97.01: A force F directed at an angv5m :w(h wm: qw;(fohxle of θ above the horizontal is used to pull a crate a distance D across a level floor. The xm:hw wwf( hv:q5;o m(work done by the force F is

  97.33: A softball player c3ed(u m kp8)yiatches a ball of mass m, which is moving toward her with horizontal speed v. While bringing the ball toi8u mk(3pde )y rest, her hand moves back a distanced. Assuming constant deceleration, the horizontal force exerted on the ball by her hand is

  99.14: A construction laborer holds a 20 kilogram sheet of wallboar1zoo8n f3o1bms,rbu w1c-, jvd 3 meter above the floor for 4 seconds. During these 4 secoovju ocm1, ,3 w -r1z8b1sbnfondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform acceleratioaw4 ) 8sw,7 u;ys+iz:t2kt8fafup ohon on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases fromustz,u 7;8ws) 4i t+h8ayoaw 2f:pfo k 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 sliv5s1p+ys1k uf des with uniform acceleration on a horizontal surface for 5.00 s. Theuf+ 1ys1 svkp5 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 to the right is exerted on a 3.0 kg blocrrcu e1:aj t99zvvtb) xh9:1 ek for 5.0 s. The block was inia1xr: 9uv 9ejtcht:zv9e1 b)rtially 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 for 6a69lqoa3gxlce directed to the right is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest g6oal6a 9l3x qand 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 1jt,aa3,1vqpd((tv)3q x rxg l kg hammer in one directiorqpaq 1 ((x3jx 3,,tvg)dlvatn. After the throw, the hammer moves off in one direction while the student moves off in the other direction. Which of the following correctly describes the above situation?

  03.14: A fan blows the air and giv 9n9 k;g*gjl ,ne3dpni-aitt/4(rutd es it kinetic energy. An hour after the fan htk-pnijnng d4a(d e9 9r;*,g3 l/ittuas been turned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of my/cdn z7/jc ,oass 0.50 kg has a position of 3.0 m, a speed of 4. /d/yo,zc7cn j0 m/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 textbooks is on the middle shelf in the boofal/i .zq5vu:kroom 1.3 m from the floor. If the janitor relocates the box to the shelzq 5 lfa/i:u.vf 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 enfmb4)n2wjo,;nodkt;*lha 4e gine delivers 24,000 watts (about 32 horsepower) of power to a car's driving wheels. If the car main,2wm4fe ko4h ;b*an)j dntl;otains 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, a box moves with speed 5.00 mzrw6;xu4 ( gk isbv7u+/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 wiburkvisw+ zg746u (;xth 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 (u.sewcl.vnv y w170 oc;xat8 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 vn al8twvcsw;..(71e yxoc0ubeing 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 starhelh d l y3o55flv.z(.2ww -uvting from 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 B has traveled the same distance F, what is its speed ihlw . v(l3ow5fd -u 2ev.hly5zn terms of B?

  12.07: What is the net force acting on the object during the time interval of :hh1z v2km 9 o hv/m*istk95ckthzt*9/okmskh 2hv9cv m 5kh1: ie acceleration?

  12.08: Through what distance does the object move during the time interval rrma6.l am(w5of the accelera(wl6m. 5armr ation

  12.19: The magnitude of the linear momentum of a 4.00 kg point mass i36 wpg2j;gh nqs changed from 6.00kg.m/s to 14.0kg.m/s in a time interval of 6.00 s. What is the change in the kinetic energy of the mass durgwqnp2jg; h63ing this time interval?

  14.11: A crate gains 36.0 J of kinetic energy lw)sykd/eji*;ey0sr 6 z l:4dwhile its speed is increased from 2.00m/s to 4.00m/s.r*w zy4dd;:y6 i l)/0esljkes Which one of the following choices best represents the mass of the crate

  94.38: A force F at an ang(vq/ ag,s sbag21n8wy x- q;skle θ above the horizontal is used to pull a heavy suitcase of weight mga distance d along a level floor at constant velocity. The coefficient of friction between the floor and the sui ,ns vsxasgk(y8gq/2b1a -wq;tcase is μ. The work done by the frictional force is:

  14.31: A toy crane sl;t30kfm ;f p b884pv -l3ovcew e9dhexerts 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 will this crane raise a 0.20 ke sl; lovpc-9bv;h803m84 wf 3k dtpfeg block?

