97.01: A force F directed at an angle of θ above the horizontal is ur a6h5as qoy cbt 0j-30j.dj1rsed to pull a crate a distance aoh0.r t3- 1a05dqrj6sy cjbjD 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 moe3z7jwhf c9e zj(he r;c9la( (ving toward her with horizontal speed v. While bringing the ball to rest, her hand moves back a distanced. Assuming constant deceleration, the horizontal force exerted ozj((7 ahe(ce39hl ; cezwj9f rn the ball by her hand is

  99.14: A construction laborer holds a 20 kilogram sheet of wallboard 3 mecd a +d-0bpn*lmv3wzs52f 3zhter above the floor for 4 seconlsa*2hwv-0p mc+dz 3nz5 b 3dfds. During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform acceleravzx2 /-eb; rb en14tpjtion on a horizontal surface for 5.00 s. Tz-e24 x1 btbvnre;pj/ he 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 i.*kgd5 7ifjao6a9 lba horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 2i9b5lk*foja adi.7g 6 0.0 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 is exerted on 8t yzd 9 ip(s+k1j4fyqa 3.0 kg block for 5.0 s. The block was initially at rest and slides on a horizontal surface 8( sf9piyjytq 1zk+4d.
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 exertog6 a-d:vvio8n w: pk4u:id2yed on a 3.0 kg block for 5.0 s. The block was ao8w2 :p doi ykivnvu6g:4 d:-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 thro09h xmie8d dn)ws 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 09)xi8 ndd hemfollowing correctly describes the above situation?

  03.14: A fan blows the air and gives ijjsty;i*8b0tv3:/zg y vo k9et kinetic energy. An hour after the fan has been09/bgjy:; zkvy is83v * jetot 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 po wr/l v;.9seh,p -vy2j;avi tosition of 3.0 m, a speed of 4.0 m/s, and an acceleratv;swv / rte,ao29.v;l-hpj iyion 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 middlh7 -p mzjfg*9:n-ggtq 9h mi0xe 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 mucxp-:9tgm 9gqg 0* h-hinzmj f7h 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 horsepower) of p ja6g4q r)pb+uzh0ky/ower to a car's driving wheels. If the car maintains a consta /hy bg6uqr0pk)4a +zjnt 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 with speelxow8o l :iu* -b+c*nn.5eob sd 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 plo.os5* b +x :einl c8owb*-nuushed 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 . w 8xqeeaeagot 17/rk -fqeao,h/08w5.00 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 w 0e8a8 rxe.h-e,aow ef7oq/g tq k1/aconstant 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 riqg 6sqocu gvn. 33cxzz6y26v+ght, each starting from rest, along a straight road. CarA has twice thzqvyu g+ vg 23cx3nzc6s6.oq 6e 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 fok*jzp2) mkufhpv 9 4e(yj+) wdi/85oz wjn k-vrce acting on the object during the time interval of thy9u2m)jfpv/4(e k*d5 wk ijph )8-vonw+j zzke acceleration?

  12.08: Through what distance does the object move d dx- blbm1gz7u00 xw)muring the time interval of the acceleratbm )lgbu7-m w zx10xd0ion

  12.19: The magnitude of the linear mom: i djeoru(--i;.jja qentum 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 mass during od( e jq;-- juriia:j.this time interval?

  14.11: A crate gains 36.0 J of kuhb1 ck0f7-yainetic energy while its speed is increased from 2.00m/s to 4.00m/s. Which one of the f7-uyfcbak10h ollowing choices best represents the mass of the crate

  94.38: A force F at an angle θ above the horizontal is used to pul34g8 oi xyvkg+/ btagb8vii9:l a heavy suitcase of weight mga distance d along a level floor at constant velocity. The coefficient of friction between the floor and tk4ii8:ygv o gi39/vxgbat 8 +bhe suitcase is μ. The work done by the frictional force is:

  14.31: A toy crane exerts an upward force and delivers a useful power osi2ru/v azy):laf :-r*-bt loutput of 0.10 w to raise a block vertvb:s o yf*rzu --)tla2r a:il/ically 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 neas y)wkdfjp39 l: 5oxe,r the surface 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 mto the ground, which one of the following choices best represents the amount of work 9jewo)lfk:y p,3s5dx 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 motionle3yh.tdczj bp3(/r/ z xss a height 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 total e/ 3tj( d xz/3cbrh.pyznergy E of the ball and its height h above the surface?

