97.01: A force F directed at an angle of θ above the horiz bwf8)s-ta( 2mh gc 5c9b z2ye8xyt-grontal is used to pull a crate a distance D across a level floor. The work done by the 2 ( g8m crbsg)2tf-yh a98tyc- xz5webforce F is

  97.33: A softball player catches a ball of mass m, which is moving u l5ok)zl wi l+ 34aqp*4jjy2ltoward her with horizontal speed v. While bringing the ball to rest, her hand moves back a distanced. Assuming constant deceleration, the 34 kjz+po lqiy 5jaw*4)llu2lhorizontal force exerted on the ball by her hand is

  99.14: A construction c 148 ,*defx +kbfqysilaborer holds a 20 kilogram sheet of wallboard 3 meter above the floor for 4 seconds. During these 4 secondshow much power was expended o8yd q4k is+e xb,*cff1n the wallboard?

  17.11: A 5.00 kg block slides with uniform acceleratio-3lfpwn0z(kdqri b 1fa8ub38 n on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 2zanlffb3i q3 (-pw 8u0b dk1r80.0 J in this time.
What is the average speed of the block during the motion described?

  17.12: A 5.00 kg block slides wi ph.34:ovmmn fs i7i19blqx)q;i jy b9th uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic enep7y4i ;1nlbq b )vx:9ioi.3qm mshj9frgy 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 directed to the righ:ah qk1:bd/uxt is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and sli/hx: bqd1:uk ades 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)/xg 0hvtzng 5kci 9io17o owb7rb6r0 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 horizontal surfacozg09 g5nk i)c br6r/7v1toowx7ih0b e.
What is the kinetic energy associated with the block after the 5.0 interval?

  00.15: A student initially at reston a frictionl w4 b7ijhc(ab:ess frozen pond 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 correctly deb ba 4(cwhji:7scribes the above situation?

  03.14: A fan blows the air and givcmx;)4a j(- jwgjs-m les it kinetic energy. An hour after the fan has been tg4mjcl-()m jj s;-awx urned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0.50 kg h ka4t))kv tno;as a position of 3.0 m, a speed of 4.0 m )ot)v4t nk;ka/s, and an acceleration of $1.0\; m/s^{2}$ . What is the kinetic energy (in Joules) at this instant?

  05.05: A box of old textbooks4uvl9oq j ; mqms;hcch v8n7 pz,/oo38 is on the middle shelf in the bookroom 1.3 m from the floor. If the janitor relocates the boxcq3vc ls8u q9,mzj;oohno8h7 p;vm /4 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 watts (abou;ylcv..3: tanfb mqmr2g m 3f)t 32 horsepower) of power to a car's driving wheels. If the car maintains a con.a mn ;cq.v gy3lmf:rb 2t)3mfstant 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 speed 5.00 m/s at c)2,ft(in : yfq ze4cdthe 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 leyc:)qetn c,(z2 dfif4ft 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 ezvj ty9; q ).ek;uqy7at the bottom of a rough, fixed inclined plane. The box slides with constant acceleration to the top of thtqy9 ve k)zj.7;eq;y ue 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 f8jdheu4h9sgpil 44 41wak vk4rom rest, along a straight road. CarA has twice the acceleration of Car B. After traveling a distance F, Car A has speed B. When Car hi4v4helpkk s9 w4j41g 4d8uaB has traveled the same distance F, what is its speed in terms of B?

  12.07: What is the net force acting p-0ngc/l: e,cfigne. on the object during the time interval of the acceleragnge,:c/0iln.c ep-ftion?

