97.01: A force F directed at an angle of θ above the horizontal is used to f)xks1c9fcoe +,lwr 5pull a crate a distance r e5,fxk s91+wf)colcD 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 toward her w(cp cls ;6xfag,bo 06nith horizontal speed v. While bringing the ball to rest, her handflo0pga; ,b( xn6c6 sc moves back a distanced. Assuming constant deceleration, the horizontal force exerted on the ball by her hand is

  99.14: A construction laborer hold,cc ksvwc l 1wpx*/3e)s a 20 kilogram sheet of wallboard 3 meter above the floor for 4 seconds. During these 4 secondshow much power was expended on the wallbkec c3p/cv*ws ,lw1x) oard?

  17.11: A 5.00 kg block slides with uniform acceleration on a horizcjz+z685v9 pe)sa.uhqg1apg ontal surface for 5.00 s. The block’s kinetic energy strictly decrep6+eqa hc1 9 zj)pu5g zagv.8sases 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 blf.u m1-a6r* bozh.lq vock slides with uniform acceleration on a horizontal surface fob-l1a u mzrf.6vq.*h or 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 directed tpi /di*2m2jpm g*xv2 5as -ur58rjlkn o 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 surface.r rsmm gx*5-l2u5k2j* v jpdi8pn/ ai2
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 /bu,+tef9lug on a 3.0 kg block for 5.0 s. The block was initially at rest and slidesbfluu /tg ,e9+ 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/; qedpj ,cm6o r6,f i+qkkc8irqv+0i 1 kg hammer in one direction. After the throw, the hammer moves off in one direction while the student moves oqjqcp ckrv ,oekmq6/ +80d i6;fi +i,rff in the other direction. Which of the following correctly describes the above situation?

  03.14: A fan blows the air and gives it kinetic eneroxzlm; y + 6 /(nj; -ctv8o/ann1sylpkgy. An hour after the fan has been turned( ytjon+s 1 l/n/ yo;k6z-x vl;nm8cpa off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block ofeuls6 mr(7 :t o3;m*jyajpo/t mass 0.50 kg has a position of 3.0 m, a speed of 4.0 m/s, and an7 /j ms t o6;a:jm3rut*pol(ye acceleration of $1.0\; m/s^{2}$ . What is the kinetic energy (in Joules) at this instant?

  05.05: A box of old tse; ctzu6)i5eextbooks is on the middle shelf in the bookroom 1.3 m from the floor. If the janitozts56) e iu;ecr 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 watts (aboutg1nmj 7d.13 (kn kxd9 agyg/zs 32 horsepower) of power to a car's driving wheels. If the car maintains a constan kn1ds1m.ny gjaxd(gzk 39g7 /t 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 morih5ra e;h/nx *3ial*ves 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 constantrrnhiia;35e*ah*l / x 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/h z0i:q8oy:lii(0sqxza w11k 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 force of F = 240N. The box, 01z1saiiq:iwh y0 :o8 kqzx(l 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 startinihrnob* / x+o:g from rest, along a straight road. Carxr o+ib* :/honA 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 is its speed in terms of B?

  12.07: What is the net force acting on the object duz6xn(cycdb22 w6s sw (ring the time interval of the acces(zy dcbws6x2 26 nw(cleration?

  12.08: Through what distance does the obje8yg /1:myc2ax+znq vfct move during the time interval of the acceleyacvz gx8/y1:2 q+nmfration

  12.19: The magnitude of cn3qt8n;2i rt the linear 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.i3ntrqcnt;8 200 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 t,dm(v*7tez- et oq(dits speed is increased from 2.00m/s to 4.00m/s. Which one of the following cd7 *meqz-t ((oet t,vdhoices best represents the mass of the crate

  94.38: A force F at an angle θ above t4tgfar),0l z- 6ofbi fhe horizontal is used to pull a heavy suitcas0 -fi6)t4zalro,bg ffe 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 by the frictional force is:

  14.31: A toy crane exerts an upward f, l 7dct:cp-+n)fqjhlwzh - c2orce and delivers a useful power output of 0.10 w to raise a block vertically at a constant speed. At what consthcw- 7n2j:pl-) qlfh ct+c, dzant speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is released from rest neak;alchx drd+k qiw9/;) +iyvyj 8ws83r the surface of the Earth, the gravitational force acting on the 1.00 kg object by the Earth does 10.0 J ofk;r)q yy;8 dcwkv+3 s8ilj/ +9h xdwai 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 zdb i2txm7mk)i1 v )s3held motionless a height ho above a hard floor and released.)bi2dvsktmm 1 i3z)x 7 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 surface?

