97.01: A force F directed at an an5f+5cb f int+wgle of θ above the horizontal is used to pull+i cfnb5+ f5wt a 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 m2 a )nm -cr7iucs.nrx8ass m, which is moving toward her with horizontal speed v. While bringing the ball to rest,.um)2acnrsrxi8 c-7 n her hand moves back a distanced. Assuming constant deceleration, the horizontal force exerted on the ball by her hand is

  99.14: A constructiorv( xv5/queh+t ; ) vpdfrd2-gn laborer holds a 20 kilogram sheet of wallboard 3 meter above the floor for 4 seconds. During these 4 secondshow much power was expq5h(rtr x2;vg+vv-up ) d/e fdended on the wallboard?

  17.11: A 5.00 kg block slides with uniform acceleration on6kg8vja (j4s k a horizontal surface for sv jjakk48 6g(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 bw+,ss sks a:om/hf6t 9j5rv9 block slides with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decr9k6 sjhsb+ft rov95m/ :,wssaeases 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 kg block,3slmx3uxv7 u for 5.0 s. The block was initially at re s3xxvm7l u,3ust 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 exerted3mq-kiua u:sp*my4 b, on a 3.0 kg block for 5.0 s:3bm * qpak mu4,u-yis. The block 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 frozen pond th9v2jwhaz l4- crows a 1 kg hammer in one direction. After the throw, the hammer moves off in one direction while the studwa4clv j 9z-h2ent 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 -jho1/dl8l sl,x k75aquegn;kinetic energy. An hour after the fan has been turned off, ;/u1 7l j ,nl8 go-5qasdlhkex
what has happened to the kinetic energy of the air?

  09.05: At an instant,h4e50h jc kse.t.y g)p a block of mass 0.50 kg has a position of 3.0 m, a speed of 4.0 m/s,p ceh.g5thk. y j)s40e 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 on the middle shelf in theofk.0ny/i ejx bp3pg(vflu6,1 i/ l0u bookroom 1.3 m from the floor. If the janitor relocates the box to the sgl/ pe,xyknvou/j3 u lp(f bi.if1060helf 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.

  02.32: An automobile engine delivers 24, xde +cr7)q0ipaj *-adppi pwn5 kv///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 t*iap nwc+kd7q -e)r/p/0p ja/ ipvdx5he 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 atb;2+ n, fx ah8fmp7o;*0lzhiqa 6clja 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 o06hla+b7an jm; fz;p *o 2 l,hfxqia8cfF = 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 5.009d)5fhzkgea hk5 3jz pb9zb 16 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. fap6k1g5zkz5 hj39bbd )h9ze0 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 travell 0gmadc.008kuo ivy e1a7vo91csp : uw+p2xl to the right, each starting from rest, along a straight road. CarA has twice the acceleration of Car B. Aa a v9 ycov+21ukcesp . o0xug0d lpl70w18m:ifter 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 the whgjycq k(pt+ bsh r4g31+ )p7time interval of the accelerati gq h)p3+7w( 1+khyjt4brcsgpon?

  12.08: Through what distance dnyy*5x b*b ai2oti/o,oes the object move during the time interval of the acceleyi2y,n/5b*ax it*oob ration

  12.19: The magnitude of the linear momentum of a 4.00 kg point mlny4g0l1k;(p yx s8 gmy3feg) ass 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 g )epf04lyyxlgsy (31k; nm8gthis time interval?

  14.11: A crate gains 36.0 J of kinetic energy while its speed is in:xsv3:dg1** lbnemv lcreased from 2.00m/s to 4.00m/s. Which one of the following choices best ree13sbl:n l*vv*x m: gdpresents the mass of the crate

  94.38: A force F at an angle θ above the horizontal is used to pull a h q5tt(gm a(6zieavy suitcase of weight mga distance d along a level floor at constant velocity. The coeffita5gz6m t ((qicient 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 630:oknz a )bke*oaxp output of 0.10 w to raise xzpa*)no063:ko kb ea 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 near the surface of the Earth, ,bw5rfo, ks 7ble.g mfe06 7umthe 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 Earthwrs5bffu7 o 0el ke mbg,7m6,. by the 1.00 kg object during the fall?

