97.01: A force F direcq(l is;p qha ta1tg;.9ted at an angle of θ above the horizontal is used to pull a crate a distance D acros( qat.;lq sig;at9hp1s a level floor. The work done by the force F is

  97.33: A softball player catches a ball of mass m, which is mi ts91r3fburb)o ,c/x oving toward her with horizontal speed v. While bringing the ball to rest, her hand moves back a distanced. Assuming constant deceleration, the hof1cb bi9r)/ut3 rs,x orizontal force exerted on the ball by her hand is

  99.14: A construction laborer m)em;5avfa b )holds a 20 kilogram sheet of wallboard 3 meter above the floor for 4 seconds. During these 4 secomv )e;a5b m)afndshow much power was expended on the wallboard?

  17.11: A 5.00 kg bl,fx;/xmh7xaqd f6 tghkp+w8 -ock slides with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictlyahtp g hw/qxmx76-d,kf ;8 f+x decreases 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 block slides with uniform accele:qji3pelo ;dsxo vu3) : .fkz0ration on a horizontal surfaiuqk ) :vj3xf se:lz0.3pdo;o ce 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 directed to the right is exerted on a 3.01 k32rv908pk t ny k 9lbu)lqg10fpxys kg block for 5.0 s. The block was initially at rest and slides on a horizonttl 193pr1n) ybxkglq2 s up09fv08ykkal 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.i q;*o,dr*)tt;kuwv yz+h m,q0 kg block for 5.0 s. The block was initially at res*;ui +w d ot),q;*vth kr,myqzt 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 ep3ni r tqf 487yaee)6reston a frictionless 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 directiop3ie8q reet)y 76 nfa4n. Which of the following correctly describes the above situation?

  03.14: A fan blows the air and gives it geq z/varypa7j 7dxojqu7.(3qo , 3x)kinetic energy. An hour after the fan has been turnedjuvq3 y)o37xjo7./pq ,(eqza7 arx gd 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 pojcz.4 v c)1izzsition of 3.0 m, a speed o. v1i cj)zzc4zf 4.0 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 texgdy/+s ij1g0fobg90 ntbooks is on the middle shelf in the bookroom 1.3 m from js0idg1obnyg f g/09+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. The box has a mass of 10.0 kg.

  02.32: An automobile engine delivers( dqqwab(2zg 5 24,000 watts (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 magb2g zq(w5q (danitude 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 the bott,)9xfwd j- h* ;mjmwypom 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 ofF = 240N. The box, of mass m)-fh*xj ;,wwmypj9d 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 up*tko3440 zi9 2gminri ms.yright, 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 force of s. 4ypoik2i9nt*0gum 4zrm 3iF = 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, 6861 p-rghoi0gcbu sy each starting from rest, along a straight road. CarA has twice the acceleration of Car B. After traveling a distan0s8hc bg r6u iyop1-g6ce 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 )t uc siu,xyf9964fjm acting on the object during the time interval of the accelerxc)y9tj ifuuf 46m ,s9ation?

  12.08: Through what dmm(j i529pbe yistance does the object move during the time interval of the accelerai92mj (p m5beytion

  12.19: The magnitude of the linear momentum of a 4.00 kg point mass is changed vjn,;uzm9zrq9(e rb* from 6.00kg.m/s to 14.0kg.m/s in a time interval of 6.00 s. b9 jmvezq9 r*rznu,(;What is the change in the kinetic energy of the mass during this time interval?

  14.11: A crate gains 36.0 J oxq4 7bl(nu 13l bmoox4f kinetic energy while its speed is increased from 2.00m/s to 4.00m/s. Which one of the following choices best represents the masom43l1ol( b4qxbu7nxs of the crate

  94.38: A force F at an angle θ above the horizontal is used t13 t nodorf7+zre+ 43pknhc,eo 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 suitcase is μ. The work done by the frictiordrnfp o +kz3n4oe3 t17eh+c,nal force is:

  14.31: A toy crane exerts an upw qu oh)h/-r3rlard force and delivers a useful power output of 0.10 w to raise a block vertically at a constant speed. At what con rh)hqol3 ur/-stant speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg object is released from rest near the surface of the Earde3/nl4-q3 ( 6 xoxrnt bub5gsth, 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 th ( xs5bdt3-4erqg3 ub6n lonx/e 1.00 kg object during the fall?

  96.18: A rubber ball is held motionless a height ho abox w8mzw2smcnk b6i zia2/+(1h ve a hard floor and released. Assuming that the collision with the floor is elastic, which one of the following graphb 2x1 wh2 wm+maikic( /n86szzs 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 moving at 28 m/s. The driver sees a barriex6irr6(2 xz y ;ldsp0zr ahead. If the car takes 95 meters to come to rest, what is the magnitude of the minimum average net 2zp6rix0(;zrx6 ldys force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows down uniformlya8a3oos0qf9 b until it stops. If the ball travels 15 meters, what was the average net force applied wh8faq ba9 3oos0ile it was coming to a stop?

  02.26: Consider two laboratory carts of different masses but ide +qm1 8ep7fy 38qp z+ zb,a0pbex6pxwantical kinetic energies and the te0qzzbpx3 , 76 pa8 wpeaqxm+bpy 81f+hree 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 tossed t7ufc: ahdl94 vertically in the air with an initial speed of 4.60 m/s. Ignoring aida9 l c74uf:htr resistance, what is the change in its potential energy when it reaches its highest point?

  06.20: A boy jumps from rest straight u;g,vizmr( zg 188l/et4 kl sfppward from a flat, 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 highes ptszeg;zr1kl (,4iglf 8v/m8t 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 drkzi-dduk t z3;nx7d 5)k8ipjo k-2 )0suo; hqropped from aheightH above the ground. The object crashes int-)dtk; kxq 7)puzi3ooud-h zrjki;s n8kd5 02 o 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 while coming to rest?

  12.48: An object of mass M i y) rsg710iblfs 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 ma)i f ysl1gb70rgnitude 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 the cordubsbq3* sw0 o( mbq0swsub* (o3 akes 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 eu-q+t 6bkh-x su2jy2 sled, which eyj6hs-u+2k 2x btu-qstarted 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 position at the bottom of the hill?

  06.09: A deliveryman moves 10 cartons from the sidewalk, an)zrp1 reb 83blong 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 to move thb z p)r3ne1b8rem to the loading dock?

  12.16: A constant force F=50N (as sh32hli* lw.xi uown in 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 repres*h3 iil2. uwxlents the work done by the force F onthe box for the motion?

  04.48: Two identical bowling( yjcz foiyiq5bxr )5f7 h4/d, 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 c5i5bzf qif4ryj,(hdx y /o 7)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 ; t( u8okgr()kefsu2 2 ny.zaian 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 rif ogk8s .ru(te2)ky;na( i2zuse above the launch point? Ignore air resistance.

  96.20: A force of 10 N stretches a spring that has a spring constant of +tcn5a 2qydu+ 20 N/m. The potential energy yc+ qa5ntdu2+ stored in the spring is:

  97.10: A compressed spring has 16 J of potential energy. What is the maxi)i 8l ol,na4c5ndt- okmum speed it can impart to a 2.0 k84)n5, ldo il-acont-kg object ?

  

  10.31: An object of mass M starts from reeag n58ho- ycto9*,jest at the bottom of a fixed incline of height H. A person decides to push o t-ech8*ea,o9g5j ynthe 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- zero coefficient of kinetic friction between the incline and the object for both trials.