97.01: A force F directed at an angle of θ above the horizon/le o;6 ag1wob)gb7hftal is used to pull a crate a distance D across a level floor. The work done by the force F ihwbo)lb 6/oaeg;gf 71s

  97.33: A softball player catches a ball of mass m, which is moving toward herm*1ipi ; ar*jr fkazx2)* elr. with horizontal speed v. While bringing the ball to rest, her hanjr*.z1ak )am*li2i e ;r px*frd 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 wallboard 3 mepg ds)k1a tk 3*;t4bioter above the floor for 4 seconds. Duringbk ) dtgpi*a;ks4t1o 3 these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block k l-o 8 4x1lubnvv+a(s slides with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 s1u(+vv8 ko4al x- lbnJ 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 ooeq+76 nn ha, aljt6to*m dl*/n a horizontal surface for 5.00 s. The block’s kinetic energy str*t7hq6jaoo/lnl nt+da *,e6m ictly 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 ihh -j0 2ecb;efkyh.i q/:;cwis exerted on a 3.0 kg block for 5.0 s. The block waby-2ciw h/h;cj;e i.0k:h eqf s 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 o ss yh9lh3g2s3 q8gil640nsn cn a 3.0 kg block for 5.0 s. The block was initially at rehsni3nl g shl03c26y48s sgq9 st 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 res bs)q7l +jqipzem 3+8 eg5bb+qton 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 othe8bl) 53j7 qqpbmgq+ib e s++zer direction. Which of the following correctly describes the above situation?

  03.14: A fan blows the air and gives it kinetic energy. An hour aftef8-ikl;q fz5/ aks uv+pis;4rr the fan has been tffvia; sq;+srip4/z5klk- 8uurned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a bl.v k8n;jnfgvn/6q9 yg, sl.alock of mass 0.50 kg has a position of 3.0 m, a speed of 4.0 m/s, and an a6v lan/q . y g;fj.8,nlskgn9vcceleration 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 p2 prr3kxv+9cmiddle 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 work does he do on the box. The b v32c9+krxp prox has a mass of 10.0 kg.

  02.32: An automobile engine delivers 24,000 watts (aboutjge nuk;.bh/ - 32 horsepower) of power to a car's driving wheels. I/b-ukg;hjn e. f 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 wibjljzjh 8/cpb(9crt,9eq (,xth 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 pushjtq8,blc9jejbcr,( 9hp (x/ z ed 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 box moves with speed ;k7y)i hu+drlj 3cx7o 5.00 m/s at the bottom of a rough, fixed inclined plane. The box slides with consta;3rx hk) cido7j+lu 7ynt 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, eachh xl0jr*w;dllkp /efy(zfin+,w l907 starting from rest, along a straight road. CarA has twice the acw; d,/ h0z0lje9kl f*p7(lny fw+lri xceleration 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 ip s+njrwe fu,-9cu. hzy :10l(akqa8time interval of the acceler:skn e 9jc- (u+uzqr yapwl,8h 0i.fa1ation?

  12.08: Through what distance does the object mo l4kd3 m65a 3gplzgyq,v-myc *ve during the time interval of the acceleratip 6vgmdlyz33a4q k ymgc, *5l-on

  12.19: The magnitude of the linear momentum of a 4.00 kg point mass is chh pxmk z.1h+uo*4e a1janged 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 o.1h 41+ *a pmhzkojeuxf the mass during this time interval?

  14.11: A crate gains 36.0 J of kinetic energy a6w+a/qc(+j5-3qc mdbic xmlwhile its speed is increased from 2.00m/s to 4.00m/s. Which oqa36l +mcb+xw5cidm -c/ja ( qne of the following choices best represents the mass of the crate

  94.38: A force F at an angle θ above tyrc7+0 mm rc;3y1gywg- ct(f che horizontal is used to pull a heavy suitcase of weight mga distance d along a level floor at constant velocity. The coefficient of c7r1ymr -g3cyt 0 y;wc+g(mcffriction between the floor and the suitcase is μ. The work done by the frictional force is:

  14.31: A toy crane exerts ht1* qle pmr03an upward force and delivers a useful power output of 0.10 w to raise a block tq1* h0l3pme rvertically 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 near3bt 5*aymg1onv 8g7la xj5bvv,v80t n the surface of the Earth, the gravitational force acting on the ba0jyo51b7*tvmv8vtgna8l xg5 ,vn3 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?

