97.01: A force F directed at an angle of θ above the horizontal is used tstkyva ))o+z7o pull a crate a distance D across a l7okvsya +zt ))evel floor. The work done by the force F is

  97.33: A softball player catches a ball of mass m, which is movin4,w* hfucci2 ig toward her with 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*wc4i2c h,fui her hand is

  99.14: A construction laborer holds a )mb0yf2 +fotc 20 kilogram sheet of wallboard 3 meter above the floor for 4 seconds. During these 4 secondshow much power was expended on the wabotm y2+0cf)fllboard?

  17.11: A 5.00 kg block slides with uniform acceleration y)r/svi 2ef /+(ri zguon a horizontal surface forisze/fu+r2(y g/v)ir 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 wiec.g 3:jkl:wnth uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 J inlc3.wgj:kn :e 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 i. azvjj:zb+8 v(a;f gis exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and sliij bf:zv .a(zg8jva+;des 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 force directed to the right is exerted on a 3.0 kg blof5 s3/oa58.bmobcm f, 5uuj thck for 5.0 s. The b55c fu8oj3t bafos m.m/b5h ,ulock 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 reston a frictionless frozpcd 07,vd heiob)j9dk d./q+wen 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 following correctly describes the aboc 7 )h0ki vd jboqpw+dd/9e.,dve situation?

  03.14: A fan blows the air and gives it kinetic energy. An hour after thoyj r7:rvx8; ye fan has been tur:7 oj yx8vyr;rned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant az-4 -j3mar..b)nmkyg wb/yx , a block of mass 0.50 kg has a position of 3.0 m, a speed of 4.0 m/s, and an acceljn.-b x/a)ya bm 4zrg-kwmy3.eration of $1.0\; m/s^{2}$ . What is the kinetic energy (in Joules) at this instant?

  05.05: A box of old textbooks is on the middle shelf in the bookroom 1.3 m fyjf):hmx-kf2q u9l. 6i*qgkprom the floor. If the janitor relocates the box to the shelf that is 2.6 m from the6f.x2-qiu k k 9qglj h:f)pym* floor, how much work does he do on the box. The box has a mass of 10.0 kg.

  02.32: An automobile engi t6k kc+,ft9k)3fyifcne delivers 24,000 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 retardkky,6 3tf k)f+itfc9cing force acting on the car?

  09.13: In the figure to th:atfn0 2 c8fbhkk*4mxe 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 = n2f* xkc 8bfkt0am: 4h240N. 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 the botto1i;5awhemfvan* 0cc*m 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, of ;* a*i 5cc0fhewv1nmamass 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 strhnmwf1,s( t3l aight road. CarA has twice the acceleration of Car w1h ,lfn(3m tsB. 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 during t z+k5sf+f;u4 z02y8fhvykdow he time interval of the acceleration?z ;zv2h 04+uffkd y fks8y5+ow

  12.08: Through what distance does the object move during the time ini/sr4ry qnx+4gv n1-lterval of the acces-4qvnr ry lx4g1+i/n leration

  12.19: The magnitude of the linear momentum of a 4.00 ki097 cearw yd;g 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 thr0c9 yewd ;7aie mass during this time interval?

  14.11: A crate gains 36.0 J of kine;kg6 9xes0g a2c dv.dxz(w5pztic energy while its speed is increased from 2.00m/s to 4.00xga2x ep6dkzwd. 5c9;vzg( s0m/s. Which one of the following choices best represents the mass of the crate

  94.38: A force F at an angle θ above the horizontal is used toby gog4f2(g(g:i.asf 2o vfl+ pull a heavy suitcase of weight mga distance d along a level floor at constant velocity. The coefficient of friction between the floor and the suitcase(4vg 2af.bfi:fglog2ygo s +( is μ. The work done by the frictional force is:

  14.31: A toy crane exerpnmk5/v cl9 kc, ij/6kts an upward force and delivers a useful power output of 0.10 w to raise a cjnim l/p6kk95,k/vc 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 rwbs5 l(b6tjtw7s*na( yw :3czest 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 thzwjw s: ts3* ba7n(b tl65cwy(e 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 ha)ec;4xlprk* k0is9 5h/jtavx )me 2l wrd floor and released. Assuming that the collision with the floor is elastic, which one of the following graphskrcw2;) t4 5jax9hs*pl)/ilvmx 0kee 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 seb a0id, gp8 y3bzj;t.al zqw3,es a barrier ahead. If the car takes 95 meter q;0j3dga b 8 wlbyzpati,3z.,s 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 igr2r.9gt:j qty+wx /15 m/s slows down uniformly until it stops. If the ball travels 15 meters, what was the average net force applied wjx92yt .riwrgt q+:g /hile it was coming to a stop?

  02.26: Consider two laboratory carts of different masses but identical kinetic*c.;f*rde bq q energies and the threq ecq*fbd. ;*re following 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 vertically i5c i)qp0*oq0/mpy xktn the air with an initial speed of 4.60 m/s. Ignoring air resistance, what is the changtmx y)/0c5p*pk0qiqoe in its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straight upward from al +6c ub(vcqy- 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. How much physical work di-cu+6l qbv(y cd 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 ki m jpmwx8+tyt,, p,2dropped from aheightH above the ground. The object crashes into some soft earth 8wp pt ,+mktjymi, ,x2and 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 ahei jtai w.99m4mgght 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 igwaj 94m9mt.collision with the surface?

  96.38: A pendulum bob mass mon a /*mkwnf0 dqdp vh*t1.cord length L is pulled sideways until the cord makef/k tvdn*qh*.wmp1 0ds 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 slides10wb(a jt::xe5a bvrj80 lipa up a uniform incline of 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 m 01iw8: xlb a5ajbprvj(at e:0omentarily 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 cartons from the sidewalk, alon,p5up:/x sv0ri/mt - toxvwy:g a 10-meter ramp to a loading dock, whicu5/- x,:i:tw otyxsv vmrp/p0 h 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 the 6.0 m :l2)01k;kcsvbj d ezoeter motion of the 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?;e b:vk21)odjckz 0sl

  04.48: Two identical bowling balls A and B are each i5fuc8qds+ v4j-hy)n 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 mecy-q4fu)vhndj+ic s 58 hanical energies of the two balls changing?

  11.28: A person throws an object of mass M straight upward with an initial n;few5b1ie:d (*q, zmfo gwm2oon-z mwbz1: ,mofgfe5*2diw;oq (eero 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 launch point? Ignore air resistance.

  96.20: A force of 10 N stretches a spring that w mltz9olz1q:z0-j,,ynzq 5 thas a spring constant of 20 N/m. The potential energy stored in t nwql-t ,59q zl10y:mzzzoj, the spring is:

  97.10: A compressed spring has 16 J of potential energy.w q-h /dmm(qu 5((rl+i5ulhm ym49 igl32fby t What is the maximum speed it can impart to a 2r(9y wl2 (fb/ d(l itl4qq35mhmg5m um-+ihyu.0-kg object ?

  

  10.31: An object of mass M starts from rest at the bottom of a fixedlxfp5w+nxa/; w4 1ssn 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 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 tfslnp/ s1x;4+n5aw wxrials.