97.01: A force F directed a6(e1hh7w.ut6 t 2 usk7+us w 4aksthsrt an angle of θ above the horizontal is used to pull a crate a distance D across a level floor.rt76uk ts6(4ah usuk2sw7thhw+ se 1. The work done by the force F is

  97.33: A softball player zp i-bkxq+r )+catches a ball of mass m, which is moving toward her with horizontal speed v. While bringing the ball to rest, her hanxik+z q)+-br pd 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 wallb 5gtjy8fi- 5bcoard 3 meter above the floor for 4 seconds. During these 4 secondshow much power was expended on the wallboardi -tc5bj f8y5g?

  17.11: A 5.00 kg block slides with uniformd4 eygi.)lrhht ,75i 7zkbmgs705 okg acceleration on a horizontal surface f7 tem)7lgbh 47,gi kg k5ydirhs.z 50oor 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 bx*8c0sh0/yzlr/, i b+m dsqno lock slides with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic enexc0l/ 8r0 ,biyh/ zms+sndq*o rgy 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 directew- n) (tq vbmx4z)izl7hp8m 2pd to the right is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on -b l v4 itxpq )np)h2zmm(8w7za 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 block folckp,ek7r-9m r 5.0 s. The block was initially at rest andr-e,lp7 kmkc 9 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 res.; 6ley0j1slf(f.qpqz3 3h dn7jue v lton a frictionless frozen pond throws a 1 kg hammer in one direction. After the throw, the hammer moves off in o j ;sll.zphde 3lj6q y30qvff (u1n7.ene 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. A 7v( dg7sm nsh);r3ajrikla8g4 n. vv:n hour after the fan ha;7s8l7:( g 3rvkjnh.vs vi)gm 4arnd as been 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 positionz2:ro1m.- w p jb9buro,ei5-z khcbu- of 3.0 m, a speed of 4.0 m/s, arr59,oj -ucb be.bkzi p:hw2m-u1z-o nd 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 oj v; wrnfd20(fn the middle shelf in the bookroom 1.3 m from the floor. If the janitor relocate2f;f r(d vw0jns 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 d fl:+wazx, (9mt sto;8anx8w,4yi djm elivers 24,000 watts (about 32 horsepower) of power to a car's driving wheels. If the car maintains a constant speed of 30 m/s (about(8l: 4o;xa+t9w8j diws,t,xnmyz ma f 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 speed 5.00 m/s at z22gh flwauk /- nq4:ms2 cpw1the 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 aup4nw2g-mh l 21z/ 2s :kwqfca 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 to7 fg6zi qp-tpvdlyfz v-0nct;3r23 )s the right, a box moves with speed 5.00 m/s at the bottom of a rough, fixed inclined plane. The box slides tpvs 7if26z-pl0 dg-n rcv 33;zyq ft)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 the right, each starting from rest, -ml 0p.nicz3yalong 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 tr3.nliyp0c -zmaveled the same distance F, what is its speed in terms of B?

  12.07: What is the net force acting on the object during ggge da 0veld ;3 exl058o-fw(the time interval of the acceleration? v o85xdgf0a-;(leeg elg0wd 3

  12.08: Through what distance doee n7bpu5ifcv(c025.l vwv f+ws the object move during the time interval of the a5nfl v p 2ivf.0+bc5ewvwcu( 7cceleration

  12.19: The magnitude of the linear momentuz esy;q(+5s 3yhiwiw ,m of a 4.00 kg point mass is changed from 6.00kg.m/s to 14.0kg.m/s in a tii(;ysqhwe3 i+ 5ywz,sme 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 kineml/8ye ef 295aqu/oxktic energy while its speed is increased from 2.02 m qoky//xf9ul 5e8ea0m/s to 4.00m/s. Which one of the following choices best represents the mass of the crate

  94.38: A force F at an angle θ above the horizontal is (x;0 h s24xdwga- k3hhptrp5lused to pull a heavy suitcase of wep3xhhlk2xs h0wga d-t 4; pr5(ight 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 r 5zqszmj*,e6 force and delivers a useful power output of 0.10 w 6*e j m5s,zqzrto 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 is released from rest near the surface of theh 8idq7-jt*qk 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 choiceqti*khqd 7j8 -s 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 e* kmj8.g a8bga height ho above a hard floor and released. Assumia 8gme *bj8k.gng 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. The driver sees a barrier ahead. If thad9sfoe,ic*w p//b: he car takes 95 meters to come to rest, what is the magnitude of the minimum average net force ,wih:p bf/od/ca *e9snecessary to stop?

  00.26: A 500-gram balh5w htx b8f* .9ipd3iv y*5,f+*arrrscty bm,l moving at 15 m/s slows down uniformly until it stops. If the ball t *f85*i xp.ttbrcrdf h59a+hy3yim s,wr,v*bravels 15 meters, what was the average net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of diffe skqta:w r57r2*7rq2f apoz4zrent masses but identical kinetic energies and the three following statements. orq5 7zatrs:2 4w*krza fpq72 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 is tossed vertically in the air with anu8isikj8p2*y p/,6cfa 5s ok gv2uf8 g initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potential ene6g,ukfgppiu 82j sf28vkoay/si 58c*rgy when it reaches its highest point?

  06.20: A boy jumps from rest straight upward from a flat, stationary concr3*/0fw+1gkr +q z gang3: gog wryhr0oete surface. The boy, of mass M, leaves the concrete surface r rgwa0*:hzfor3gg+k/+gw 3g1 noyq 0with 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 il0+ tq9w-zhcis dropped from aheightH 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 of the average constant force exerted by the ground on the obje 9itzql-wh+0cct while coming to rest?

  12.48: An object of mass M is dropped from aheight H above the ground. pt42 y4gs0hztqia( kiyc(5 f1The 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 average net force acting on the mass during kt1z5gsa(h iipq 0f4(t 4yc2y the collision with the surface?

  96.38: A pendulum bob mass mon a cord length L is pulled s8ep9y qf( w 6s+(lvjslideways until the cord makesq pslvwy+ e9lsf6 8(j( 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 uniform incline of unkn:o26ovl9 8vc hn-:r;atnlq pk fc3b4town 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 po ofo:6ltkav ;lcv b24n8: hrc q-pn93tsition 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 1re6uqhe oc4 /(0 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 d4 h ceruo/eq(6eliveryman on the cartons to move them to the loading dock?

  12.16: A constant force F=50N (as shown 58.fevm5ffow in the figure) is applied for the 6.0 meter motion of the vf m8.f5wf oe5box upward along the incline. The 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 bowling balls A and B are each dropped from rest fryheoq cq6va-(n- b k+1om the top of a tall c e6 a+n (h-q1bqokyv-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 changing?

  11.28: A person throws an object of mass M straight upu3+ f:khdv o /ck. qh)72faahpward with an initial non-zero speed v. The object rioa)q. 2 f3/7acd:pfh uhv+kkh ses 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 launch point? Ignore air resistance.

  96.20: A force of 10 N stretches a sprmgob n-lc i23661zkzaing that has a spring constant of 20 N/m. The potential energy stored in the sp 2gzl m ziba16k3cno-6ring is:

  97.10: A compressed spring has 16 J of potential energy. What is the pg sb* krrlz-(-) xfp)maximum speed it can imp) grz-bkfprsp) x-*l (art to a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at tho7cb7w0yopgqfmg e;-m2zs1 * e bottom of a fixed incline of height H. A person decides to push the oyo-7 mm2g ez0 p7gw;b1sfq *ocbject 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 object for both trials.