97.01: A force F directed at an angle ofbzvvo mlv1 o1mr3bhd66qec6 ,p::jv, θ above the horizontal is used to pull a crate a distance D across e 1,6v:1v:,ljm66bmo rvdq 3 zvbh ocpa level floor. The work done by the force F is

  97.33: A softball player catches aw6 q6pa4p9 io.-oxksb ball of mass m, which is moving toward her with horizontal speed v. While bringing the ball to rest, her hb pooaq6k9pi46s-x. wand 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 m:efearyiub o93po/n y;)00 9dqla, j 3 meter above the floor for 4 seconds. During theseoj:9 0na;pyare 9bu)3 m d/fqy,o eli0 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg blocky:si.y 8.l cnm slides with uniform acceleration on a horizontal surface for 5.00 s. Theim8y. :cnlys . 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 x7u;5lk x;;tqer 0wzl uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictlyq l;;e 5;r klutxxw70z 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 rig5k4q rol4hrt 0ht is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and40t 4roh rl5qk 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 bl ,yabzp(.y,q4 :1)nz vphwb odock for 5.0 s. T.,z :1yv ( bbyw4zpqh)p dn,oahe 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 initially at reston a frictionless frozenpsjz 6spabqk73*kl3+ l*p h1e pond throws a 1 kg hammer in one di *7+ap slj6b1k*zpqsle3k3 hprection. 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 p9xl s* fn;p6hkinetic energy. An hour after the fan has been turned off,xnpf*6;9 lsp h
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mwoo:gpk5 w1,ft2gf1 m ass 0.50 kg has a position of 3.0 m, a speed of 4.0 m/s, and an acceleratiowtfo 2pfwk :go g1m1,5n 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 bookroom 1.3 m frombtvuxup4ij.y iv3) 8vd h53d* the floor. If the janitor relocates the box to the shelf that is 2.6 m from the4 px bii8)3vu53.ddy* j vhvut 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 (about 32 horso6 hikyo7453b c1 ydrdvd;( asepower) of power to a car's driving wheels. If the car maintains a constant speei(63k ybvahdc4 y1s7odo ;rd 5d 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 the2 .o3e two0cq/jgkj7h(pn m m* 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 pushed directly to the*je pthn qo w k.3/7jmm2ogc(0 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 movescb5-2k;4zj,hpm *ycd xmud3 z 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 beingh2b45zkzu m x3yp-*jccdd ,;m 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, tl. ktxm/bp. k8;3uci+ 3nwlaeach starting from rest, along a straight road. CarA has twice the acceleratlm ;c.p3 /xnbk.tk iwa+l8u3tion 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 th2(necdo/k fk7 iwzo,1 e object during the time interval of the accelerati2dk fkc,(1/wneooiz 7on?

  12.08: Through what distance does the object move during th/l7ra dw (zwx.e time interval of the acceleratdla.7 w/ z(xwrion

  12.19: The magnitude of the linear momentum of a 4.00 kg point mass is*ux6,fqch)szr)b zu9 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 b9x*hcuszqr)fz ) u6, the mass during this time interval?

  14.11: A crate gains 36.0 J of kinetic energy whil(m(tbozawagym4.z p1 v+q05tq3 kx3 ie its speed is increased from 2.00m/s to 4.00m/s. Which one of the following choices best represents t.0 3bov( tz+y kptzamiq q ag(4m35x1whe mass of the crate

  94.38: A force F at an angle θ above the horizontal is used to pull a heavy s6lyqxn u,z/r -uitcase 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 frictiona/,rq y6nu-lxz l force is:

  14.31: A toy crane exerts an upward force and delivers a uxt 5:x0a9 8g oq 8jvlah)scch*n hym32seful power output of 0.10 w )agx9qahhsm* vh n tjc8o cl5:yx8 230to 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 the Eartslgq;50, zokg h, the gravitational 5, g gqos;kzl0force 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 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 aq pn1c18 v9tck hard floor and released. Assuming that the collision with np18kc 9v tc1qthe 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 c kto.8mepy73hf 5 yem:(-rbbdriver sees a barrier ahead. If the car takes 95 meters to come to rest, what is them( yk. t57 b:e hpoebf3mc-8ry magnitude of the minimum average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slowsf3-:tlim.q ;l* pf .;a8e cgbeb,hkc m down uniformly until it stops. If the ball travels 15*:e; mq,chi8 3pm ;..ftlaebg -lckfb meters, what was the average net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of different masses but identical ki oc)gcrxmjx/c; zeeu abqq7u25*c/7+ netic energies and the three following statements. Which of the above statements would be correct? 7/eu* azmcexu;2) /cxcg+qj 5rbc oq7
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 initial sp p3v(grf8na . l uu64;hfukad)eed of 4.60 m/s. Ignoring air resistance, what is the change in its potential energy when it reaches its np 4f)uf(va6lua;83drgu h k.highest point?

  06.20: A boy jumps from r fe(,) q.t4coem5iu deest 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 rite,oie)dcf5mu q( e 4.ses 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 the gwr0i9c rk0bi5* ok;x dround. The object cr*xb o5kwr0cr0 d9ki;iashes 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 object while coming to rest?

  12.48: An object of mass M is dropped from aheightq.n/bbxq4j /v 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 average net force actinv bj/q4xn/b.qg on the mass during the collision with the surface?

  96.38: A pendulum bo35s u2pqm hvi zj-qkc9s2 xk39b mass mon a cord length L is pulled sideways until the cord kk3- c m25h2 9uqqsp9si xvjz3makes 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 unknown angle.i8b 3bscb n-m: 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 position and momentarily comes to rest. The sled then slides back down the hill. What is the sled's speedbbni:bms c-3 8 when it returns to its original position at the bottom of the hill?

  06.09: A deliveryman moves 10 cartons from the sid.jaq 6msq a ))/;fp.tt5sun ciewalk, along a 10-meter ramp to a loading dock, which is 1.5 meters above the sidewalkfn/ mqq a.ct ijup;t a.s)5)s6. 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 fineo 3 8+z. selo4wyi3pgure) 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 folo wo p3+se43.zlenyi8lowing choices best represents the work done by the force F onthe box for the motion?

  04.48: Two identical bowling b2/5meao i7wrom ukbs1 5x5wx8 alls A and B are each dropped from rest from the top of a tall tower. Ball A is dropped one second before w2a8uio15/mxr5ok 5meb 7 xsw 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 wx(v3 c:q,w glwith an initial non-zero spee gq, 3:lv(cwwxd 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 spring that has a spring ce ofdsg 1zr22 3g,5t:quvz cl8onstant of 20 N/m. The potential eneue2trgfl5z qd z 8g,:c21v3sorgy stored in the spring is:

  97.10: A compressed sprin(l kg:bh8 nc,wg has 16 J of potential energy. What is the maximum speed kgl,8(n:wb chit can impart to a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the bott1js,2eh l*ah .ij ip+yom 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 sahjsy 2p1e a* hlji,.i+me constant non- zero coefficient of kinetic friction between the incline and the object for both trials.