97.01: A force F directed at an angle of θ above thw9 u5h* 0 x,caiqjxzhvalu(8x*b. a/a e horizontal is used to pull a crate a distance D across a lav(h0w h*aliua9 qz./ xc au8 *bj,x5xevel floor. The work done by the force F is

  97.33: A softball player catches amu jm/2;2r si)euvssy7l(p/ r ball of mass m, which is moving toward her with horizontal speed v. While bringing the m2(js //li2rm;7s suyr)v ue pball 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 l5jmj*bnu 35h xaborer holds a 20 kilogram sheet of wallboard 3 meter above the floor for 4 seconds. During these 4 se 5 jnhuxmjb*35condshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform accelx78h2h2 hu ym+*hhup9y kje*teration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decrey h hxk27*ue8jthh9pmu*2 yh+ases 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 hoonygja6z l 34*b7j c4x+vevq .rizontal surface for 5.00 s. The block’s kinetic energy strictly decreases fro cjaovbevgz34x qy+.j n6*7l4m 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 forcehc4.ryk01 lbf/pu .cp directed to the right is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a horizontal surfack bp /0rpyu4f cch.1l.e.
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 exert7lvz9jk 7r3 op,*zxlmed on a 3.0 kg block for 5.0 s. The block was initially 9lpok z,7l3 m rz7*jxvat 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 reston a fh f z10v9hsme2u,go v*rictionless frozen pond throws a 1 kg hammer in one direction. Auv,h0vs 9efgo1 2mh *zfter the throw, the hammer moves off in one direction 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 kineti p f+cgj9-/xvkc energy. An hour after the fan has been turned offgc9/-p+ kfxvj ,
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, a spehaa4 w*lm +jv4epjf9 bk5h5b) k9e t(ied of 4.0 m/+ 4j) ah9 ivfkwbkptej a(em9h* bl554s, 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 o ulqour2; 4-bj 8b)(n3uohlocbn44cq n 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 - uo)lb(j3b ocun8c4l24q; ohnu q4brhas a mass of 10.0 kg.

  02.32: An automobile engine delivers 24,000 watts (about 32 horsepower) of powerg,65k dd7rhw o to a car's driving wheels. If the car maintains a constant speed of 30 m/s (about 6,dkg75 rh wdo65 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 th+o jd4 qq1vy(we bottom of a rough, fixed incl+dyqov qjw 4(1ined 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 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 tx/) asj5kx37 sg gc/uohe bottom k)/sgo ag/ 53s xj7uxcof 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, 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 bkah q3*u6tv-rest, along a straight road. CarA has twice the acceleration of Car B. After travea*6 q-tu 3hkbvling 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 forcpccet- )i5q ;:7za+3o,qj+lwb ut*hj ,wwn cie acting on the object during the time interval of the acceler*e jb+h5lu -7cc ct:3nzp +tqjw ;,a,oi) wwiqation?

  12.08: Through what distance does the object move during thegr(al a9fhgq8c2n :q / ehbi,3cq6/+br 5filw time interval of the e 8 /,hf359 gaqr / cbia2fcbnl+wq(qrgh:il6 acceleration

  12.19: The magnitude of the linear momentum of a 4.00 kg point mass is change2zg rwn,;.sk eugmv04 d from 6.00kg.m/s to 14.0kg.m/s in a time interval o;w2v4mg.enkzr, ug 0 sf 6.00 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 ite-y7vr ee -9 s,kod:hxs speed is increased from 2.00m/s to 4.00m/s. Which one of the followingo,rk9 h evx-y7es-d :e choices best represents the mass of the crate

  94.38: A force F at an angle θ e5*tsq;q kozx;z l c-qcl7,6e/k1jia above the horizontal is used to pull a heavy suitcase of weight7qoi ee c*,1 /k6zk lc5jq;x;alz stq- mga distance 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 delive,9 b tv: rtc6fiqw4e0wrs a useful power output of 0.10 w to raise a block vertically at a constant speed. At what constant speed will this crane raise a 0.20 kg bloccvwf 0t6:qte4 ,r w9bik?

  12.18: A 1.00 kg object is released from rest nea+j4 ur *z -q*-. 5fkhev5jgpxfq7obpmr 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 force acting on the Ear-pkm hq 7-vf j4be5ru*.5g+ fpjqxoz *th by the 1.00 kg object during the fall?

  96.18: A rubber ball is held motionless a height ho above a hard m ()d(bad+p/avrh-j l floor and released. Assuming that the collision with the floor is elastic, whv h(m p lj/()dda+ab-rich 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 drivet thueo 16dvn0)nut- 7r sees a barrier ahead. If the car takes 95 meters to come to rest, whatt6 -)1dtnn thu0ove7u is the magnitude of the minimum average net force necessary to stop?

  00.26: A 500-gram ball movif.m7keat rn e2 +.ed8iz+s* frng at 15 m/s slows down uniformly until it stops. If the ball travels 15 me2drn.e* m+s e ri8.kfz7ef+ta ters, what was the average net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of different masses but idn2ift umq;qs9m8d3bnn*y8,y entical kinetic energies and the three following statements. Which of the abon, q it;29s3yybnmf 8*m d8unqve 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 theaa2j-xzsp s9 2 air with an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potential energy whensp2z2a 9-a xjs it reaches its highest point?

  06.20: A boy jumps from rest straight upw+w(nm;jx 0+jant/b l xard from a flat, 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. Howj+ n/jbx awl nt;+0(mx 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 drt) ur62r9-ecqlntccs4vs (l, opped from aheightH 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 magnitude of the average constant f29,u(v-tslt)rrc cs lnq6c 4e orce 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.4r dj:loa:ni91 n+fe d 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 1:i + :ne rfdl4jdao9nduring the collision with the surface?

  96.38: A pendulum bob mass mon a cord length L is pulled sideways until yk: 7/n ls8fotthe cord:8yt/o ls kfn7 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 uni ghw4l(kn )9ovform incline of unknown angle. The sled, which started at t(o)hg wlkn4v9 he 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 original position at the bottom of the hill?

  06.09: A deliveryman moves 10 cartonyi-da,, /k1h kluh 7trs from the sidewalk, along a 10-meter ramp to a loading dock, 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 dockituhy/ l7,kadh -,1 kr?

  12.16: A constant force F=50N (as shown i v:5zuis h71yan the figure) is applied for the 6.0 meter motion of the box upward along the incline. The mass of the block is M=uv7a hs iyz5:115 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 from r *ijz3u4iwo79 do lk7aest from the top of a tall tower. Ball 9*uji 3da47i7okl ozwA 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 objp(6 421d+f1ta xznes7v ep jziect of mass M straight upward with an initial non-zero speed v. The object rises to a maximum height H above the laun zd7p xj2efp(i116tea+vs 4znch 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 launch point? Ignore air resistance.

  96.20: A force of 10 N stretches a spring that has a sprw z5ij70jjp 7iing constant of 20 N/m. The w57zp0ji7jji potential energy stored in the spring is:

  97.10: A compressed spring has 16 J of potential energy. What is the2.p sn0 hjpkv+fg fbc8u,-z(r maximum spe8 ,2nz-ps( .r fp0hu+jbvkfcged it can impart to a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at thgupi.7udys:*aou.e -yb,b 6re bottom of a fixed incline of height H. A person decides to push the object 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 d.a,u e7*o gpys-ru.uybb 6i: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.