97.01: A force F directed at an angle of θ z3nb5;dvhqo7 above the horizontal is used to pull bd 7qhn5o3zv; a crate a distance 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 tj vj +4vrk2 4md4pl(bkoward her with horizontal speed v. While bringing the ball to rest, her hand moves back a distanced. Assuming constanjrjkm+4l4 k2 d pvv(b4t deceleration, the horizontal force exerted on the ball by her hand is

  99.14: A construction w4yr3dpmc 9w*laborer holds a 20 kilogram sheet of wallboard 3 meter above the floor for 4 seconds. During these 4 secondshow much power warm pw9dc3*4yws expended on the wallboard?

  17.11: A 5.00 kg block slides with uniforj /d/ov:1tc kam acceleration on a horizontal surface for 5.00 s. The block’a/dv 1okj :t/cs 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 a bt*s-ve--gjh wyk3i8cceleration on a horizontal surface for 5.00 s. The block’s kinetig i wj*3--y8hbe stk-vc 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 for;yl 8( d ynryy(emx*qb;fb6yo.;9horce directed to the right is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest an*md ;986x rnlb;y;eyyoqoyb( .( rfhyd 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 o)iv cgt0+oq;to the right is exerted on a 3.0 kg block for 5.0 s. The block was initially ov)0+ci;qgo t 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 throws a 1 kg hab-ihfp6a-yblv- . uk3mmer in one direction. After the throw, the hammer moves off in one direction while the student moves offv k-i-u6h pbaby3l -.f in the other direction. Which of the following correctly describes the above situation?

  03.14: A fan blows the air and gives it kinetic ene: mtywk/b4 cs:rgy. An hour after the fan has b/wk b:tm: 4csyeen 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 posi+5zrbuh j5 fc1tion of 3.0 m, a speed of 4.0 m/s, and an5 f bz1r5+cjuh acceleration of $1.0\; m/s^{2}$ . What is the kinetic energy (in Joules) at this instant?

  05.05: A box of old textbooks is onza/d soa*q z.9 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 m from the floor, how much work does he 9ozdq s. /*azado on the box. The box has a mass of 10.0 kg.

  02.32: An automobile engine delivers 2nq-;em j,f2n)dn i0ybwj3 ; gx4,000 watts (about 32 horsepower) of power to a car's driving wheels. If the car maintains a constant speed of 30 m/s (abob;)3qm0;n,jjwe2gy d n f xni-ut 65 mph), what is the magnitude of the retarding force acting on the car?

  09.13: In the figure to the right, a box moves8-qbuj hmnl6(z lcs 4za/(.w1tva n r- 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 -v( s./q( hmjlzrn a16lbw48 tcz-u napushed 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 5.00 m/s at t2p-i-e oj pu0 sd3xbwfw s+,t8he 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 8+3-ewwp 0uj sositdx2,-bf p 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 from rest, along a s8 .s5qprkx( fjtraight road. CarA has twice the acceleration of Car B. After traveling a distance F, Car A has speed B. When Car B has travelefxs(rpq5.jk 8d the same distance F, what is its speed in terms of B?

  12.07: What is the net force acting on the object h;.z:sr3 aoju kweu27 during the time interval of the accelre :o3uzwshja ;k.u27eration?

  12.08: Through what distance does the objh3e9qyln5b x5tf f;h7 rb*k9oect move during the time interval of the acceleraof3ybhtr7x* kh9 5fl; qb95en tion

  12.19: The magnitude of the linvx h24;mkpg(*x he j;dear 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. Wh(vk4xg;jxeh2*p;mh d at 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 is i/ c+7vusf60ypr35y, km8pyr j pstjt7 ncreased from 2.00m/s to 4.00m/s. Which one of the following choices best represents the mass t pfr,s/+3pjm70s5yy kcyjur6 vpt87of the crate

