97.01: A force F directed at an angle of 1jj ioic u rf 23wpu332t+ah*l θ above the horizontal is used to pull a crate a distance D ac*c 23+jiu o jhp3f i2urtwa3l1ross a level floor. The work done by the force F is

  97.33: A softball player catches a ball of mass m, which is movingq e jc;x01pl ln.20wlexr8ur4afn3-y toward her with horizontal speed v. While bringing the ball to rest, her hand moves back a distanced. Assuming constant deceleration, the horizontal force exerted on txnu03r0p8 jx4-2nw1.c qaef r;llye lhe ball by her hand is

  99.14: A construction laborer holds a 2ez4kc/,un ;bxua2e h-0 kilogram sheet of wallboard 3 meter above the floor for 4 seconds. During these 4 secondshow much power was expended on the w4- eunz,u cbxea2h;k/allboard?

  17.11: A 5.00 kg block slides with unifw6df7zvm tqds05+lgt 8n s*,p orm acceleration on a horizontal surface for 5.00 s. The block’vn 8dms5zt06*+p7f ,swqgdtls kinetic 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 uniform acceli 3b9 ;pr mouo*) .uu:vnsn:im6+lyo keration on a horizontal surface for 5.00 s. The block’s kinetn+ onkml; b6rpv) umoiyu.9us io:: 3*ic 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 direct1s2 9 i5. futdqq(mz-8nim amwed 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 surface. mq( i18 -mmtqfzuad2w. s5ni9
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 blomquu l8 -7zni,s1g u4nd2bz2s ck for 5.0 s. The block was initially at rest and slm1 l8zn4 22ugbu,-qssz7din u ides 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 po-o20s;wb j zpbnd throws a 1 kg hammer in one direction. After the throw, the hammer moves off in one di-w2bz o0bjsp; rection 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 hon t-pk4o+0qnk ur after the fan has been turned off, n +-tko0 nqk4p
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block of mass 0.50 kg has a position of 3.0 m, a s*kowz1t4cp+x5(w vj( b yb0 t* i8bpzhpeed of 4.0 m/s, and an acceleration ok +zto5tbp(b 1iz*j (8 hpw4cwxvb*0yf $1.0\; m/s^{2}$ . What is the kinetic energy (in Joules) at this instant?

  05.05: A box of old textbooks is on the middle shelfv:ia1u*h ,4h zykix 4y in the bookroom 1.3 m from the floor. If i h y41xa*v,:hyuz4ki 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 4bpymrwn :,9fdelivers 24,000 watts (about 32 horsepower) of power to a car's driving wheels. ,p49r mb :wnfyIf 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 5.0h2)l hvs-qa 9p0 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 wi2svahpq)9l - hth 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 bc bkz.l g)6.-xc9:zmuwxzz q2ox 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 bexx).zz.q gz6c 9-wk:bc2umzling 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 from rest, alon; r2cjek3p6g gg a straight road. CarA has twice the acceleration of Car B. After traveling a distance F, Car A has speed B. When Car B hagg3kcr6;pj e 2s 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 t worix0. n/g4hpj1pg/ he ajp. pg gnoxw0i4h/ /r1cceleration?

  12.08: Through what distance does the object move during the time interv.8dg5 onhjukc*bw.l*:c .ft o al of the g5 *ou. wnbotdj f:.k.c8cl*hacceleration

  12.19: The magnitude of tht01-u wtbz4pea:f)u) q6jenp t be4i k ;m4d7xe 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 6.00 s. What is the change in the kinetic energy of the mass during thist 4epm;nujz1)74xbe6u-t:w d0k)4 beiapqf t time interval?

  14.11: A crate gains 36.0 J of kinetic energy while its speed is k 4k5 9-yfsrxbincreased from 2.00rf5y sxk kb49-m/s to 4.00m/s. Which one of the following choices best represents the mass of the crate

  94.38: A force F at a 10gu+8*vt0sf(drprdm( gbia n angle θ above the horizontal is used to pull a heavy suitcase of weight mga distance d along a level floor ap8ab f+1rd0u (g*(0r m gtsidvt 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 fcll e4ea3gco 0xdyh )1j 883lan upward force and delivers a useful power output of 0.10 w to raise a block verticall3ly)4 eah0 dxocg8e j8l c3lf1y at a constant speed. At what constant speed will this crane raise a 0.20 kg block?

