97.01: A force F directed at an angle of θ above the hor .zm7q 4mzano3izontal is used to pull a crate a distancem4 a.n37o zzqm D across a level floor. The work done by the force F is

  97.33: A softball player catches a ball of mase71l ,s)7j :pa/gzepspp/(nhnmi 0 g ms m, which is moving toward her with horizontal speed v. While bringing the ball to rest, her hand moves back a distanced. Assuming constant deceleration, the horizontal foa m:e 7pp)1,sgnn i ez/lm0 p/pgj7s(hrce exerted on the ball by her hand is

  99.14: A construction laboy/ ivu 7*ya ykslf4n:vaov166 rer holds a 20 kilogram sheet of wallboard 3 meter above the floor for 4 seconds. During these 4 seco6 *7avo y aylvufvs6ki ny1:4/ndshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform acceleration on a horizonta cfi 3w+9;azvill;yd,g ;f1povgh38 xl surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0,v3c3f lygaio;i ;9x1vd +8zwpg;fl h 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 accej1vy3rt1i ; geleration on a horizontal surface for 5.00 s. T;j3ge1t yriv 1he 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 zya5w6eqeype5fx 9,6 kg block for 5.0 s.96e qp56wx yfae5 yez, The block 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 force directed to the right is exerted on a 3.0 kg bloc-pxc8sjwx6r a+ j dxg+88ly 1hk for 5.0 s. The block was initiall8 s1hcxw rg8+x+8dl-ajpyx 6jy 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 frozen pond throws a 1 cn 2a+rk 1sep3kg hammer in one direction. After the throw, the hammer moves off in one direction while asr1+n3 p2kecthe 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. w8vu6 .mjdma ol9,be:An hour after the fan has been mmv:.,u8a9 wdj l6beoturned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0.50 kg hagc pq6 lw,,4my+p,syxs a position of 3.0 m, a speed o6p c4mpw,yx y glq,s,+f 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 owndou v.:oy+ 7n 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 o+wn7.:dv oyu10.0 kg.

  02.32: An automobile engine delivers 24,000 w-i*praj4j;mz3h 8 tehatts (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 the cpa jh3mze;4 i-8htrj* ar?

  09.13: In the figure to the bux;p pvbx+ci3ni0k *)c6xc: right, a box moves with speed 5.00 m/s at the bottom of a rough, fixed inclined plane. The box slides with constant acce36pv ;b :* ci)cbkxp0xuc+nixleration 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,+ytbl.i9i1 pjd/aez ; 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 of F = 240N. The box, of mass m= 20.0 kg, has a speed of 2.50 m/swhen it reaches the top of t b9; y.ilj+tpz/eda i1he incline.
How much work is done by the applied force F to the box?

  11.30: Two cars travel to the right, ecp;gjdilz /3 f/83gd qach starting from rest, along a straight road. CarA has twice the acceleration of Car B. Afj3diq/l zcg3g8 f; pd/ter 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 ohjxb7q3l h8 4rjb :8wubject during the time interval of the :q4h b37w8hjrb8uxljacceleration?

  12.08: Through what distance does the object move during the ti e5l*ow4h 3ybeme interval of the acceyw4b ee3hl*5oleration

  12.19: The magnitude of the linear momentum of alaq7w gw)r-wau v9;b; 4.00 kg point mass is changed from 6.00kg.m/s toww- u;alwb v9 r);agq7 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 interval?

  14.11: A crate gains 36.0 J of kinetic energy while -3nvxgpe4 h/ mkwtsv2*;f-rdits speed is increased from 2.00m/s to 4.00m/s. Which one of the following choices best reprh -3r-m v;vg ekfpwsdtn 4x2*/esents the mass of the crate

  94.38: A force F at an angle θ above the horizon r+r9jp q.of9ztal is used to pull a heavy suitcase of weight mga distance d along a level floor at constant velocity. The coefficient of friction bet rzo.9f+rj 9qpween 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 outputloi u( :srr;u- of 0.10 roulis(: ;-ruw to raise 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 5w0rp mtrk 8)md l7cb/is released from rest 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 onc8r kt7d 5w0mm/)rlpb e of the following choices 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 above9 cw)a3lx0sz/(isot s a hard floor and released. Assuming that the collision with the floor is elastic, which one of the following graphs best shows the relationship between0lis(w9s3oz x) ta sc/ 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 sees a barrier aheac;0m +bml.uk dze,c5gd. If the car takes 95 meters to come to rest, what is the magni;5d gcum.l kz+mec,0btude of the minimum average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 mx p3hn5ik irdf:/u 0a5/s slows down uniformly until it stops. If the ball travels 15 meters, what was the average net force appl0kfr h3 api 55nx/iu:died while it was coming to a stop?

  02.26: Consider two laboratory carts of differenths3q;5a4,azavimm *-2 imooh masses but identical kinetic energies and the three following statements.i2;i*az h ,sqha3 vo5om4-a mm 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 6 ;yutyr(-m cdis tossed vertically in the air with an initial speed of 4.60 m/s. Ignoring amd6u(y t;c-yr ir resistance, what is the change in its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straight upward from a flat, wig2gc8cc2v3 5omh 3h 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 did the average normal force of contact (N) between the 2353hhg mgccc 2iow8 vboy’ s feet and the concrete do on the boy?

  02.48: An object of mass M is dropped from aheightH above the ground. 0 qe81* 7cyj s 9k)naf0ylvcgjThe 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 force exerted by the ground on the object while co*)gjfvqy8a cnc k 9ys17e0jl0ming to rest?

  12.48: An object of mass M is dropped from o;: n ptzklsu+9i*/ci 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 maximum height H/2. What was the magnitude of the aveusptk/+;n o9l :iic*z rage net force acting on the mass during the collision with the surface?

  96.38: A pendulum bob mass mon a cord length xp wws;3wb z+d( ar9u3;9tiefL is pulled sideways until the cord makes apfb93eu +9a;w;izwxw 3 d( strn 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. Tbk9 ;ift* y 5,zu0xy)xon jaz5he 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 poony5x5x fyka;,0z it9*z) bujsition 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 10f/8 tyjn2( uo.x(wkhb cartons 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 (/ (ny.28 xkbjtohwu fkg, 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 mus ep,b sfd4 q:jq:cfvlt., ,6eter motion of the box upward along the incline. Thefd,: 4b.jtf s,qqcl,esp:6vu 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 ba yz+ 8uhbs68zowling balls 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 s8uh sz8zyb6 a+trikes the ground, how are the mechanical energies of the two balls changing?

  11.28: A person throws an object of mass M straight upward with an initial noncv 8pt58qafm2-zero speed v. The object rises to a maximum height H above the launch point. The person now throws an object of8 tvm82 qfca5p 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 spring constantd7 j(prwh3k 88+vmh bo of 20 N/m. The potential energy st8b jdp whkrm73v8 +h(oored in the spring is:

  97.10: A compressed spring has 1:m*vgw),u 9ag7rvj ;8i fjse k6 J of potential energy. What is the maximum speed it can impart to a 2.0-kg obj9ugi amr*:7,s vegfkvj;w8 ) ject ?

  

  10.31: An object of mass M starts from rest at thezh2;,-i3 ; .0avviu : o e-kvvyykkagt 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 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 incli-: ;tiva,y;2a. kvu 03 gv-hokzy kveine and the object for both trials.