97.01: A force F directed at an angle of θ above the horizontmq+:h p.sz 3.bqrsn (ko* e2jgal is used to pull a crate a distance D across a level floor. The work done by the fprmn2zj (se.sbh*k:o. q3 g+qorce F is

  97.33: A softball player g /8k38n-nwzb;km trgcatches a ball of 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 ho -38z/rm8gt nnb kgw;krizontal force exerted on the ball by her hand is

  99.14: A construction laborer holds a 20 kilogram sheet of wallbo g y6j-a*z i3osh0n+kgard 3 meter above the floor for 4 seconds. During these 4 sg yzj6s0hg-+n3*koai econdshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides wi2 y1:/0duazj6hn wuuw th uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 J6adhw1zyuuwn /uj 02: 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 a18ow5oua0jd f2 d lv4e horizontal surface5leo4 fo0u8w1 d2ajd v for 5.00 s. The 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 mcc, 6(pw r. fae7fiy;a-inl 6directed to the right is exerted on a 3.0 kg block for 5 7,6.y i-cn6aa(lfwcep i;fmr .0 s. The block was initially 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 exertedd4wlo v 9jg6+s on a 3.0 kg block for 5.0 s. The block ojs4g9+l d w6vwas 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 pon/lp6rg hdk -e -++orxayb-o.bd throws 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 correctl p l xrg/ob+h dak-6reoy-b.+-y describes the above situation?

  03.14: A fan blows the air ann1dq;b tt t j6(o)1jdmd gives it kinetic energy. An hour after the fan has t n t1j)6o qm;bdj(td1been 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 position ofo6pm e.:1y o0ub1hfw z8h uy2a 3.0 m, a speed of 4.0 m/s, and an accely1ezy.oh0b 2 8whufuo1 6mp: aeration of $1.0\; m/s^{2}$ . What is the kinetic energy (in Joules) at this instant?

  05.05: A box of old textbookwa2rc,bijs: 6 s is on the middle shelf in the bookroom 1.3 m from the floor. a:i6bs2, jwrc If the janitor 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 engine delivers 24,000 wattse0b/aoy*iv ub )w5 he7:n3 cko (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 acting on the cwo:c50eek 7/bhnb3vo i ua *y)ar?

  09.13: In the figure to the rivi:)dp6m,k *cc(r hjr l5amj( ght, 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 inccjh(i kjr*, 6:m l(rvp acd5)mline 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 with speed 5.00 m/s at t 6 pjv+uvv:hn41lj3huhe 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 vl4vup v:h1nj+u3h 6jbox, 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 starting from re:rmpsx;zc )-chs5z4( oule a5st, along a straight road. CarA has twice hlsmca-p;( ezo55s4 : zxur)cthe 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 objectgp28-cd1vl sx during the time interval of the acceleg p1d82s-cx vlration?

  12.08: Through what w c k-4 k;8u1sabsa5ipywqx 7)distance does the object move during the time interval of the accelecsu-b8x4 )7 a1ys kpwk;5wiqaration

  12.19: The magnitude of the linear momentum of a 4.00 kg point ea0 fbwm(1ndk1c/ j.rmass is changed from 6.00kg.m/s to 14.0k10. eamr/k nf 1jw(dcbg.m/s in a time interval of 6.00 s. 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 is increased froivr4n/qzuu* 0:gevg 8m 2.00m/s to 4.8izv:gn 4 qrue uv*/g000m/s. Which one of the following choices best represents the mass of the crate

  94.38: A force F at an angle θ above the horizontag0h u:5dotfvv 4sh:d *l is used to pull a heavy suitcase of weight mga distance d along a level floor at constant velocity. The coe5t v:h0dghv:f4*s d oufficient of friction between the floor and the suitcase is μ. The work done by the frictional force is:

  14.31: A toy crane eh et8; 20;us.kwb uikxxerts 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 wille ku ktxihb.20; ;uws8 this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is released from rest rn9sst .g qsw*u6*(uj1 iw* p k0ofb7nnear 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 done by the gravitational force acting on the Earth by t.iwq*os sf10tuk9n pr*ws n7gu*j(b6he 1.00 kg object during the fall?

  96.18: A rubber ball is held motionless a he - qedw(t 5+nt;5ohkol kd2yc2ight 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 kotc wyddthoqn-2el k25 (;5+ 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/sre;9 d, kw+1jt s)y 6(jfasth b)9xxkf. The driver sees a barrier ahead. If the car takes 95 meters to come to rest, what is the magnitude of the minimum average net force neces,fby1 wejtr(9;h)s )j9s kt6 xd+a xfksary to stop?

  00.26: A 500-gram ball moving :37 b2r7vsyrh gl5q 1 kpu(pycat 15 m/s slows down uniformly until it stops. If the ball travels 17 1(2 lckypr5gu7ryhb pq: 3sv5 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 kinetii*li/;cf 4eqw i1g ;hcc energies and the three following statements. icgc/ ;f*q4ihel1iw ; 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 vertejp+d e7an.m e-y *;icsvjy;7ically in the air with an initial speed of 4.60 m/s. Ignoring air resistance, what is the change inye+i7me;; janv-p7 y*d .secj its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straight upward from a flat, stationary concrete lkg. n w6 bcs x,of4ezix/(u-2surface. The boy, of mass M, leaves cs nw u lxbi2-6e.4x /k,(zofgthe 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 aheightH above the ground. The objec -(tvoguj-i*it 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-j- (iiutv g*o force exerted by the ground on the object while coming to rest?

  12.48: An object of mass M is drir2cqa ,(3 b4oxd*ggoopped from aheight H above the ground. The object bounces off of a horizontal surface in a collision lg goc4i,3d*x2bqr oa(asting 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 collision with the surface?

  96.38: A pendulum bob mass mon a cord length L is pullel y8ry/vc; nlby,ku;,d sideways until the cord makes an angle/kllyn b;yc8 ury v,;,
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. The sled, whj8;an pc7ot0p4i sgz(ich started at the bo04 pp 7az(8;jitcsn gottom 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 speed when it returns to its original position at the bottom of the hill?

  06.09: A deliveryman moves 10 cartons from the sidewalknlcvvo2 4pdv( l8t1r3 , along a 10-meter 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 tov2o 43vpl 8 nrcvt1dl(tal work done by the deliveryman on the cartons to move them to the loading dock?

  12.16: A constant force F=50N (as z f*):ov vzy9p;z:v u1t;lweushown in the figure) is applied for the 6.0 meter motion of the box upward along the incline. The mass of the o 9v);:fyvzu wlpu* z:tz;e1vblock 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 bowrpf n0 uwqb9 iuy(2 wcqvc,462ling 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 ground, how are the mechanicalww0qnv2r4q26ic pbf, cu 9uy( energies of the two balls changing?

  11.28: A person throws an object of mass M orkg ,jxr,+ukz52w (l straight upward with an initial non-zero speed v. The object rises to a maximum height H above the launch point. The person now throwskx+uj5z gk,o,w(lrr2 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 spri*e 8q,ty(36v wxrk wt/pj/j-kai rs4i ng that has a spring constant of 20 N/m. The poten(jiy-j* t6v/ a 8itresxq,w/3rp4kk wtial energy stored in the spring is:

  97.10: A compressed spring hascyu9pgh9l 5u)ka .s 2i 16 J of potential energy. What is the maximum speed it can impart toy2 5psclhu )g.99iuak a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the bottom of a fin ,ftk1r+, z/x bmsd0wxed 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- zerf,m / x1s zb,dn+rwt0ko coefficient of kinetic friction between the incline and the object for both trials.