  07.06: A 500-kg car is mov e 95kifx gc:3zz0fhd;ing at 28 m/s. The driver sees a barrier ahead. If the car takes 95 meters to come to rest, what is the magnitude of the minfc:3z 0 kzhgfd;ei 95ximum average net force necessary to stop?

  00.26: A 500-gram ball moving lt l,faf+naq1of 4.( fat 15 m/s slows down uniformly until it stops. If the ball travels 15 meters, what was the average net force applied whilofln f af t(.l,14+faqe it was coming to a stop?

  02.26: Consider two laboratory carts of different massesnpmiw;0+mkw9yqs *w/ but identical kinetic energies and the three following statements. Which of the above statements wq9p/swym; +m w kn*iw0ould 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 tokr;+/0d5 dgho jo bxx7ssed vertically in the air with an initial speed of 4.60 m/s. Ignoring air resistance, +h ;x7xord o/jb d5kg0what is the change in its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straight upward from a flat 87,6 5ixlnkbkos5tf (hyl)tee-(gg d, 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 concretego bl)ef5y t(dxl6ig5k,thneks(- 78 do on the boy?

  02.48: An object of mass M is dropped from aheight9khwhi 78r9wpvjg3: j+ v t0ugH above the ground. The object crashes into some soft earth and comes to rest by compressing the earth a distance of H/2. Assuming + h3 wuj 7 9jwh:i0kv8rtg9pvgthat 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 4 /kq 3f( opdh,48 xvkgzhxqj-gn9t:kfrom aheight H above the ground. The object bokn4hq4j do8x,fkv:kgp / xt(3 zh9g q-unces 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 mass during the collision with the surface?

  96.38: A pendulum bob mass mon a cord length L is pulled sideways until tdih;* rv 0-abzhe cord makes an az*bvia0 d- r;hngle
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 sqd8h8)rm+/5cslm wpf /9luk uled, 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 is the sled's speed when it returns to its original pmwrh/f9ml /k58)u sq8+dulc position at the bottom of the hill?

  06.09: A deliveryman moves 10 cartons from the sidewalk, along a 10-meter c2.1:/nhpbnj7 qhkdk b,y qfs ,m +f.eramp to a loading dock, which is 1.5 meters above the sidewalk. If each carton hasbmq kd: 7/eshqfj n.+, pf,y2n.h bkc1 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 nsp :eyw,j4kp-* s.thin the figure) is 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 onthe box for*pep ., h sjykwt4s:-n the motion?

  04.48: Two identical bowling balls A jya 2fg(yu fzmi,7a(yq2;ut 6and 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 mechanical energies of the two ballsfaj2z,q (gf yay7y muut(;2 6i changing?

  11.28: A person throws an object of mass M straight upward wi ts0f-af9q+ ::jxljqs7z g w2uth 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 ris+jf-9 jsl: ga:sftqu07w qxz2e above the launch point? Ignore air resistance.

  96.20: A force of 10 N stretches a spring y5isf,;pank7n6d1 sef: ax2u that has a spring constant of 20 N/m. The potential enu7nya, 16:s fied2;k5 fxapsnergy stored in the spring is:

  97.10: A compressed spring has 16 J of potential energy. What is the maximum spt:pwub0he.+ ovu;u(q eed it can imo u :uteq+p. wu(hb0v;part to a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the bottom of a fixed inhouuu6v1al6zh.0pg dz . 2/v fcline 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 theu zo ph0.a/6z6 ugf2u.lvv1d h 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 friction between the incline and the object for both trials.