97.01: A force F directed at an angle of θ above the horizontal kqoe (/5zt 0iois used to pull a crate a distance D across a level floeto(5 o/0 qzkior. The work done by the force F is

  97.33: A softball pla06 *p kfmuk)aa1x eia)tk9 h:xyer catches a ball of mass m, which is moving toward her with horizontal speed v. While bringing the ball to rest, her hand moves back a distat1himk9kaxe6xpa kau 0:f )*)nced. Assuming constant deceleration, the horizontal force exerted on the ball by her hand is

  99.14: A construction laborer holds a 20 kilogram s1 0gjv9gj 4ua2f,jushheet of wallboard 3 meter above the floor for 4 seconds. During these 4 secondshow much power was expended on thj ag1uv,924jj fshg0ue wallboard?

  17.11: A 5.00 kg block slides 2 ukryo/9q nl./(buw0ky5tvvwith 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 iyl2 /95ry/tkq0nv.u( bo kw uvn this time.
What is the average speed of the block during the motion described?

  17.12: A 5.00 kg block sli7y iy(hbk p16ndes with uniform acceleration on a horizontal surface for 5.0y1k(6i ynb7 hp0 s. The 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 tosc ,7x*c; j-pp3k3+r8uvmjz ttz4mye the right is exerted on a 3.0 kg block for 5.0 s. The block was initiallyz8c-y +vptk3; ru 37jczxmtjemsp4 *, 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 righ6jt baj9y,2 zut is exerted on a 3.0 kg block for 5.0 s. The block was inizy a j9j26,tubtially 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 thr1.1rd ccrr01t6m jp6 2gkypk zows a 1 kg hammer in one direction. Afz0j .6rp 6krcr11p yd2g1tm kcter 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 kinetic energy. An hour after tho (du x o;bg8:/y.mkqo xj0:ffch.a-ne fan has q .n ck;.x dgm:boo0-/uao: hf x(yjf8been 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 a posp 0 abzq3;bnqvfj zqcbkq /n9)d33*a:ition of 3.0 m, a speed of 4 ;3d9pz0qq)vbc3j/a k*q:3fnaqnzbb .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 on the middle shelf in the bookroom 1.3 m wkey186nqf *m from the floor. If the 61fqw8mk y*ne 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 10.0 kg.

  02.32: An automobile engine delivers 24,000 kp+mroi5eyj8t.m bx ( sh95t22iiud2watts (about 32 horsepower) of power to a car's driving (. 52rud5tj pxok9b8m+yhsm 2iie2it 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 car?

  09.13: In the figure to the right, a box moves with *eu02kp(xmpu speed 5.00 m/s at the bottom of a rough, fixed inclined plane. The box slides with constant accelek*ue(2ux pp0m ration 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 b8k20pybua ri; .r f3d;(mmxhjox moves with speed 5.00 m/s at the bottom of a rough, fixed inclined plane. The box slidempyaxuh 8r3jd; r0;ibf(2 .mk s 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 ,dj.mdwwm z :9 8edkt*the right, each starting from 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 speed in terms of B?de*t,d km.mz d:wj9w8

  12.07: What is the net force acting on the object during the timh u;6c/f0 auaoe interval of the 0f6uaco u;ha /acceleration?

  12.08: Through what distancmsuisby8 *546b s nhw)e does the object move during the time interval of the acceleratiomwy8)6* 4bnssish5u b n

  12.19: The magnitude of the linear f89 bw4cznl *smomentum of a 4.00 kg 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 thf*z sw4l8c9bne mass during this time interval?

  14.11: A crate gains 36.0 J of kinetic energy while its speed is increase iivlt9w6(53 huqd uc o)bu)w7d from 2.00m/s to 4.00m/s. Which one of57u t6 vq)blu3wuh(d ci 9)owi the following choices best represents the mass of the crate

  94.38: A force F at an angle θ above t s/owa6zn 5zq8he horizontal is used to pull a heavy suitcase of weight mga disz8/5 wq6noa zstance 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 exertsp3b2rka+rm; b an upward force and delivers a useful power output of 0.10 w to raise a block vertb;m pra2rbk+3ically at a constant speed. At what constant speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object ise qbba rp0(; g:uof51s 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 theuqpe :bf5 g(ros1;b0a ground, which one 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 mot*mqj 9 1p5ve skl/0pv+.quc s(zjv4ae ionless a height 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*+e.1k ua mv4p j9l5v0j qce(s vq/spz 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 q p9r2d:6fvc4iako3zahead. If the car takes 95 meters to come to rest, what is th: vik 6pcfzro2 9q3da4e magnitude of the minimum average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows dow um6psr3ll2:5 pnrvu lr8 or0)n uniformly until it stops. If the ball travels 15 meters, what was the average net force applied whlr ru:5r ur8s 3)vplm60 2olpnile it was coming to a stop?

  02.26: Consider two laboratoryuzhsm+6f -qr7// i1g yjg wlmxc +7f-g carts of different masses but identical kinetic energies and the three following -uj/ygf fgq7-z lcrim g1+ mw6s h+x7/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 cc .;f0 h6e ebv3w :lggstu6)yblay is tossed vertically in the air with an initial speed of 4.60 m/s.gb6c6tg: 3ee sylwbvhu. );f0 Ignoring air 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, stationary concrete qapk1+ b ghu: 20bzx2xsurface. The boy, of mass M, leaves the quba1hx2 02gxp+b:kz 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 boy’ s feet and the concrete do on the boy?

  02.48: An object of mass M is dropped from ahein3k t0y3g /waightH 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 0g y/anti33kw 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 fromn/ vjxn:+ofc( 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 a j/n:no+v(fc xverage net force acting on the mass during the collision with the surface?

  96.38: A pendulum bob mass mon a cord length L is pulled so*q3d1q8yh:mn wa1f qideways until the cord makes an angle q:mq* dyqnaw1 3 18foh
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 incl- fv8e s)+voxmt an7(qine 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 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 hv8-+exsa nfv7()tqom ill?

  06.09: A deliveryman moves 10 cartons frome/mwq 96, aguw)0h 1kuvj.yt,f(hv d y the sidewalk, along a 10-meter ramp to a loading dock, wh9g, uq6thha,/v. w( )yj 0ekyvuwfd1m ich 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 fic y t3svs3bjlo,dkcq q2+*u+(gure) is applied for 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 dkv3quoqs( t3++scc, jl *2yb 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 rest frooxu.i w (df;3fe uax:9m 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 mechanical energies of the two balls changin(3wfiuoxdx: 9 .;eu fag?

  11.28: A person throws an object of mass M straight upward with anai1dfkjm k--yd7k1:mgc/nl 0c,)g)hao so7 e initial non-zero speed v. The object rises to a maximak/mkk g-mc7) 0oj1)lh-idg7nsa o,:ydec f1um 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 has 4mppkrg;0i w*rp,l g e26 jxnn)yu;)ra spring constant of 20 N/m. The potential energy stored wpilpr624xmr kgr;e ) j n);guy0p,*n in the spring is:

  97.10: A compressed spring has 16 J of potentiale8w:b tljaom2c dz79 x4 8h+xo energy. What is the maximum speed it can impd84o ojcw8t9h z+ 72m:xlxbae art to a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the bottom of a fixed incline of-- t-2bgzgi dpag0(zsi+ l;mz 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 gsgig 0z2 d- ipb-l+t(z-zma; object for both trials.