  96.18: A rubber ball is held motionless a height ho aqy7 ke1ubxtfp-g, , wrj,55l8 tdt6z ubove a hard floor and released. Assuming that the collision with the floor is elastic, which one of the following graphs best shows the relationship1,q ebr 5utfzy,g 8xtu7lj65d ,-tkw p between the total energy E of the ball and its height h above the surface?

  07.06: A 500-kg car is m/i)gjmc;, 70ascq y ayoving at 28 m/s. The driver sees a barrier ahead. If the car takes 95 meters to come to rest, whatc)am caj,ys70qygi/; is the magnitude of the minimum average net force necessary to stop?

  00.26: A 500-gram ball usz5l8e bv ,p1xz*r.2/t u9nvofy7hb moving at 15 m/s slows down uniformly until it stops. If the ball travels 15 meters, what was the averaburz,p f vbo9hn1*27t/ve8zsl xu5.y ge net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of different masses but identizkk(o+qufpt(kj3 *21wy cb 4bcal kinetic energies and the three following statements. Which of tqck4 w*1j +okk (bz3u(bpty2fhe 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 an i26;z:p c lngy c 9u;rqn51pfa,akl(snnitial speed of 4.60 m/s. Ignorin,9 sacnz l6;f ;nr1 5uq(:npac2pgl kyg air resistance, what is the change in its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straight upwardxr(o;rd/b**u wveg 4xk6w nj0 from a flat, stationary 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 motion. How much physical work did the average normal force of contact (N) between the boy’ s feet and t0 xw(vg *6oxwd enu*r4j b;rk/he concrete do on the boy?

  02.48: An object of mass M is dropped from aheightH above the ground. The obj4x9(e .gjlg0 g )ff+t7hlit dnect crashes into some soft earth and ni )f7gf9h.edttlxjg g 0+4 (lcomes 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 object while coming to rest?

  12.48: An object of mass M is droppedlghr1e)x n092s,y pin8;nmli 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. What w0s),pyin9g 8mxnrle i ; 1hn2las 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 ya xfqi15i;r 1cord length L is pulled sideways until the cord makes a15 ii;r1yqxfan 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 unknown angle. The sled, whi mklozw 3 ld;h m,ko2zt(xv6)6ch 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 the2tk,mk zx ;z3o 6)lm(dh vlwo6 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 sidep(- 7 -*byrda f c-zkbyxztv96walk, along a 10-meter ramp to a loading dock, which is 1.5 meters ab(bbcz *z -6-97kayytfr xdvp-ove 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 for tvh.7apz v25wx he 6.0 meter motion of the box upward along the incline. The mass of the block is M=15 kg. Which one of zaw x2v7 5phv.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 0 .pyj/idf/ qmkqt11f fd : rv+x2zuw;7ro(oafrom rest from the top of a tall tower. Ballw pfr m: xoqi1dfu /ytaqj7 rv+fz.k/(102 ;do 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 upward with an initial nqr/mm- u ia ;qe2 +l9.mc0lfnhon-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 heq9qmn r2c.femm0i; hu - /a+llight 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 4jw,pt)ss mimlhc420spring constant of 20 N/m. The potential energim l0s4 j2mh4),pstw cy stored in the spring is:

  97.10: A compressed spring has 16 J of potential energy. What is the maximu1 -cjv/kpu:e ch 8s8bzk.lw2p m speed it can impart to a 2.0-k2 kp8 ljcep/w1.v8s h:z cu-bkg object ?

  

  10.31: An object of mass M starts from rest at zne+t g;f;kfhgl8 ) v;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 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.l8;fg;ng )v+ eftzh;k