97.01: A force F directed at ani7zp/b7txg p/ angle of θ above the horizontal is used to pull a crate a distance/pb gi x7t/z7p 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 to4nhot8 hd xr+h1*y4 dlward her with horizontal speed v. While bringing t*1x l h +4nhdto8d4ryhhe ball to 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 w2 t o7+ sjd5y;ylq5nrballboard 3 meter above the floor for 4 seconds.loty75bd 2y;q j+ 5rns During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block sli gi+9sc(t byr7o8*3ozj*vmsi des with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from t3*j(m7os + s gcr8zivi*ybo9 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 horizon ybs-ts83uy 4ytal surface for ys4b8s-yt 3u y5.00 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 ford qsc,g3ed4x( 80sam oce directed 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 hori3c(4q ox8mdsde g0,sa zontal 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 gt m0nto hgc:l1js :8x3p; 3,d+tatt dv b9l5hthe right is exerted on a 3.0 kg block for 5.0 s. The vchx8d3p5t 9s a:m3 o0jngt,1;htgllt+d: t bblock was initially 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 initiall,scu 8)jkgnkd, m( 1vb(u4v +vwmcc nn(u;q2ly at reston a frictionless frozen pond throws a 1 kg hammer in one direction. After the throw, th +l(2nq,v)mnu1v8vkc 4(gmjc ukub( w;ns,cd e 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 houpqux1l3ty92 ex 5,i fxi:v fr;zpry5)r after the fan has been turned3 y,9i ; ytrlfux)1pvz2xxip:r5q ef5 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, a speewf-qvzf0r rugzj:o y dd/,8n(,((y nud of 4.0 m/s, and an accelerati(,znqw-uvry gu / ,:(f(d0dj8ofrynz on of $1.0\; m/s^{2}$ . What is the kinetic energy (in Joules) at this instant?

  05.05: A box of old textbooks is nmkpz(d5e)9 mon 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 9men5dz)mk p( 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 engine6 *dot- 3zjeer/qutg, delivers 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 65 mph), what is the magnitude of the retarding fortzgqd 3eto *e6j/r, u-ce acting on the car?

  09.13: In the figure to th*muc pmrp7*75gxg g 1ce right, 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 p ug*gcpp5*g 77mr1x mcushed 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 5)vm9gyl11m w1sj7g fm.00 m/s at the bottom of a rough, fixed inclined plane. The box slides with cv79)1sj mf11ym wlmg gonstant 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 frbs af+d o8dmls2l1r0, om rest, along a straight road. CarA has twice the acceleration of Car B. After travdfsm oldal2r ,b08s+1 eling 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 w/0/x0w ohi20-: ob ffqapwi aduring the time interval of the accelerap2 bw/0w0o0 ifi:axfw/ohq-a tion?

  12.08: Through what distance does thei+vslf6 g: h shjzc1s0+)s,vl object move during the time interval of the j+s h:isz )vvf,sl+c160hgslacceleration

  12.19: The magnitude of the lira r myz6.f u9eq83xfvo8- 5xanear 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 6.00 s. What is the c.m6aarfe oxz-38y xqu f95v8r hange in the kinetic energy of the mass during this time interval?

  14.11: A crate gains 36.0 J of duywkgs3/d 0b3xrnn2 c3j +y4 kinetic energy while its speed is increased from 2.00m/s to 4.00m/rg+x b2wkj /n 3u0dc33snyy4 ds. 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 used tt criae48 zj05o pull a heavy suitcase 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 fct r80ze 5ji4arictional force is:

  14.31: A toy crane exerts an upward nfnja:;95bu gforce and delivers a useful power output of 0.10 w to raise a block vertically at a constantuag:;5fb 9jnn 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 surfaz dnzgfv (4fxnw1t..*ce 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 mtg 4wz*xzt.1f n. v(ndfo 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 above a hard floor ande 1n(*s0bngkr released. 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 sukb(*rsng1e n0 rface?

  07.06: A 500-kg car is moving at 28 m/s. Th ;l yv ,x)e4cj ua3jumlkfsjv2() q9f.e driver sees a barrier ahead. If the car takes 95 kyas9(ljvu2)u,4jl3 fm.jf v )qce;x meters to come to rest, what is the magnitude of the minimum average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows down8swoui; 2chyi ) dqlx7pj 2*1z uniformly until it stops. If the ball travels 15 meters, what was the average net force applied while it was coming to a is iyu2h*)x cpjlqdw182 z7;ostop?

  02.26: Consider two laboratory carts of different masses but identicjjf.yh qr:/v (al kinetic energies and the three following statements. Which of the above s/ hyqjvj. f(r:tatements 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 initi2wx5ut.cz.h 2 ne u)pxal speed of 4.60 m/s. Ignoring air resistance, what is the cp5cwenz.xt 2)2uxu h .hange in its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straight upward frow,yzd0. .hgo2 0ztxoo5)r.c kqkoe3g m a flat, stationary concrete surface. The boy, of mass M, leavexg2y o0 ge3,5qw oo .0.hor.zcz)kdtks 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 ox5o6+ ep7m 1 sjwvq e9ejjun.4fx2b: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 thej 7.o :esx9+5m vqf oj1xebpuwe 264nj average constant force exerted by the ground on the object while coming to rest?

  12.48: An object of mass M is dropped from aheight H above the groundn.bwizdjy 0)8. The object bounces off of a horizontal surface in a collision lasting time T. The 0n jb dzw8.)iyobject then rises upward to a maximum height H/2. What 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 length L is pulled sideways until th8ii4t-*yf(azjlf5 / g6(ryz5 mkoy fpe cord makp 8(fz65(laf fi/y rgy -z*iomj ytk45es 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 incl*cvibf7ozwk 2rplohf3) s:- 5ine of unknown angle. The sled, which started at the bottom of the inclineiz s-:r7o5fp2*cl) kbw hf3v o 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 hill?

  06.09: A deliveryman movlqa 4 ew/6f v4*bgbs7ies 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 move7eg*bialvb6s 4 wqf /4 them to the loading dock?

  12.16: A constant force F=50N (as smg3,8clxeg r:db w7 .*-btgduhown 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 f *b3lg7wr,bd -me8guxc .g td:ollowing 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 from tva1d:t/- t j;mgb +m*aijlab k)ltw,r8fs.) ohe top of a tall tower. Ball A is dropped one second before ball B. After ball B is dropped but before ball A bol:/ t*jt8gtrsd,k)aaa)b1. im;wv l fm +-jstrikes the ground, how are the mechanical energies of the two balls changing?

  11.28: A person throws als(55qp1 th gbn object 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 masps5 b qglth(15s 0.5M rise above the launch point? Ignore air resistance.

  96.20: A force of 10 N stretches a k p5i5u0xn:cc3xnp 0ms(i,3cbqi5 oe spring that has a spring constant of 20 N/m. The potential energy storp(q0i5:n m ,i5cx spb5o0 iuckenx33ced in the spring is:

  97.10: A compressed spring has 16 J of potential endvx1 8. szgx)r62 ybs:7pk sttergy. What is the maximum speed it can ixsd vkz)y:7tgt . rbs6xps 128mpart to a 2.0-kg object ?

  

  10.31: An object of mass maznmrmcm jz +trz6/9;g x*0 3M starts 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 top of the incline with speed V. How would the work done by the person on the block compare for the two trialsa ;z 3 cg6xm/mn z0mjmr+zr9t*? Assume the same constant non- zero coefficient of kinetic friction between the incline and the object for both trials.