97.01: A force F directed at an angle of θ above the horizontal is used to pul ,ke7 ub fp5q p7*xo93pht3as+1 emp46sumklml a crate a distance D acro5 bs a o7uku6kt4h*q pmm eslp3fep1,m7p x+39ss a level floor. The work done by the force F is

  97.33: A softball player catches a p3(c)ycoc hny9(py9 hball of mass m, which is moving toward her with horizontal speed v. While bringing the ball to rest, her hand moves back a distanced. Assuming constant deceleration, the horizontal force exn hcoc )9yp( hp3y(y9certed on the ball by her hand is

  99.14: A construction laborer holllipz/e 2(x mt89*qy ads a 20 kilogram sheet of wallboard 3 meter above the floor for 4 seconds. During these 4 secondshow much power was ex /8ia9t*e q2zmlp (lyxpended on the wallboard?

  17.11: A 5.00 kg block cc7 vpwnm.m ,5 slides with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases wm.p 7cv,cm5n 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 unif0 wbnkkvm843m.xg a p8orm acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 J in this 30pv88.w4kbmm gaknx 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 directedm sr1u jij(i0esc 2w2gmhtkw2 ,1,vm0gl3uu3 to the right is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and swi m3m0c 1 kv 12,gs3juwjhugl(2surt mi0,2elides 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 exer( e:cdf;qf)qpted on a 3.0 kg block for 5.0 s. The block was initially at rest and slides on(d:p)cqe; f fq a horizontal surface.
What is the kinetic energy associated with the block after the 5.0 interval?

  00.15: A student initt(zo, qfxm 4v.ially at reston a frictionless frozen pond throws a 1 kg hammer in one direction. After the throw, the hammv.mqz ot4,xf (er 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 9 6vm:swh trjqjvu r-43( qh5tair and gives it kinetic energy. An hour after the fan hjt6- :t h 39v(qu hjw4msrq5vras been turned 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 position of 3.0 m, e/w n0yx/wfd0 a speed of 4.0 m/ nx f/dw0/wy0es, 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 bookroofr,fhtrnt a:mg2 3k+ .m 1.3 m from 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 mr3.rkgth:f2t ,n+ afmass of 10.0 kg.

  02.32: An automobile engine delivers 24,000 watts (about 32 horsepowe vw tsc2 d3p2/,9qh.p3ug w 80iyguzvrr) 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 magnitude of the rct s2ph/w,uwg830yzg vp2ri9 du q v.3etarding force acting on the car?

  09.13: In the figure to the right, xzw7:dquxa9* 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 constaq*7:x dw9zua xnt 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 pb- etidtdgx+ r7*:( ,zbrs/ fspeed 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 wi*f gxrp+:/e(bdtt, zisr7db - th 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 )wf8-tp (g:vyi smjyprr; )f3to the right, each starting from rest, along a straight road. CarA has twice the acceleration of Car B. After ff(;-pyr v)r wtg)py : m3s8ijtraveling 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 1w;1zg 9p5dcmmsx2 ypof the accexypgwm m1 dc s;12p59zleration?

  12.08: Through what distance does the object move during the time interv(.; pv9mf6v+wmw yzn zx5s-jsal of the accelerazfn6xjszm .v( s9v ;mww -+5pytion

  12.19: The magnitude of the linear momen,si3afn (-; /*rngwrf c*qd mutum of a 4.00 kg point mass is changed from 6.00kg.m/s to 14.0kg.m/s in a ti*qg n(wru s,frc/*3- mnadfi; me interval of 6.00 s. What is the change in the kinetic energy of the mass during this time interval?

  14.11: A crate gains 36.0/8u l bx)1giuk J of kinetic energy while its speed is increased from 2.00m/s to 4.00m/s. Which one of the following choices best representb)/l ku8 u1xigs the mass of the crate

  94.38: A force F at an angle θ above the horizontal is used to pull a hez dr-m01rp 3lbavy suitcase of weight mga dis3r0-zbm r pl1dtance 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 force and delivers a useful powe+f -+8qgdgye mm: pja73xv gvx.n-7h qr output of 0.10 w to raise a block vertically at a7+xamvg3hq+qgx: e mjvdp.y-fg n78 - constant speed. At what constant 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 Earth, *e p2xhyfimd13ogl /++m / mffd.t*zathe 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 b*+/2omz1eap* df +gffl/t h xmyid.m3est 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 hard floor cuf46z q:wnm 1and released. Assuming that the collision witfw u1n:m4 z6qch 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.f3dn)2l4ofxc(uvn z6 If the car takes 95 meters to come to rest, what is the magnitude nfu cv)n fz246oxl3d(of the minimum average net force necessary to stop?

  00.26: A 500-gram ball mb u*b 2o-ies.-rh9faaoving at 15 m/s slows down uniformly until it stops. If the ball travels 15 meters, what waour as- * b.9h-efba2is the average net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of different masses buu4:8)u5hin giwui2-m2zy ivit identical kinetic energies and the three following statements. Which of the above sta :zw-iimig)yv8ii22u4 5nu h utements 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 tosse rzo9 i7/,qpsk 1h4huld vertically in the air with an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potential energy when it reaches its higilsq,/h7491o krhzpu hest point?

  06.20: A boy jumps from resyu/ktas77 db;t straight upward from a flat, stationary concrete surface. The boy, of a77dy sk/ub ;tmass 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 massdv*sm6q 68o/cbr ek7treo r4 5 M is dropped from aheightH above the ground. The object crashes into some soft earth and comes to d 7ebc64vte5r or/q 8k*srm6orest 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,1jp6,ln e5 u0awd xzu aheight H above the ground. The object bounces off of a horizontal surface in a collision lasting time T. The obju lz aejnx0, 65wup,1dect 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 side onqro** ;mx/zways until the cord makes ;/rzm oo**xqn 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 upkhpkad d0lj(e,d9v8z)q(k tv +-lai 5 a uniform incline of unknown angle. The sled, which started at the bottom (0akla pkk,q8 5 9zvv+d)-ld jed(t ih 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 thh4-c 8ym (bvsge sidewalk, along a 10-meter ramp to a loading dock, which is 1.5 meters above the sidewalk. If each carton has a b(84-scmgvyh 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 forznad7f :8z0l xx ua)/fce F=50N (as shown in the figure) is applied for the 6.0 meter motion of the box upward along the incline. The mass ofx 0fldzxuf aa8)/:7 nz the block 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 dropped from re;h s/6ko* j8c t8td,ob6l flesst 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, hofk/6sljt ,;8hetcsd o b8l*6ow are the mechanical energies of the two balls changing?

  11.28: A person throws an object of mass 1jqr cbexu-;9x tj6*wM straight upward with an initial non-zero speed v. The object rises to a maximum height H above the launch point. The person n;61* eb9qj wtxrcxu-jow 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 haq/*3yfcg0xd i+)jdi fs a spring constant of 20 N/m. The potential energy stored in the sprigj+ q3/)f *0cif dydixng is:

  97.10: A compressed spring has 16 J of potential energdd9e+xy *h jt.)+layjy. What is the maximum speed y e*txdly.j) h9+aj+dit can impart to a 2.0-kg object ?

  

  10.31: An object of mass M starts from rest at the bottom of a fixed in +tq:sku x/u8c*mzbw 7cline of height H. A person decides to push the objek zxs78q:bt m +*wcu/uct 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.