  94.38: A force F at an angle θ above the horizontal is used to pull a he/2t9m ,k*;b iw 1hjhv/ ,z5t wnteoqvtavy suitcase of weight mga distance d along a level floor at constant velocity. The coef*e,19hi5/tmv,o2b hwvt q/j ;ttknz wficient 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 pow0z44 yz osm7gder output of 0.10 w to raise a block vertically at a constant spe4oszzd0gy74 med. 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 surfacem;f.obur fija/lys u7, 9gy1*c+gh t) 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 /f 9j.r,mf suotcha y)1ilg*by7g+;u 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 hain qxe e1z*8jrex/+ w(rd floor and released. Assuming that the collision with the floor is elastic, which one of the following graphs best shows the relationship between the 1ri8xwjee/qe+x * z (ntotal 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 barrdduuy1s0-)j zm )h r0-v5dozlier ahead. If the car takes 95 meters to come to rest, what is the magnitude of the minimum average net forcehjd)-10sumu) z yz5d l-d0rov necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows down untx)5nwro .zq6 t/st8e3-iuzviformly until it stops. If the ball travels 15 meters, what was the average net force applied while it wa-t)v. o3trn q6ues5 w8zit/zxs coming to a stop?

  02.26: Consider two laboratory carts of different masse)gzq d98e 3cnqs but identical kinetic energies and the three following statements. Which of the above statemenqq3z)g cd9e8nts 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 initld v s-z5ye3;kc .)kh71n rgztial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potential energy when it reaches its highest point7z)dcg1nsk3l5t; y z h-v. ekr?

  06.20: A boy jumps from rest stra9 xwzty oh8uetbjbcq7(b/08: ight upward from a flat, stationary concrete surfacw7b oczq:t88xy0 b bhue(9tj/e. 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 concrete do on the boy?

  02.48: An object of mass M is dropped from aheig )*q1unmj(8o 9zxqzl ohtH above 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 jqo )z19zuq(nox l8*mmagnitude 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. 49+2zu0 znh2u wgjmvqThe object bounces off of a horizontal surface in a collision lasting time T. The zu uz0h 9+vn22jg qmw4object 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 unijr73ni7 u;6kl+yi g ttil the cord makes an angle 377 ik;+ul irj6nt iyg
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 incjklv zntb z.)+kxy 3,9,kdx i+line 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. nd )+, z9xxj+l tiz3k,.vkbkyThe 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, alon )rt ,u-gw1d,f;,r8o wkhvkpmg a 10-meter ramp to a loading dock, which is 1.5 meters above the sidewalk. If)rm8,hd,- o k1;ruwgwvtf,p k 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 figure) is applied foh3-j(9a q s ge4i+(4 cl9k2nm vwgicvxr the 6.0 meter motion of the box upward along the incline. The mass(h eqjawl9x4 g(i-2vm 4kncsg+ 9c v3i 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 bo yvga0n195obp2 talh1wling balls 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 the ga1nl9y10 vhpotg 25baround, how are the mechanical energies of the two balls changing?

  11.28: A person throws an object of mass M straight upward wi:g rhnzjlc 2 :gyr5h88th an initial non-zero speed v. The object rises to a maximum height H above the launch p8gzj rnyh g2h5::lcr8oint. 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 xdkq, 7ixclp9v cc / n1)m v62 sjxj0ox-z+sq4spring constant of 20 N/m. The potential energy stored in the sprin 2 v s x cj6+9nd7x4x-izqkoqcvmj01l/c,spx) g is:

  97.10: A compressed spring hxv8r( r qk du-h ai::k1abus3si06l )zas 16 J of potential energy. What is the maximum speed it can impart to a 2isu) likk:x 6 8h(sr3u0 1-zadbqrav :.0-kg object ?

  

  10.31: An object of mass Mj3 zcx hsrl1joz:3-0j 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 trials? Assume the same constant non- zero coefficient of kinetic frictionholr-13:jj30jzzs xc between the incline and the object for both trials.