97.01: A force F directed q qk*g,52bfvmat an angle of θ above the horizontal is used to pull a crate a distanceb,q2 vgm*f5k q 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 her w 0z42ph0z vvxbith horizontal speed v. While bringing the ball to rest, her hand moves back a distanced. Assuming constant deceleration, the horizontal force0vxb hz4v0 2pz exerted on the ball by her hand is

  99.14: A construction laborer h+, n-wh/dppq si 5; kxcfji(q6olds a 20 kilogram sheet of wallboard 3 meter above the floor for 4 seconds. During thq ihj/6 cq+fpskx dw,i(-;np5ese 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform acceleration on a ho)et )r,xzfv lty*+ drpk7ym:2rizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 J in thye)*zk ) ,ltmtp7x:+rd2r yfvis 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 horiz ai s-nsae960 z;/tqpiontal surface for 5.00 s. The bloc 6i anatzq9/s;ps -e0ik’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 force dires4t x2) s pemg8m*nwd5cted to the right is exerted on a 3.0 kg block for 5.0 s. The block was initwsemp g x t)n25d4sm*8ially 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 3.0 kg bloc 2gcmvfm+,4dd k for 5.0 s.c+f vmgdm4d ,2 The block 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 initiallyw r 17s/je1sf1xg ;ubn at reston a frictionless frozen pond throws a 1 kg hammer in one direction.nsewb1; /1sxf r1j gu7 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 the above situation?

  03.14: A fan blows the air and gives it kinetic energy. An o.42)fh5 n jzcx8 jhrzhour after the fan has beenjh5rxo j8nh2zz ) f4c. 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 pod-,pvn z1do z3sition of 3.0 m, a speed of 4.0 m/s, and an accelerati1p nzovzdd3-,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 on the middle shelf in the bookroo,s l n6 zq2et dg0zrods*b5 2e)-k0ihym 1.3 m from the floor. If the janitor relocates the b02h rz6)e5* 0yidtnsz b ,2slegokdq-ox 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 delivers 24,000 watts (qlvlgdjg o17 /)a9mk*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 force all mj*q9kdvgog7/a1 )cting on the car?

  09.13: In the figure to the right, a bk)3 gdo4q 3 dctwf4h3lox 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 ofd doh33)ct4w fk q3lg4F = 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 bo9ex;zwq b6 dskn70 gh;x 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 of F = 240N. The box, of mass m= 20.0 kg, 6gh 0db;9wzqe ksx ;7nhas 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 trav+* h vj2w w 8ghrg1b*ppysco(9el to the right, each starting from rest, along a straight r1bvjghphyp2(*ww gs 9* c8+ rooad. CarA has twice the 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 tip4cax; /nowx 9me interval of the accele oan 94/xpw;xcration?

  12.08: Through what distance does the object move during the time interval hw u(ot jsc*pxvtwg11d16b72of th 17t6cswdtx *gv(o1wuh1j2b pe acceleration

  12.19: The magnitude of the linear momepe lf *v8cr,i;eh2 g,entum 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 change in the kinetic energy of the mahf,i* ;,egrepel 82vc ss during this time interval?

  14.11: A crate gains 36.0 J of kinetic energy while it(cjfu 0pwa+/o ww p/d :kzij)fd 5w0l:s speed is increased from 2.00m/s to 4.00m/s. Whi)w5o0 c/ zwapw d d0jl: u(j/fwi+kfp:ch one of the following choices best represents the mass of the crate

  94.38: A force F at an angle θ above the ho )2jp+6 lojgjqnmdck.c) qq83 rizontal is used to pull a heavy suitcase of weight lccj8 )q +pj3d.ng )6oqjmk q2mga 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 delivers a useful po t uitc34lftr5e)y4/lk4w;dl y - k8zfwer output of 0.10 w to raise a block vertically at a constant speed. At what constant speed will this crane rf c il y-4lttkdk;elt5 4fzy3r4)/ uw8aise a 0.20 kg block?