  12.18: A 1.00 kg objectr bt1dqe p 4nt;6.sa egqz:6-m is released from 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 the following choices best represents the amount of work done by the gravitational force acting on the Earth by the 1.0 peq-6;bt6m.tasrgd:enq 4 z 10 kg object during the fall?

  96.18: A rubber ball is held motionless a height ho abovr44rcptl3.hsqv u4wh.8iov3mfh4 1 ;ym o3v de a hard floor and released. Assuming that the collision 8hy4.frvvth.o dlos4rc4p;mw 1m33 4iu q3 hvwith 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 moving at 28 m/s. The driver sees a barrier ahead.9f,-eci 8xji v If the car takes 95 meters to come to rest, , v-jiei9xc8fwhat is the magnitude of the minimum average net force necessary to stop?

  00.26: A 500-gram ball movo06h8vjk2qu + rv wbz)ing at 15 m/s slows down uniformly until it stops. If the ball travels 15 meters, what was the average net force applied while it was coming to a stop?8v 6o+2b krwu0zvj )qh

  02.26: Consider two laboratory carts of different masses but identical kinetjada let( ln w;5*l3v.ic energies and the three following statements. Which of the above stat . vllatej 3(dwa;l*5nements 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 air with an initiav:pd dkjlo,2h 9gq9 v.l speed of 4.60 m/s. Ignoring air resistance, what is the change in its potential energy when it reach.2hv:q9dogv klj, d9pes its highest point?

  06.20: A boy jumps from rest straight 1a nhe5)iegx 4upward 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 highest point of the motion. How much physical work did the average normal force of contact (N) between the boy’ s feet and x)g ia1n h4ee5the concrete do on the boy?

  02.48: An object of mass M is dropped from aheightH above13* yt9s2yk0 ino uydr the ground. The object crashuny102i s oy3tryk9d* es 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 while coming to rest?

  12.48: An object of mass M is wr3 qxha,f)0edropped from aheight H above the ground. The object bounces off of a horizontal surface in a colrex h w3)q0fa,lision 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 p.fvbjiwb0 (g2tp,ah 0ulled sideways until the cord makes i, 0gvabft( 2wbj.ph0an 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 unitq, pdgj 6 h.0q;3q( bmhxfr*:/vjnb known angle. The sled, which started at the bottom of the incline moving at 10.0 m/s, ritq6,qjnhdx; bpvf* .:q 0hg/br(i3jm ses 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 1lby 0.odtc*x5fnge dn(+ )cb:0 cartons from the sidewalk, along a 10-meter ramp to a loading dock, which is 1.5 meters above the sidewalk. If each carton has a ma(:cfcdl+bbt) g0d yne n5*. oxss 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 in the figure) is appliev mr cw0;4i9qk5;9tudwrriwi 8q 0jw :d 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 onthr4:;tdwqw mrw90ik9 uvc 8w0jiq r;i5e box for the motion?

  04.48: Two identical bowling balls A and B are each dropped from rest from the37l.g nuc))2kbzq x kd top of a tall tower. Ball A is dropped one second before ball B. After ball B is dropped but before ball A strikes thlnb k dx.qkc2)g u)7z3e ground, how are the mechanical energies of the two balls changing?

  11.28: A person throws an object of maqknxpvct :ojga0(:09* h. owwss M straight 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 p:(owxnv0:jt 0gkaqh*co w .9of 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 constai9ex)zy lbdi4 k 5 upq74)ggz-nt of 20 N/m. The potential energy storei yl) ikd4 qz74gxpu- e)g5bz9d in the spring is:

  97.10: A compressed spring has 16 J of potential energy. Wowbci nl2w xii4l3*7z2p71wchat is the maximum speed it can impart to a 2.0-kg objecwcxbw w iloc2l4 i21i73 *znp7t ?

  

  10.31: An object of mass M starts from reil)jl0wsv .z1x d9jivgbg, 34 st at the bottom of a fixed incline of height H. A person decides to push the object up the incline in one of two ways with an applied force shown ix3v90l4vs .,bgzgw l1 jd ij)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.