97.01: A force F directed at an angle of θ aboy1 ax9x,rn4 bzve the horizontal is used to pull a crate a distance D across a level flz1n4 xax,byr9oor. The work done by the force F is

  97.33: A softball play9mu1:pu s,b/qx3ytloer catches 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 distancedb/slytm39u1opxq ,:u . Assuming constant deceleration, the horizontal force exerted on the ball by her hand is

  99.14: A construction laborer holds a 20 kilogram sheet mo -lxha 22xq2of wallboard 3 meter aboveqo22xlm-h a2x the floor for 4 seconds. During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block s2 0qtbc cce:2izz.9o kc rx3r1lides with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 J in0: 3o crzz9ct xrcq22e.ikbc1 this time.
What is the average speed of the block during the motion described?

  17.12: A 5.00 kg block slideslp3 y5z):khae 5i;fur36c2t 1gtgj;y pqr3nm with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 J in thim ltgrhjypuz;et6c)n y3ik51:q23 pr a35f g;s 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 fy cc6l14o:pudui f.g9orce directed to the right is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on a 6d.pcuocl:41 f y9ig uhorizontal 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 block f8n7uzcv4x7*b3dv c6 lc i c+mfor 5.0 s. The block was initially at rest and slides on a horizon3c 7nc7xdi cuv4 v6lzf +8cmb*tal 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 pondcd5zvg 7xslt:y/nj5 4 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:s4/ 5tz v 7yld5nxcjg other direction. Which of the following correctly describes the above situation?

  03.14: A fan blows the air and gives it kinetic energy. -ad:1 kvauux) An hour after the fan has been turnaa:k 1ux- uvd)ed 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 of 3.0 m, a s8d8 t4,p5p;s3d i 26-xzdk wsmzjjwng peed of 4.0 m/s, and an acceleratiszg-tp5dd w82z6isn dj8,4jw ;p xk3mon 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 zbs*adv)g;ch i; :h q9the 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 do on the box.qd9 iazvbh ;*gch ;:)s The box has a mass of 10.0 kg.

  02.32: An automobile engine delivers 24,000 watts (about 32 horsepower) of m 6:oq139j5zdm6hvw buzl9io)v qn;mpower to a car's driving :imz d63om9;vnz j569lo qbu qv)mw h1wheels. 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 car?

  09.13: In the figure to the right )e.v(bywt;rt , 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 left with a constant fovyt)tew. rb (;rce 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 t1v l 50gjecl8.drm)ico the right, a box moves with speed 5.00 m/s at the bottom of vg0ic1 d)8c je5.llmra 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 starting from rest, along a slef4 rv (m*v-sc.un q)traight road. CarA has twice the acceleration of Car B. After traveling a distance F, Car A has speed B. When Car B has traveled the same distance F, what ise ) vm(rvncu4-q f.sl* its speed in terms of B?

  12.07: What is the net force acting on the object ) i7rp96 qfdr,j87fdt-haj (uk u.xevduring the time interval of th-jt7u,i9rp fq(k ra7u hddv.)68j f xee acceleration?

  12.08: Through what distance does the object move during the :d cup+4-t+etkwlo +itime interval of the+ctu+l- ke+d: 4woipt acceleration

  12.19: The magnitude of th1aq: -hxdzcw/e linear momentum of a 4.00 kg point mass is changed from 6.00kg.m/s hzaw /dqcx1 -: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 this time interval?

  14.11: A crate gains 36.0 J of kinetic energy while its speed is incz2; b +cdkwr*ebfyn,k(dh+ p6 8d (pcereased from 2.00m/s to 4.00m/s. Which one of the following choices best repre;*dcwdze f( p2 +b8 k(kphnd,6r+cebysents the mass of the crate

  94.38: A force F at an angle θ above the horizontal is used to p1daaly) ciot.44u )vfull a heavy suitcase 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 l 4).yut fc )4odi1aavby the frictional force is:

  14.31: A toy crane exerts an upward force and delivers a useful po 0 hk. tfa(ljtg,n)7gdwer output of 0.10 w to raise a block vertically at a constant speed. At what constant speed will this crane raise a 0.20 kg bl.(ftltgdghajn) ,7 k0ock?

  12.18: A 1.00 kg object is released from rest near the surface of the 9nq1 :ylpaj m2Earth, the gravitational force acting onpy2aj:nl 91m q 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 hy5 tzy* e:w(cto above a hard floor and released. Assuming that the collision with the floor is 5wz:y*yet ct(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 movingkyxfle d*n 8i3fx:25f at 28 m/s. The driver sees a barrier ahead. If the car takes 95 meters to come to rest, whatx38k xifn2:dflf5ye* is the magnitude of the minimum average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows do;kwzb*4cutm6ya2+jh2fo4/o 5hfj l qwn uniformly until it stops. If the ball travels 15 meters, what was the average net force applied while it was coming to a stop?6+/fo j*;auf bhm5qc l2w2thk4y 4 ozj

  02.26: Consider two labor;sx5;i l +z,3mmqrfpwatory carts of different masses but identical kinetic energies and the thrwzs+qm3r im5 ; fx;l,pee 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 is tosse 2nvl u+pls,0sd vertically in the air with an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potential es0up2,vl +l nsnergy when it reaches its highest point?

  06.20: A boy jumps from rest straight upw)y:euw 5c,n7n zqsbn(ard from a flat, stationary concrete surface. The boy, of mass M, leaves the concnqy,scueb5)n w :z (n7rete 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 obje.sn3p)xil 7u atzlw,8ct crashes into some soft earth and comes to rest by compressing the earth a distance of H/2. Assuming that 8sl7n 3z p,lwxi )a.utair 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 ma9) ccxc44z see b h9twgswq r:+72yo7xs9nl3jss M is dropped from 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 maximum height H/2. What was the magnitude of the average net force acting on the maseglz9tb7x) :sq94c7j +xcwo3s cynr 9 2sh4wes during the collision with the surface?

  96.38: A pendulum bob mass mon a cord length L is pulled si.c1 cwc-t2aj xdeways until the cord makjct .x12a wcc-es 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. The sled, wh+/ts g hh7ctos x0r;y(ich 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 speed when it returns to i o7ty(x h+;sct0 hsrg/ts original position at the bottom of the hill?

  06.09: A deliveryman moves 10 cartons from the sidewalk, along a 10-meter ramp tomz6atr/)5q d 5l vi/fe.xj(g o a loading dock, which is 1.5 meters above the sidewalk. If each carton has fmg l( j/o/t5 5vizqe.xra)6d 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) -k.msefj cg7 ; bg2:osis 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 represents the work done by the force F ontsjo; :s-eb .g7mg 2cfkhe box for the motion?

  04.48: Two identical bowling balls A and B are each dropped s8 o*o0tx qplpirpb46y*u*l7 from rest from the top of a tall tower. Ball A is dropped one secondppxy8o* 4 7ltbp* 0q isur6*ol before 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 with an inq6gqkcmh3 2 n2x yd7o:itial non-zero speed v. The object rises to a maximum height H above the launch point. The person now thrxdn2:hq 6y 3cgoqkm72ows 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 u 1m(m;)8tx71r va oan/7umvfp nm4exconstant of 20 N/m. The potential energy stored in the spring iru7mv1 fv1 ) p xa8tmea/4on mu(mnx;7s:

  97.10: A compressed sprp/u m8/x t7tbning has 16 J of potential energy. What is the maximum speed it can impart to a 2.0-kg objeunbtt8/7mx/ p ct ?

  

  10.31: An object of mass M starts from rest at the bott,k-u,sy in j5wom 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 incljwk, n-5i, syuine 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.