97.01: A force F dir-5lgaxjq4 6gzected at an angle of θ above the horizontal is used to pull a crate a distance D across a level floor. The work done by tx4qzlg -gj 5a6he force F is

  97.33: A softball player catches a ball ohzu855/hotqtq at9p3s 8npn *f mass m, which is moving toward her with horizontal speed v. While bringing the ball to rest, her hand moves back a distanced. Assuming constant deceleration, the horizontal force 5nt3p/nhq8z8u t5hp aq t9*s oexerted on the ball by her hand is

  99.14: A construction laborer holds a 20 kilogram sheet of w*85u a znxvmu5allboard 3 meter above the floor for 4 seconds. During these 4 secondshow much*xn mazvuu585 power was expended on the wallboard?

  17.11: A 5.00 kg block slides w6 hq v b3vwtq m58b0opo/r1rtdzl/ +a8ith uniform acceleration on a horizontal surface for 5.00 s. //t6pr5bv0a q 3+v8 lmtzho1qrd8owbThe 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 block slides with uniform acceleration on a h5 :zrb 8z;a/pwr e.-(bj nqhflorizontal surface for 5.00 s. .fbl( -j8: /5rp nqh;aezbwzrThe 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 force directed to t jdsmtt -(2qw/*-t.kx w5dkmv he right is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a horizontal s wq- k m/wdxt*stj .td-v5k2(murface.
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 blz3k mtign1z1 :1zwp++ab2u cxock for 5.0 s. The b1xcgk3b+z12tpi + w1 zzmn :aulock 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 initially at reston a frictionless frozen pond thro8h 4py7wd 5 y,vtwd*viws 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 describ tp vy47yi8vwh d*,w5des the above situation?

  03.14: A fan blows the air and gives it kinetic energy. gqpy )*4pqjs- An hour after the fan h 4qpsy)j* g-pqas been turned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass ghm1;97ev zp 7+ykrno 0.50 kg has a position of 3.0 m, a speed of 4.0 m/s, and an acceleration o;m 7ykog91n hzp+vr7ef $1.0\; m/s^{2}$ . What is the kinetic energy (in Joules) at this instant?

  05.05: A box of old textbooks is on the middle shelf in the book( mtgr ssp..3gcc pu/9room 1.3 m from the floor. If the janitorsmc/cu3 pg (ps r.g9t. relocates 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 e1c8gxlpbn xi-az+-l5 ngine delivers 24,000 watts (about 32 horsepower) of power to a car's driving wheels. If t8zb- nl p gc-5ail1x+xhe 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 mjjo/ 6za-r6pgy t,cyicr9n(hi,s v5 ,oves with speed 5.00 m/s at the bottom of a rough, fixed inclined plane. The box slides withaj c-pvy6s n, zo,/j6i gtcir, (y95rh 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.
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 w;5wqik+2r mkd7f r g+aith speed 5.00 m/s at the bottom kk52+gwradr;i f+7q m 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, 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 startin*psep,52 yc5w h 7 sonpjc-ei5ts*-w ug from rest, along a straight road. CarA has twice the acceleration of Car B. After 5st,-*uywsp noc p-i 5se75wc*ep 2h jtraveling 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 o 9yw n)p(t 2u(re9ivqobject during the time interval of the accelyr)qtv 9n(p9 ouwe(2 ieration?

  12.08: Through what distance does the object move durz x39s )qxl+wking the time interval of the +wlxq9 kzx )s3acceleration

  12.19: The magnitude of the linear momentum of a 4.00 kg point mass is changeow1v9row 5n3 kd from 6.00kg.m/s to 14.0kg.m/s in a time interval of 6.00 s.1wnroo39v 5wk 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 speed )wur+* wwld) bis increased from 2.00m/s to 4.00m/s. Which one of the following choices best represents the mass of *ud)+lw rw)w bthe crate

  94.38: A force F at an anoo4eisam.pbji :;yoy8lza .5)3 5fq j gle θ above the horizontal is used to pull a heavy suitcase of weight mga distance d along a level floor at constant velocity. The coeffi b yi5zj4l;)ay5fe:oi .sp3qmo8.jao cient of friction between the floor and the suitcase is μ. The work done by the frictional force is:

  14.31: A toy crane exerts627x kbay t;qp an upward force and delivers a useful power output of 0.10 w to raise a block vertically at a constant speed. At what constant speed will this crane r;72 x6ypatkqb aise a 0.20 kg block?