  12.18: A 1.00 kg object is releasmtgj w t/f.e*,ed from rest near the surface of the Earth, the gravitational force acting on the 1.00 kg object by the Earth does .ef, g t*w/jtm10.0 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 h2 cu:uw3qmk.2hjw, aveight ho above a hard floor and released. Assuming that the collision with the floor is elastic, which one of the following graphs best shows the relationship between the tota .,ucvmwa232h:ukjqw l 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 h1j1+w4ipt8vubp*hypgy: k )sees a barrier ahead. If the car takes 95 meters to come to rest, what is the magnitudy*i ppuykwgv:tj4+p h1)bh 18e of the minimum average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows down uniformly until it stop3y n,p:q hr3d;rr6c7c 5 vtsthf+2f gqs. If the ball travels 15 mqyh ch;sdg: +3pt5 6vr ntfqcr732,freters, what was the average net force applied while it was coming to a stop?

  02.26: Consider two laborato;mt aobv w.i l(i-4 nw/w/:ncary carts of different masses but identical kinetic energies and the three follo(4wo.v i/wn tmwi a:/- ;abnlcwing statements. 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 an initi8p)v)b6 ;dkji*-zarf ql;ks pal speed of 4.60 m/;p q*; i)vrks ad kp-z)fbj6l8s. Ignoring air resistance, what is the change in its potential energy when it reaches its highest point?

  06.20: A boy jumps from)g hhuyc-r5(.6b xvqo rest straight upward 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 normalcgq5yrb(- o)hx 6 uhv. 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 ob9fr,wt5 ss dh913y lted7ryi -ject 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 t f9tdryr- yw1h ,935sdt sie7lhe object while coming to rest?

  12.48: An object of mass M is droppedw( h4d mtw0i.bk j m2+axe,b.qm7 ;rn ;4kvznw 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 was the magnitude of the avert( bmnjv2k,q ;k; xdwam4mb hnwz .ewi70 +4.rage net force acting on the mass during the collision with the surface?

  96.38: A pendulum bob mass mon a cgaz 1wkkt1 5;oord length L is pulled sideways until the cord makes1kg ;ta 1okwz5 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 inclin7qnu7 tely+nw.4- xj))xtb gie of unknown angle. The sled, which started at the bottom of the incline mov)7). 4ejw7uyn- +xbttqx i ngling 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 moves 10 car t .+l)e0czadi9qaaw*tons from the sidewalk, along a 10-meter ramp to a loading dock, which is 1.5 meters above the sidewalk. If each carttq0a9i zeaaw+lc.d* )on 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 shoo)t3-a 9 s6ky:o ,xq/xygbjh yxchgo8k+ 5c b:wn 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 kgq-y5ax/ oo k6hjygk :3x og: ,)xc89y+cshbbt . 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 rkj .3mk za6gv rul;xh9u:.x+ 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 bx uml9gz k 6.k:.u;jrrxavh3+efore ball A strikes the ground, how are the mechanical energies of the two balls changing?

  11.28: A person throws an object of h9ntkdbn :zm:bbl)f m6h6 (/h 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 ob zhb m6dlf/k(mth)b bn: 69n:hject 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 spring that has a springae q :( 7grezhz+o9io4 constant of 20 N/m. The potential energy stored in thez 7io :qh9oe g+(4ezar spring is:

  97.10: A compressed spring has 16 J of pb he8kzo8+gn1a p o(s.otential energy. What is the maximum speed it can impart os.o8e 1+b p(zkn ha8gto a 2.0-kg object ?

  

  10.31: An object of mass M starts from res9ne*i,w icdc 7swdbgvdj3/y.10d0p t t 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 trials? Assume the same constant non- z*ev 31j,iwcdib0tsd07w./ yc ngd9p dero coefficient of kinetic friction between the incline and the object for both trials.