  96.18: A rubber ball is held motionless a heigh+ zy jxg h8 id9a1 w,rlr3+;icn-ojb;at ho above a hard 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 i;aniyd+9jri3orl,x1wbc a h;- +8 jz gts height h above the surface?

  07.06: A 500-kg car is moving at 28 m/s. The driver sees hc*9 upq64 zlfa barrier ahead. If the car takes 95 meters to come to rest, what is the magnitude of the minimum average net forq6u4 9hf c*zplce necessary to stop?

  00.26: A 500-gram ball moving at 15 m/e 2qr8no 0ko8ss slows down uniformly until it stops. If the ball travels 15 meters, what was the average net forcrsq8 8o02 eonke applied while it was coming to a stop?

  02.26: Consider two laboratory carts of different masses but identical kinetshou9)h :g;u g/wa m-jr2 b.yaic energies and the three following statements. Which of the agmaa9. ws - ru hbho2g/y);uj:bove 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 (t :frzm-t239khr mn sis tossed vertically in the air with an initial speed of 4.60 m/s. Ignoring air resistance, what is thkrftm:t-h3 s9( 2rnzme change in its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straight upward from a flat, stationacbo,: xurx4 (:xiuji: ry 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 hi:rx: ijcx4xuo,iu( :bghest 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 aheightH above the ground.knz gjdhec :xtg*7 u6gdm9y/i:y11)p 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 c z:yd9*d1i7h g/jctmgp g)6 ykxe:n1u onstant force 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. The obb1w6u. 5rclgs0loky8u+w y q;ject bouncewwl1lo0uryu5+.;q sc8 gybk 6s 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 surface?

  96.38: A pendulum bob mass mon h556jyy -ogt ak2k,dpa cord length L is pulled sideways until the cord make6yahpk5to5,j - y k2dgs 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 uniforgzu)a7z*b* b fm 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 st7zzab* gf) *buarting 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 cartons from the sidewalk, along a 1044(u- vdupdnvrxqzl-ve)j / l2x,v6q-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 p6j v)- 2u vu-4zeqx/( dlqn4dvxr,l vthe loading dock?

  12.16: A constant force F=50N (as shown in the figure) is applied for -o,qcr biu(noqoab gyd26u5aud)92. the 6.0 meter motion of the box upward along the incline. The mass of the block is M=15 kg. Which one of the following choices gcy2 o9)d(a.buq5 or,6u n a-uobq i2dbest represents the work done by the force F onthe box for the motion?

  04.48: Two identical bowling balls A m8of71 ix6 kbp gx *)b(yxc:kipwto,4 and B are each dropped from rest from the top of a tall tower. Ball A is dropped one second before ball B. Afterfx*b k(bix7 m1 ,xy: oppw68ki)ot4gc 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 of mass M straight upward w7fg-nu1q .g mtith an initial non-zero speed v. The object rises to a maximum height H above the launch point. The71qtg -fu gnm. 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 spring constant of 0i kvx: ;4cpd5xkf:lc20 N/m. The potential energy sto: ccx5lp4:vxfdk k 0i;red in the spring is:

  97.10: A compressed spring has 16 J of potential energi2.1 cm.bv zia -dy.sg7mkh;zxg t-3 py. What is the maximum speed it can impart to a 2.0-kg o .1kg2i vd7xa t-pm-yz.c;h3si mz.g bbject ?

  

  10.31: An object of mass M starts from rest at the bot, n3 eq)da.-x l hmjt+7mf0ccgtom of a fixed incline of height H. A person decides to push the object up the inclinec 03ljqad)hfmg m.7+x -,tnce 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 trials.