  12.08: Through what distance does the object move during tm 5:y :j. atiwiehj9u4he time interval of the aca 9ihijy:.m4:wej ut5 celeration

  12.19: The magnitude of the linear momentum of a 4.00 kg point mas fi,3f/m p0s 0rvo)ole0j fq;bs is changed from 6.00kg.m/s tjl);0bm3 ope,o/ q0fv sffri0o 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 a aq,8q)x5wvdincreased from 2.00m/s to 4.00m/s. Which one of the following choices best represents the mass of the crawq, qxa)v d5a8te

  94.38: A force F at an angle θ above the horizontalrtt *c 9pz0gj8 is used to pull a heavy suitcase of weight mga dist*90trzpc 8tjg ance 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 frictional force is:

  14.31: A toy crane exerts an ue+6i ir7uw ,1jv,y;/rm+pj qv,eicj ypward force and delivers a useful power output of 0.10 w to raise a blocuw+761i ;p rjeivmjyv/qjrye+,, c,i k 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 )nvo )x /zt9to0 okh-xar4l2ofrom rest near the surface of the Earth, the gravitational forc) o/to tx0nzv2x o9)-oh4ar kle 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 heldef3g3yx0 / eat motionless 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 energy E of the ball and its height h above the su3et afx/y3e0 grface?

  07.06: A 500-kg car is moving at 28 m/s. The driver sees a barrier aheadya a8gpw 5jf1rulo -c/qg 8;o2,woiftse u 86;. If the car takes 95 meo u8a81w68gyorij-,lf; /w a5quc 2to;fe gp sters to come to rest, what is the magnitude of the minimum average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s sldp)(a .f9 xrunows down uniformly until it stops. If the ball travels 19rdn ux)(.fp a5 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 kin..c+wecyppw0jm -uiv * j)rt (etic energies and the three following st*u. crtj p(-p)m+ciw w evy.0jatements. 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 vertically in the ai2 ydt6xc i,ar3imb /i0r with an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potential energy when it reaches its highest p 0d ci,6tymr3 ix2a/iboint?

  06.20: A boy jumps from rest straight upward from a fla l+brw66lvv- e ;w(nji4v7oueg0:raee s(oc9 t, stationary concrete surface. The boy, of mass M, leaves the concrete surfawrc 9l6e7(ai4lu(v w -jb;v o06 ns:eg rev+oece 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 iya -h7xh 4ny.nenem (88q-eu fs dropped from aheightH 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 magnitude of the average constant force exerted by the ground on the object whil. h men hen(4ynxf-qy 87ue8a-e coming to rest?

  12.48: An object of mass M is dro12 6lza*tbj rmpped from aheight H above the ground. The object bounces off of a horizontal surface in a collision lasting time T. The objectrm*jz1t6l a2b 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 sidew x/ q:ma2cto3says until the cord makess23q:o/mat cx 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, whic -kyen;vis))zb1fq1yi 28uk nh started at ;i)fe1ysb8zyi )-u kvnqkn 21 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 its original position at the bottom of the hill?

  06.09: A deliveryman moves 10 cartons from the sidewalk, along a 10u d,l3:iis lk+-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 total work done by the deliveryman on the cartons to mll,:+ikui 3sd ove them to the loading dock?

  12.16: A constant force F. rs1vll u5)qp* ubgn;z) fd(h=50N (as shown in the figure) is applied for the 6.0 meter motion of the box upward along the incline. The mass of the block is M5 lfr1bl pn;h)sz)q(uv. du*g=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 rest s mt g48ce).j3rkwqfzy /o39k 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 mechanical energies of themzgqkfc .9 84et/jy3kos3)rw two balls changing?

  11.28: A person throws an object of mass Mfn)1c08z1flyghh z s * straight upward with an initial non-zero speed v. The object rises to a maximum height H above the launch point. Tl11 zy g)hzh*f fn08sche 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 constant of 2. 1:m+r-qullijq bg-j9 gtl/huen4g 90 N/m. The.i lgt-u1qlbjgqgh:94 muj- n/ 9ler+ potential energy stored in the spring is:

  97.10: A compressed spring has 16 J of potential energyk,m1i z(vaj8 1w/crsdb s(m/n. What is the maximum speed it can impart to a 2.0-kb 8, j/andwsirm1(vc k/z1s(mg object ?

  

  10.31: An object of mass M starts from rest at the bottom of a fixed incline axxq*oi* 01 wzof 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 * zi qa0x*1xwoblock compare for the two trials? Assume the same constant non- zero coefficient of kinetic friction between the incline and the object for both trials.