo oet *3w9cuf7 3aiyzgvn a2hx (,5+agnitude of the retarding force acting on the car?

  09.13: In the figure toxe56+am6nzlgek -0 p x the right, a box moves 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 speezp -k0a lmx5 g6xe6+end of 2.50 m/swhen it 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 .fsbj c8 4b4lzto the right, a box moves 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 blf8cb j.s z44with a constant force of F = 240N. 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, each starting fro)e uim8ox.6 ocm rest, along a straight road. CarA has twice the acceleration 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 8 .)oo6cx meuispeed in terms of B?

  12.07: What is the ne6;6+vc )wc.j pjvai uz7p*cl4qulb ,t t force acting on the object during the time interval of the acceleration?vczl.c v*+pcu46ai w pj)bt67, jqul;

  12.08: Through what distance does the object move during the time intelhoe2* zw(0nzrval of the acce2 0wlhz(ne*zo leration

  12.19: The magnitude of the linear momentum of a 4.00 kg po25hohr pw8hek-b3 k,uint mass is changed from 6.00kg.m/s to 14.0kg.m/s in a time interval of 6.0wu hr2h e5kb8hk- ,3po0 s. What is the change in the kinetic energy of the mass during this time interval?

  14.11: A crate gains 36.0 J of kinetic energy while its speed is inc.t f zpozh0t wk2wp2l p6*o9.ireased from 2.00m/s to 4.00m/s. Which one of the following choices best represents the mass of .i0w.*oloz6pf ttpph zw2 92kthe crate

  94.38: A force F at a88*5 q kxmyb8mk tdcy(n angle θ above the horizontal is used to pull a heavy suitcase of weight mga dis*cby kk8 x5q(d8mm yt8tance d along a level floor at constant velocity. The 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 useful power out7 hbeqp 78wv0yput of 0.10 w to raise a block vertically at a constant speed. At what constant speed will this crane raise a 0.20 v8wp7 0 yqeb7hkg block?

  12.18: A 1.00 kg object is released from resbqkd nxbo-w4cv;5. u1wf rmwi,;x7i6t near 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 am56n7;viofbw dxcm;xr4q-wb,w.i u1k ount 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 abovjk0)sfk.8urw )t4eoge a hard floor and released. Assuming that the collision with the floor is elastic, which one of the follreg8s. jf)kut k0o)4w owing 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 o:4dwaviv fus)0+v o .nfu93em/s. The driver sees a barrier ahead. If the car ta vnv3s0uwfe:io4)d9 of+vu .akes 95 meters to come 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 until it m5 /yo 1hp.s2av4ll1krvfr .crut07 vstops. If tv1hc. k7f 5l 0ov s14rvrty/a.pl2mruhe ball travels 15 meters, what was the average net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of different masses but identical kinet j+ow9 ta p,7hix sqnp6g7r,y7ic energies and the three following statements. Which of the above statemqpnp 7 7syox,a9g7,t 6hiw+ rjents 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 claunk n1(t +okel :.1yaeq4c as9y is tossed vertically in the air with an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potential energy when yakqt19sl:.14neo au ( n e+ckit reaches its highest point?

  06.20: A boy jumps from rest straight upward from a flat,h4ek7:v h5rh5: ufg7u pspa m. stationary 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 physvhp pre7: kam:ugfs hu55h4 .7ical 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 aheightH above th-eu/g7 /d x*v0i/ldkpozg m5we 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 negligibg-/ dgv0x7 dl*euzpmwk / i/5ole, 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 d7,q+l a4i lr6bczn3fdropped from aheight 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 7dli 6 r+n bcqfzla3,4maximum 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 a cord length L i h.y6* /g(sjd5nh6r9wm ybut qs pulled sideways until the cord w tdu66smh9rg*y/by 5jqnh. (makes 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 of unknown angle.z 17gp7b bt:h.o-h ye;b,zwin 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 slides back down the hill. What is the sled's speed when it returns to its or.t o,p;e7bg: zh1b b-ih7 ywnziginal position at the bottom of the hill?

  06.09: A deliveryman moves 10 cartons from the sidewalk, along a 10-m )eyk:+-y74kx1q r3kz mv f6istsz:de eter ramp to a loading dock, which is 1.5 meters above thq y3rstk16z f :s)y4:i z-+m7kkvedex e 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 00z ro5d8 ne6 l7purszthe figure) is applied for the 6.0 meter motion of th zd5rsrpue8 nl06 7o0ze box 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 are each dropped fromulrd /ucf1p2(9h *kd ;bfi8qj rest from the top (dck 8;uq r/lf*2dh9f1ipu bjof 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 mechanical energies of the two balls changing?

  11.28: A person throws an object j;gmmoi l1d4euh09g 0 w.p9s :(to5umi6igoh of mass M straight upward 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 maximum height does the object of mass 0.5M rise above the oi0 oe;l( h.md4 ogsji g9m6u1p:htw9 0mug 5ilaunch point? Ignore air resistance.

  96.20: A force of 10 N stretches a spring k) yhw r)/7xyvthat has a spring constant of 20 N/m. The potential energ)7k v h)yx/rwyy stored in the spring is:

  97.10: A compressed spring has wmk;k7 lx p7) jotsl59vq8(ht16 J of potential energy. What is the maximum speed it can imparthkv)9s8opxkmlwt7qtl5;j (7 to a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the bottom of a fixed m+vuy 8xkdn+-:0 zl lcincline of height H. A person decides to push the object up the incline in one of two ways with an applied fo-l 0:++xz n8kyuclm vdrce 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.