  12.18: A 1.00 kg object is released frmc+xrcn7 p7h6z 7 6- 2lin)apfz6 deouom rest near 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 thezi+rcu7h) 6p 7d m 2fn7xn6e6lozc p-a 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 ho above a 4v2tid,ma)ee byr 5-hhard floor and released. Assuming that the collision with the floor is elastic, which one of the following graphs best shows the relationri4)hb2e, dmte5ay -vship between the total energy E of the ball and its height h above the surface?

  07.06: A 500-kg car is movinq rv. czrrcql1 wgj o:tg(,bw1/. h)gya95xu:g 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 minimum average net force necessarrtv:5.w1q,.r1 wgzhbrcql ux)(yaj gog9/ c:y to stop?

  00.26: A 500-gram ball moving am c, s:m/ n+qsr,etcs6t 15 m/s slows down uniformly until it stops. If the ball travels 15 meters, what was the average net force applied whsm, tqnccm6e,s: + s/rile it was coming to a stop?

  02.26: Consider two laboratory carts of different masses but ide; 4 ehexn x982n fi9qcekms6r/yka,p7ntical kinetic energies and the three following statements. Which of the abcqk ns4f/ape76; ye2i nxr ,emk9 98xhove 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 tgnxtb 9w1-4ic+fy ;6t :ijnkvhe air with an initial speedwfi6vnj+ 9it gyxbk c:;n4t1- of 4.60 m/s. Ignoring air resistance, what 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, stationary -tv a(:ii(4wkg.u3t.cmwe6p o) g alaconcrete surface. The boy, of mass M, leaves th 4ti)m. p6(wk.i(c avu-:tglg3w aeoae 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 ah1rg dzeh1.zx 2bz9,vjcg -ry*eightH 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 mg1vrj crzxg1d*y- .2 z9b,ezh agnitude 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 akc / 1eohhvvzl5ai f .)98mc:zbove the ground. The objec5f9. :ma)/vizvohe h kzc8c1lt 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 mass during the collision with the surface?

  96.38: A pendulum bob mass mon a cord length L is pulled sqt 3f / *k/pqfv xn7nqkzs;b4,ideways until the cord makes/vf/q btnf7;,* knkpzx s qq34 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 u5uansqnq+s8tj5; pyh ik1 9 2kp a uniform incline of unknown angle. The sled, which started at the bottom of the incline moving at 10.0 m/s, rises to a height of k p; n+htq5ay2sis1ku89jn5q 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 froa :dc 8uv84oi;(hexxbm the sidewalk, 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 total work done by the deliveryman on the cartons dv8a(i8h;b 4:xuoexc to move them to the loading dock?

  12.16: A constant force F=50N (as shown in the figure) is applied for the 6.0 medet svi0i w1j luq,5u/t)k-8nter 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 bt t-nkv,)w/ q 5d8u01lijseiuy the force F onthe box for the motion?

  04.48: Two identical bowling balls A and B are each dropped from res4xcf .-xeg2tvxm)h7 w t 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 bal t4-.xmgw)27vxh c xfels changing?

  11.28: A person throws an object of mass M strai5 oa)d uq:x xt)y1xpo7ght upward with an initial non-zero speed v. The object rises to a maximtuxp7q:5 )o o)xx d1yaum 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 rise above the launch point? Ignore air resistance.

  96.20: A force of 10 N stretches a spring that has a spring constant of + g)nahofmc-o7u k( ifyx:*;h 20 N/m. The poten fy h unm*c) ak(oixh7-gof;:+tial energy stored in the spring is:

  97.10: A compressed spring has 16 J of potential energy. Whatqekspv* e ut- .08-9mubp6le e is the maximum speepqev 8msbl* 6ep-0ut-.9uee kd it can impart to a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the bottom of a fixed inclvuo9xooq , r0r+. uav2ine 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 th x.ur9avq 0v2u ,ro+ooe 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.