97.01: A force F directed at an angle of θ above the horizontal i 7bimi t-xn2kejt3x; +s used to pull a crate a 7 2bx3+-t;tm nj exiikdistance D across a level floor. The work done by the force F is

  97.33: A softball player catches a ball of mass m, which is moving toward ).0exu3j i fduig igf9 *v ca0mo1)r.nher with horizontal speed v. While bringing the ball tojggri .mn i1eda0iof fv3c0)ux*u9.) 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 laborer holds a 20 kilogram sheet of wa*9n :xqv hxl/sllboard 3 meter above the floor for 4 seconds. During these 4 secondshow much power was ex 9: xhvqxl/n*spended on the wallboard?

  17.11: A 5.00 kg block slides with uniform acceleration on a horizontal ss/.* mx kz .:g-bdqykyud/-k g.qykmzs*b y :.xrface for 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 with 1db , )f1sv. tsbpphy; uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy stri)s.psdb p1 fy 1bht,v;ctly 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 kg bloclzss h(0p ye*+k6ct;qk for 5.0 s. The block was initially at rest and slides on a hori*s+y;z6 cqlkt0e p (shzontal surface.
What is the speed of the block at the end of the 5.0 interval?

  16.12: A 12.0 N net force dqh;*(a1emor3e n m7x girected 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 x g1erq;(anhm *m7e3osurface.
What is the kinetic energy associated with the block after the 5.0 interval?

  00.15: A student initially at reston a frictionless f-lvne 8mk.b a7turulla-f ,,1pkb:.trozen 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 directionetb8r.fv- l ulp.:t,k1m-nua, k7b a l. Which of the following correctly describes the above situation?

  03.14: A fan blows the air and giveanvidi al123 9s it kinetic energy. An hour after the fan has been turned la vnai3d 9i12off,
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 spk9tt0ggkv c(2ily*9 teed of 4.0 m/s, and an aclt9y2ikk0ggt( v *t9cceleration 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 shj l2xf1tp:ajp (q t0zjh 2s0.felf in the bookroom 1.3 m from the floor. If the janitor relocates the box to the shelf that fsq(tpaph:jf. 0x20 12lzj jt 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 wv*a )az9bw7 1niwchyg8x 8haq3zg+ , watts (about 32 horsepower) of power to a car's driving wheels. If the car maintains a constant speed of 30 +cb,)qw9a*81 iw8ygw z3n7 ahx zvahg m/s (about 65 mph), what is the magnitude of the retarding force acting on the car?

  09.13: In the figure to the righ/v np+ kjrao90t, 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 = 240N. The box, of mass m= 20.0 kg, has a speed of 2.50 m/swhen it reaches the top of thv aojnk+0 p9r/e 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 mo 3.5kx/np aohyxs s*h1ves 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 theho*.xa x k 3n/phy15ss 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 startin;bdkrkbk w,+: g from rest, along a straight road. CarA has twice the acceleration of Car B. Aftr+ kb,;kb:wdker 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 tin8yz4 ebbg90 mme interval of the accelerb4 nym b08ge9zation?

  12.08: Through what distance does the object move during the time i 13qy/tl.ifj,1dtqds nterval of the acceify3jq tt1,dqd /l 1.sleration

  12.19: The magnitude of the linearu sv;s8 )p*apjqg0id+xh,(sm momentum of a 4.00 kg point mass is changed from 6.00kg.m/ss(v0 )hqd x, mpa;si*jsg +8pu 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 this time interval?