  12.18: A 1.00 kg object is released from rest near the surface of the Earth, theq c+h.(wdfsdz v+u 4x) 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, whi us4x h d.c+(w+zfd)vqch 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 (tv jz1i::9 fx-had 4gf /fb9/updfgh-i7f yz a height ho above a hard floor and released. Assuming that the collision with the floor igbzp /h - -7(tfvy f9xgf9ua1i4/dhjfzdf:i: s 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. I)o vm:zw (gv7i/4ccvyf pa;e7f the car takes 95 meters to come to rest, what is the magnitude of the m i/va ygv4o7c7pw)z ;:(e mfcvinimum average net force necessary to stop?

  00.26: A 500-gram ball moving atik7/7yh6 3qckh uwkw k0v0t e7 15 m/s slows down uniformly until it stops. If the ball tr0kh k 0k36iywhuq7 /w7ec7 ktvavels 15 meters, what was the average net force applied while it was coming to a stop?

  02.26: Consider two la x(gd2b)il 1tfboratory carts of different masses but identical kinetic energiesg)x2b1 lit d(f and the three following 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 id p hh,ytfr7 e1i4)k:g3s *qd3vf/ fvos tossed vertically in the air with an initial speed of 4.60 m/s. Ignoringsi)k4p:h7efqd vyr ,3gf 3 d th*/of1v air resistance, what is the change in its potential energy when it reaches its highest point?

  06.20: A boy jumps frokn *n.xg*ho 5p rll),im 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 )i.,5gnopnr l *x*hlkwork 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 drqq.f (eg/ -9vygf 2hczopped from aheightH above the ground. The object crashes into some soft earth and comes to rest byhye.f gqz92 -c(/ qfgv 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 dropped from aheight H above the ground. Ths/z-,h5 vvc7l 5ecbjye 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 the col5/ zy5bs cv7l- hj,cvelision with the surface?

  96.38: A pendulum bob mass mon a cord length L is pulled siqq *v0n 1zd r6veo159xl dpp8;:ndxyudeways until the cord makes a qpp01*vex5 6nddynlxvq1 r9o8 : ;udzn 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 an g mf,98p8bwgn+goq8h gle. The sled, which started at the bottom of the incline moving at 10.0 m/s, rises to a n,+hp 8mgfo8bw 9q8ggheight 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 cartons from the sidewalk, along a 10-meter ra) jp akv2rv-b-mp to a loading dock, which is 1.5 meters above the sidewalk. If each j)kpv -2r-v bacarton 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) 8lam0b;yore . 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 following choices best represen.l ;a08mr eobyts the work done by the force F onthe box for the motion?

  04.48: Two identical bowling bal,zt2)7ou p-(ne7h ypfb (nywyls A 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 before ball A strikes uby)hy77 zw2op tne(p y,n(f- 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 initialn huq*, 1 2whnnl)oo0y non-zerhy*q1 wlo 2uhn,o0 )nno 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 launch point? Ignore air resistance.

  96.20: A force of 10 N stretches a sp01e /1h ;jao6tfxpjft ring that has a spring constant of 20 N/m. The potential en6 ftht11jo0xfe/a p ;jergy stored in the spring is:

  97.10: A compressed spring has 16 J o /hbe;)5ksv7pngzp nr l*y3+ nf potential energy. What is the maximum speed it can impart to a 2/;p nsg5pn7vhzy*blrk3 )e+n.0-kg object ?

  

  10.31: An object of mass M starts from rest at the bottom of a fixed incline of5u:/3k dd9qvlca)2/uto u ufu height H. A person decides to push the object up the incline in one of two ways with an applied forcet 52d/3 dvuo cu:u9ak lq)/fuu 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.