  07.06: A 500-kg car is moving at 28jci x+hwd 7)5f m/s. The driver sees a barrier ahead. If the car takes 95 meters to come to rest, what is the magnitude ofh5j7dxc+i w)f the minimum average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows down uniformly until it ;ku:bd) s.5m9ab r r-mn wtz;5skc0nvaai-9cstops. If the ball travels 15 meted9ac5 w 0;ss-.b:mz v)aauk c5km-n;rb ntri9rs, what was the average net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of d6ei cjcs+785*m3tijx uhaw- f ifferent masses but identical kinetic energies and the three following statements. Which of the above statw*8i5tma j-h ui3e 76+jcxcfs ements 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 ctec 2 (ahgz2zyzh0c 38p0u o gd/fvc3(lay is tossed vertically in the air with an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its poto fc33( e 02da/2y0hhz cvcp8(gzugztential energy when it reaches its highest point?

  06.20: A boy jumps from res5who,s ug 4;a0c+: wrh:xzulnt 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 normal force of contact (N) between the boy’ s feet and the conl5:4ohgr,zxh w;au+ c : u0swncrete do on the boy?

  02.48: An object of mass M is dropped from aheightH above the ground. The objectebk,l3t7w+ fw crashes into some soft earth and comes to rest by compressing the earth,7l3fwwkt+ be 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 d* 1gbz:ftav/ 9/u sfrfrom 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 m/avtr1guz9d: bf/f s *aximum 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 5s4r 4l hdmp;c 90pcasmass mon a cord length L is pulled sideways until the cord makes an angle sh9c5ars 4m p40 lcd;p
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 au4lt ; g 3n-x./annqkp uniform incline of unknown angle. 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 n.p-kxnnutq /4l;a3g 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-met3tua f-h /rzs) k9qam3vh*ik 5er 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 delivh* i3sk -9v3tm r5/fkhzauaq)eryman on the cartons to move them to the loading dock?

  12.16: A constant force F=50 u3/w-hn1 bsdm15o .ra8msojr N (as shown in the figure) is applied for the 6.0 meter motion of the box upward along the inclm5owj .sa 18r1bomn3 u-r /hsdine. The mass of the block is M=15 kg. 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 and B are each dropped from resq39p djvd( .xrt from the top of a tall tower. Ball A is dropped one second before ball B. After ball B is dropped but b9dq rv x.(j3pdefore 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 u22 tq /ngidwf5. .rvvcpward 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 mass 0.5M rise above t/w.qd2 ci2f rvgvtn 5.he launch point? Ignore air resistance.

  96.20: A force of 10 N stretches a spring that has a spring constant of tlw jnu. dfdi 1j3 . ),bz,1 h3xmghgl;jpd1d,20 N/m. Thebzj;gnpl . ,x, .dd 1u fl31ht ih1jwmgjdd3,) potential energy stored in the spring is:

  97.10: A compressed spring has 16 J 0*zoq nf7ci 6.)lfy7 ej0mnt sof potential energy. What is the maximum speed it can impart to a 2.0-kg object ?eof).iy7 zm0q67ftn*n lsc 0j

  

  10.31: An object of mass M star:*t+ug pgcpp z, -ei)h08nwvgw-q i8gts 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 trials? Assum e* wi gi,cpgv8qn: g)0htu--zwgp p8+e the same constant non- zero coefficient of kinetic friction between the incline and the object for both trials.