  14.11: A crate gains 36.0 J of kinetic lqffr (x(1ud4k nx.r(r+fyieb7o*6 w energy while its speed is increased from 2.00m/s to 4.00m/s. Which one of the foll r(yrfk4uiql*wfx 7d(r(n .b1o6 fex+ owing choices best represents the mass of the crate

  94.38: A force F at an angle θ above the4m +,sa5tizzl horizontal is used to pull a heavy suitcase of weight mga distance d along a level floor at constant velocity. The coefficient of frial4 5tsmziz +,ction between the floor and the suitcase is μ. The work done by the frictional force is:

  14.31: A toy crane exerts anfe;ujw/ 9upqi 4ksu4bg +/-xn upward force and delivers a useful power output of 0.10 w to raise a block vertically at a constant speed. At what constant spee +np sw-/kuq;fxeu4g9iub4/j d will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is rev92h,.gcgq g j3k 5yg47mal(uws:c gt leased 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 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?j(q5cwkl7yg gta.2m3, :9g suvgg4hc

  96.18: A rubber ball is held motionless a height ho above a hard floor aukawq.fh2 z vq sx(0*/nd released. Assuming that the collision with the floor is /2v f.q*ah0q uxk(swzelastic, which 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 drivx(yvm,kq3 hy+er sees a barrier ahead. If the car takes 95 meters to come to rest, what is the magnitude oy ,yxh(+k 3vqmf the minimum average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slo m k9hks2dc25jdj :x+qk.4hgpws down uniformly until it stops. If the ball travels 15 meters, whhq k9hgx24 kpmkj. d: cd+j5s2at was the average net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts dvi: aq *;o ) n8da*cw6mzx*xaof different masses but identical kinetic energies and the three following statements. Which of the above statements would be w *aaz 86nvo* dqc):m;x* iadxcorrect?
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 0*fmz2 kdlo (ix9k .zp9pa/ tqyj7:dmthe air with an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potential energy when it reaches its highest poin9yifl.p2jzq mazx:pk0tmd 9*do7( k/t?

  06.20: A boy jumps from rest straightqk576aloe );e 9c tuoi upward from a flat, stationary concrete surface. The boy, of m)5eleio u7cqok;a t69 ass 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 boy’ s feet and the concrete do on the boy?

  02.48: An object of mass M is dropped from aheightH above the ground. The objetr3o6 +9lm qctct crashes into some soft earth and comes to rest by compressing the earth a distance of H/2. Assuming that air resistance is negligible, whato m369qcl+tt r 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 ahe5fa o.wpei , qt+;tfhm co-/ w 5vgw3t+jc2)zsight 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- t /tc i5wzoo)f52fmh+qcj,3eg+wtp;avws. the average net force acting on the mass during the collision with the surface?

  96.38: A pendulum bob mass mon a cord length L is pul39 rdk y1mow)rv ng17yled sideways until the cord makes an angleov wyykrn 7)rg31d9m1
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 slides9zgl )5kxy /hi 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 st h)/5k g9ilyzxarting 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, .m ,1qiruqz fm p(m55balong a 10-meter ramp to a loading dock, which is 1.5 meters a1 u.5mp r,5m m(zqqibfbove 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 fortf +:/1rkgvpgj0 n p4v the 6.0 meter motion of the box upward along the incline. The mass of the block is M=15 kg.npt :r+gvpj/v1g fk4 0 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 b .4)in;,vn siaoktyj6alls 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 strikes the ground, how are the mechanical energies of the two balls changivynj4 a.ini,tsk;6 o)ng?

  11.28: A person throws an object of mass M straie13fqril8xv ;e+uh lzu+)r ;dght upward with an initial non-zero speed v. The object rises to a maximum height H above the launch point. The person now throws an oxur qe fziv;e;3uhr8 )+l+l1d bject 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 s 8uo6nr+k)vmm pring that has a spring constant of 20 N/m. Tho )uk+ 68rmvmne potential energy stored in the spring is:

  97.10: A compressed spring has 16 J of potential energyi a.)lz2 7(vpecb0a o2-mydlc. What is the maximum speed it c v7)a2. c-ple0dz2ybm(aiolc an impart to a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the bottom of a fixed 3g2lpy t*rb(u gyrk2 ,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 r2(2,r ybtgykg *lu3p 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.