97.01: A force F directed at an angle of θ above the horizontal is usedjce:kwm, kp,cu3; jx, to pull a crate a distance D across a level floor. The work done by the force F i xkuej c, k,3p;:jc,wms

  97.33: A softball player catches xy ;agc4e 4ho6jpn r6(a ball of mass m, which is moving toward her with horizontal speed v. While bringing the ball jn64oeha;6r(gcx4 p yto 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 laboxi sd l7*.;wborer holds a 20 kilogram sheet of wallboard 3 meter above the floor for 4 seconds. During these 4 secondshow much power was;.* swdo ix7lb expended on the wallboard?

  17.11: A 5.00 kg block slides w efjboz48ft,v:hx v,: ith uniform acceleration on a horizontal surface for 5.00 s. The block’s kineti,8 o:ffjv hv, zbe:4xtc energy strictly 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 unul+dnlftp.m fy+;e ;.iform acceleration on a horizontal surface for 5.00 s. The blomp ;l. ft+ nl;eudf.+yck’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 wb:zq)mwq ; ixe(l 7zkto l0j6t17t8i 3.0 kg block for 5.0 s. The block was initially at res t kq86:wxt7 ioezq7j z0)l(; 1ltwbimt 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 force directed to the right is exerted on a 3.0 kg block cm,g flnk/, r4for 5.0 s. The block was initially at rest and slides on a hornl,,m4c/ gr fkizontal 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 qhoot 7p0e0 5dul *pv7(es8urpond throws a 1 kg hammer in one direction. After the throw, the hammer moves off in one directiorplo0 odv tp7s08hq eueu 7(*5n 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 gives it kinetic energy. An houm/lquqzj m -xv;(x:xul): eh7 r after the fan has l- m:qjq) 7v /: uezlx(hxmx;ubeen turned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a blocut /au5x3i l;ck of mass 0.50 kg has a position of 3.0 m, a speed of 4.0 m/s, and an acceleration o5 x;ai/lu t3cuf $1.0\; m/s^{2}$ . What is the kinetic energy (in Joules) at this instant?

  05.05: A box of old textbooks is on the middle shelf in the boo8m:b/ dzvyk qoq- m8w9kroom 1.3 m from the floor. If the janitor relocates the box to the shelf that is 2.6 m yqwz -88q dvmo:/mb9kfrom 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 (about 32 horgh2pr4wm../ s bwl9uwsepower) of power to a car's drivbg.2 sw9l4/hw m.rpuw ing wheels. 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, a box moves with speed 5.00 m/s5v0e)wt4r.kq(o uf ul at the bottom of a rough, fixed inclined plane. The box slides with constant acceleration to the top of the feulu w40ok. q)trv(5incline as it is being pushed directly to the left 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 at the bott6bggzt 35r .nuom 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, of ma.6nb3zg5r gu tss 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 p1gbwjao*cb5vpj77 3v l;s4ostarting from rest, along a straight road. CarA has twice the acceleration of Car B. Afte3;bp7vl4 o cowjb5 1vs*ag p7jr 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 during the time interval of tl ;e3 opzfrf1ua 4f/0nhe accelerap ;3f4fefaz l 1ou0nr/tion?

  12.08: Through what distance does the object move during the time ino 6debsf +4:msterval of thef ess4d+m6o:b acceleration

  12.19: The magnitude of the linear momentumqv;p71 +nyz7s3b asrwkz63ct of a 4.00 kg point mass is changed from 6.00kg.m/s to 14.0kg.m/s in a time interval of 6.00 s. What is the change in the kinetic energy of the mass during this tim3kryvzs w cs+zqpb6 3 7ta;17ne interval?

  14.11: A crate gains 36.0 J of ki/6pi huf889fpwup lz 5netic energy while its speed is increased from 2.00m/s to 4.00m/s. Which one of the following choic8l5u 9p6hzuiw ff/p p8es best represents the mass of the crate

  94.38: A force F at an angle θ above the horizontal is u,9hnyxek; )w zsed to pull a heavy suitcase of weight mga distance d along a level 9w ;yk,x )enzhfloor 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 fcd5 3kxj1s8h*,7st-vygq vv borce 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 kg h,gv-8t7dyv xj* scq1s bv k35block?

  12.18: A 1.00 kg object is released from rtlveg01 1eq 8gest 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 the following choices best represents the amount of work done by the gravitational force acting on the Earth by the 1.00 kgg l tv10egq8e1 object during the fall?

  96.18: A rubber ball is held motionleks a:g8,zg0lb ss 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 relatio:,8a l0kgs bgznship 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 barrmijs+ db;i;5a 5ljj6 vier ahead. If the car takes 95 meters to come to rest, whm55j;al+b ; isd6 ijjvat is the magnitude of the minimum average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows down uniformly until it stops.1o1h :: ygxxz1*zprb1u3h* zh q,uahi If the ball travels 15 meters, what was the average net force i:z,bxr h3hh1z pz ougy*h11q1 *ax:uapplied while it was coming to a stop?

  02.26: Consider two laboratory carts kn: x(s;eq.fb of different masses but identical kinetic enerfqs :xe.k;nb(gies and the three 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 vertically in th+ nhr)2rsy aw6e air with an initial speed of 4.60 m/s. Ignoring ai2r+hsrn6y wa) r 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, suemk3h v6bb+2tationary concrete surfac32mb6hv+b kue e. 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 concrete do on the boy?

  02.48: An object of mass M is dropped from aheightd .9:4 qi6 7:0ruhfea7n4 fsmoruwvluH above the ground. The object crashes into some soft earth and coowv.ah:uu4l rrsnf9feiqd:6 74 um07 mes 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 is dropped from aheight H above the ground. The objexsfpz3kq e2 m2yo1 )n/ct bouncnof z21yx/2kmps e) q3es 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 cor56zb*v8rl74 ds:hlbbb qy+gw d length L is pulled sideways until the cord makes an 4+bzq58 l*d:s6lg brw hbb7yvangle
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 unk8ciy+ei 2/vnhb3 yr9enown angle. The sled, 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+v i r/yiec32ehynb98 when it returns to its original position at the bottom of the hill?

  06.09: A deliveryman moves 10 cartons from the shqk 1kq9c-1swujl5 do 3 rqn6e6b11mjidewalk, 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 totwnduj1srq65 cq oeql9 -m6kb1113 jkhal work done by the deliveryman on the cartons to move them to the loading dock?

  12.16: A constant force F=50N (as sn8 ed*sjw:gur/l:xle s,z8x) hown in the figure) is applied for the 6.0 meter motion of the box upward along the incline. The mass of the bl *:, /g ud e)8nejxszxwl:s8rlock is M=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 droppvd* h*qek3jk8u vin f9y1iy; 9ed 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 thkv i;hu31* ie9f9dvjy*8ynkqe two balls changing?

  11.28: A person throws an object of mass M straigh4xubpxk6st 1 -t upward with 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 -uktx bps64 x1of 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 t*s(gyuau 1 n-a spring constant of 20 N/m. The potential energy stored in tt ug1sa(-nyu*he spring is:

  97.10: A compressed s0 /t0 qqub:au6o8azrf pring has 16 J of potential energy. What is the maximum speed it can/q6a 8fb u0:q0r zauot impart to a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the bottc;82w3rfthup oyxg 0 c;t, w5nom of a fixed incline of height H. A person decides to push the object up the incline chy owfr8;;cp5t,03x wtnug2in 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.