97.01: A force F directed at an angle of θ above the horizontal is 0n rd1is.gxcycw*v-, used to pull a crate a distance D across a level floor. The work done b-y vr01dgwx,cci. * sny the force F is

  97.33: A softball player catches a ball of mass m, which is moving toward hetimg cgpp2m3zl 5s)+ ,r 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 herm+lpz,)cm3gp5sgt 2i hand is

  99.14: A construction laborer holds a 20 kilogram sheet of ;(thmcy z,dm7 wallboard 3 meter above the floor fz,7dyh; (tmc mor 4 seconds. During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform acceleration on a ho(j-w- 76e la9lvq t1xta ooc0prizontal surface for 5.00 s. The -l6to1a -9vqx0wje7lc( p atoblock’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 uniform acceleration on a horizontaujvh5/q1rf s 9l surface for 5.00 s. The block’s kinetic energy fq s/v91h jr5ustrictly 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 ew*kk nplqnnxq(w8. /6xerted on a 3.0 kg block for 5.0 nwn 6kk*l/p8wx qq. (ns. 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 3.0oi)vppg98ac8;hk( iv,igh i/ kg block for 5.0 s. The block was iniv vi,h hp)c ai8k9/ i8g(;iogptially 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 initia . nb 0v2juj+v++i 9mah/hlajro4az-ally at reston a frictionless frozen 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 b-/l hjaahr j0 j.2 auv i9oa++4+zvmnthe above situation?

  03.14: A fan blows the air and gives itxyoxo x(o6 qc55:od**iavt py0sd,h+ kinetic energy. An hour after the fan has been turo+:yxqt * dxdp(*iochsoaxy50 v 5,6o ned 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 position of 3.0 m, cdo x69upq-r rd9 7:t uz;0pbwa speed of 4.0 m/s, and an acceleration :rpc rq u -bud0;x9oz9t6pdw7of $1.0\; m/s^{2}$ . What is the kinetic energy (in Joules) at this instant?

  05.05: A box of old texv* +k* cq*+.,jh t7iqjmx cbff lzc7m/tbooks is on 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 work7, .xikftlqj m mzcj**q+cb +/ 7v*hfc does he do on the box. The box has a mass of 10.0 kg.

  02.32: An automobile engine delivers 24,000 :fdj qzn;,ef wsvph 101,*qni 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 1, vdp*w efh 1;zsj:nni,fq q0the retarding force acting on the car?

  09.13: In the figure to the right, a box moves with speed 5.0d:3aozg s,s wht*uxtup/- b.5 0 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 the incline.s5*wz-:b3hx utsoup/ .d,agt
What is the magnitude of the acceleration of the box as it slides up the incline?

  09.14: In the figure to the right, j8ui; :huf b*1y ;f qm- sed5zly7e1x iw2c9iua box moves with speed 5.00 m/s at the bottom of a rough, fixed inclined plane. The box slides with constant acceleration to wl 5s1ih-uxbejz9iuif u;y2ey* m8q7f 1 ;:dcthe 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 the right, each starting from rest, along a sty9mkkm,(fl b)sy8 fm lbb70+nraight road. CarA has twice tk lb ,b(mbmfnlf 87s90)kymy +he 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?

  12.07: What is the net force acting on the object during the time ivnw cvx2+qwje ( e ;xcj+czn+ o:0,pp0nterval of the acc w zqx+ceevj2,0p (o+:;cpcv+jx0 nnweleration?

