97.01: A force F directed at an angle of θ i bv.yu*86vp;aqe6ru0v j6acabove the horizontal is used to pull a crate a distance D across a level floor. The woreu*q8vv0jib6v6; c6uay rap. k done by the force F is

  97.33: A softball player catches a ball s3 2bu.inyfk (of mass m, which is moving toward her with horizontal speed v. While bringing the ball to rest, her hand moves back a distanc2.3b s(nifk uyed. Assuming constant deceleration, the horizontal force exerted on the ball by her hand is

  99.14: A construction laborer holds a 20 kilogram shbrlhe39* 7d/5*b z5ljwg b5b2wrbz m xeet of wallboard 3 meter above the floor for 4 seconds. During these 4 secondshow much power was expended on the wallboardr w/ r w*z2egbmdzbj5x3ll9* b7h55bb?

  17.11: A 5.00 kg block slides w8:6wig(r0zn gnlv++mymh 2ryith uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decrea +nn2r6 mlrv8 wmiyg+yg (0hz:ses 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 wi)sp hqq-g1u-ith uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases froq-s)iq u h-1pgm 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 b(lft,v ms5ww 0lock for 5.0 s. The block was in, 0(lwtfvws5m itially 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 force directed to tv 39imw;y/ykzhe right is exerted on a 3.0 kg block for 5.0 s. The block was initially at rest and svw9y ;ki/3zmy lides 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 throws1c2sgex8t4 u s a 1 kg hammer in one direction. After the throw, the hammerss4txg 82euc1 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 gives it kineticpu. rmgk3k i 9q.dtj6. energy. An hour after the fan has been turnem6utkipd. gk3rj. . 9qd 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 mk 42odhrcro1 ye6v c38,o;pg5e0m ldx, a speed of 4.0 m/s, kg;p4dcvx3e5 6yo,r h0dolo1 2er8c mand 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 ok(k-vpr/9y 0kxh d) leor*y3the middle shelf in the bookroom 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 toy rr/kdl90(h) o * 3ypxkv-kehe box. The box has a mass of 10.0 kg.

  02.32: An automobile engine tp r1np. ,)h kk :flut coa9.kk318oeodelivers 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 magnitude to1 k:3f9olpp1 oce t. )h8,ak.ukrnkof the retarding force acting on the car?

  09.13: In the figure to the right, ak21xn-idcoz+ g+ b zw8 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 cx+1zz+b wg-oi n2d k8being 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 th5k x/( lbt5rfqe right, 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 F = 240N. The box, of mass m= 20.0 kg, has a speed of 2.50 m/swhen it reaches the top of the inclrf5 xq(bl/kt5 ine.
How much work is done by the applied force F to the box?

  11.30: Two cars travel to the right. qzbzuo:*c+axv o;0(ee. v lf, each starting from rest, along a straight road. CarA has twice the acceleration .*l+czqob ;v fo. 0:uxv zeae(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 in terms of B?

  12.07: What is the net force acting on the objecthrf36 gn* ;qro during the time interval of the accr* g;h rf6n3oqeleration?

  12.08: Through what distance does the obahhhk6;3gk:ww f+bb+ ject move during the time interval of the ac;h6h f+wk+ wbkha:b3 gceleration

  12.19: The magnitude of the linear momentum of a 4.00 kg point mass is changed fyb.on-+q s vnueo :1l4rom 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 masse l4+.v oqs -:yb1nuon during this time interval?

  14.11: A crate gains 36.0 J of kinetic energy while its speed is increaseg 0 *wfb pte5 9v-e9hktqqch6,d from 2.00m/s to 4.00m/s. Which one of the follo w9qtptc*6h9q0eegh bf5-k,v wing choices best represents the mass of the crate

  94.38: A force F at an angle θ above the horizontal is used to pull a heap/igo jhjen*- b-)u o*vy suitcase of weight mga distance d alooi*g/jjb e-*) u p-onhng 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 powo)3 (6p um4qz9p qyixo*dt5 hler 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 bl *zutdp 643o9 o )ihpqqmyl(5xock?

  12.18: A 1.00 kg object is released from rest near the jtm3v b2sl/o3 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 repres3bjlto2 3 m/vsents 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 motio.o8n iyxr+k 8 lk4ucf2nless 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 relationship between the total energy E of the ball and its height h above the surf.n+4 fk8ocxl2 u8kiyrace?

  07.06: A 500-kg car is mov0 tg qr0bc l70fnx3g5iing 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 minig0lci tg03f7q0 5nbr xmum average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s slows down uniformly untilb ;q8g-edk i, s,m*voup 15vwm:m dji) it stops. If the ball travels 15 meters, what18,*pu5 vm:bdv md)mje;og ,wqkis - i was the average net force applied while it was coming to a stop?

  02.26: Consider two labocu bmc2b +tg54sh7uv7f0kc-sratory carts of different masses but identical kinetic energies and the thr-c0 cmu ss72f u4t7vcb5 g+kbhee 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 the air with an initialy8vslqddf3;z 6 n,s,:t:o eoi speed of 4.60 m/s. Ignoring air resistance, what is the change in its potentiadi,3,8fd;n:sq e ytslo: vzo6l energy when it reaches its highest point?

  06.20: A boy jumps from rest straight upward from a flat, stationargywte3er3. e)v,r gw l6- ojihq313d xy concrete surface. r3e3 e3h .)jog- ,wtevdq l6r1xiyw3 g 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 aheightH above the ground. The objt4jxp o yw .e/0s5k0viect crashes into some soft earth and comes to rest by compressingko0.4/xs5j ypwetv0 i 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-q o l3,p+krxwmo46rw b un+n4 M is dropped from aheight H above the ground. The object bounces off of a horizontal surface in a collision lasting w4ur+4bw+kxnnop3o6lqr -m, 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 9kilx ag 1/*skmass mon a cord length L is pulled sideways until the cord makess9lixa kk1/g* 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. ajbh1 ,bm8ng7 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 when it returns to its original position babjmgn7h,81 at the bottom of the hill?

  06.09: A deliveryman moves 10 cartons from the sidewalk, along -gg)-ufwfx98+g9 ygp x5 gl0tf*nmyy 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 them toyw 5 xmng0ux+ft-g gf8pf9y *l)gy9g- the loading dock?

  12.16: A constant force F=50N (as shown in the figure) iszhqo(24 yh 7rj 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 represents the work done by the force F onther 4(jq 7yzohh2 box for the motion?

  04.48: Two identical bowling /uwfj g)88qfx balls A and B are each dropped from rest from the top of a tall tower. Ball A is dropped one second before ball Bx8 )fu/f8 gwjq. After 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 mm mmww(ly/q( jtn 58f+ass M straight upward with an initial non-zero speed v. The object riwm/(mqm8yfnt+(5 lj wses 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 rise above the launch point? Ignore air resistance.

  96.20: A force of 10 N st5li w0 :j,ej92lbg tagretches a spring that has a spring constant of 20 N/m. The potential enerl0:25aw lg egj b9ti,jgy stored in the spring is:

  97.10: A compressed spovogm - 1d/7z:3hjufs ring has 16 J of potential energy. What is the maximum speed it can impart to a 2.0-kg obg:/fojsvz -ho d3m7u1ject ?

  

  10.31: An object of mass M starts from rest at the bottomlphji *i(t 3d,zo(ex8 ojxo,g92e3iu of a fixed incline of height H. A pdhe ,zu (te 9xxgl2i38oji3,oj*(io 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 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.