  12.08: Through what diki we2b2f0e- txskc 56stance does the object move during the time interval of th26tc 0wfkxs5e i k-2bee acceleration

  12.19: The magnitude9mzmla(*b g .r of the linear momentum of a 4.00 kg point mass is changed from 6.00kg.m/s to 14.0kg.m/s in a time interval of bar(mzgl*.m 96.00 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 its s*n)2:5 fzg a*hhusjhwpeed is increased from 2.00m/s to 4.00m/s. Which one of tnhwhzgf :a)5*hs ju*2he following choices best represents the mass of the crate

  94.38: A force F at an angle θ above the horizontal is uszf rndd+b+ cjfv++ *1ued to pull a heavy suitrdc+b1*f n++duzv f j+case of weight mga distance 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 exerts an upward force and 84k) u0et bce8rs2wmw delivers a useful power output of 0.10 w to raise a block verti )e 0wurmkt8 2c8ebws4cally 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 t4zokx;0pg i ;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 mto4 ;oiz0gt;xpk 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?

  96.18: A rubber ball is held motionless0cjt7o a3:h4u ) nqeuy a height ho above a hard floor and releaey4n0hq cot73u)a: jused. 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 its height h above the surface?

  07.06: A 500-kg car is moving at 28 m/s. Th5l+4/d(0 sp 6o4u e6ppoo eexsi 2zlwjav mf-)e driver sees a barrier ahead. If the car takes 95 meters to come to rest, what is the magnitude of the minimum average net force necessary/zx6 pi)d2o oof- e4aeuv wp560 m+ssp (jll4e to stop?

  00.26: A 500-gram ball moving at 15 m/s slzyk,3qt z)eb 0w 33ulvqa:bc /ows down uniformly until it stops. If the ball travelsq :/y ,b0cz3uwqte3k l a3v)zb 15 meters, what was the average net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of diffle o;f uge**w5erent masses but identical kinetic energies and the three following statements. Which of the above s f *oeule*;g5wtatements 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 in the air with an i6 ep4novwinkad 9x3r (u)c,+oq9.t arac96 ohnitial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potential energy when it reache xc)oo6tnprduq94hr n,ao69ec9w aav.k i3+ (s its highest point?

  06.20: A boy jumps from rest straight upward from a flat, s-yrukgp6726pn,;z tb cmk n1a tationary 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 moti kky;16p zu7r-tbmc6nnap ,g2 on. 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 , w1a )zyt(qji ,fijg;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 resisf1,j( a;)j yzi, tgiqwtance 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 dropps27 -rm 8v)gqd-wxeleed from 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. lr2e8q)-ed w g -xmsv7What 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 a cord lew5 :otq ,mk )an.+;jiue *pzl 9jmklq,ngth L is pulled sideways until the cord makes an a,ai*k5ujllp+.eqozjtmqm;nk 9 ,:) wngle
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. The sled, w gsz/ch5pb ot; -9bbk6hich 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 bottobh 56o/ktpzc-9gbb;s m of the hill?

  06.09: A deliverymanh-8 u +xc+ ziuvdt:6hk moves 10 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 kg, what is the total work done by the deliveryman on the cartons to move th8zivct hh-+uk+ dxu: 6em to the loading dock?

  12.16: A constant force F=500hs3unz8go9 cted:/h7 r mam.N (as shown in the figure) 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 followog .t3snhc/8:mhrd 790eum a zing choices best represents the work done by the force F onthe box for the motion?

  04.48: Two identical bowling balls A and B aruwoi3g5x 5fj9 fhs2o ,e 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 ba25,wj ofu 9fxgs io35hll A strikes the ground, how are the mechanical energies of the two balls changing?

  11.28: A person throws an object1t8/g tddv;ii of mass M straight 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 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 laung t 8t1idvi/;dch point? Ignore air resistance.

  96.20: A force of 10 N stretches a spring that.locj0ov lq49sg.p b+ has a spring constant of 20 N/m. The potential energy stored in tcl9o4j l v+gbos..pq0 he spring is:

  97.10: A compressed spring has 16 J of potential energ, j-:yxzhdhqjs*l57;d xj/am y. What is the maximum speed*dh jszh md- xl5ya j7/jq:;x, it can impart to a 2.0-kg object ?

  

  10.31: An object of mass M sta3ff( 4nexg.f krts from rest at the 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 g4(f.f fn3kxe 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.