97.01: A force F directed at an angle of θ above the horizontal is used to pe14.qppiukhb+2 ygp/vz 8o fphy2 5z)ullb)h/g yp i. hq+ep 5pf ky12z2pu8zv4o a crate a distance D across a level floor. The work done by the force F is

  97.33: A softball player catches a ball of mass m, which is moving towf-v+u1d2s dn egcu2, eard her with horizontal speed vd seu dnf2ec2+1v ,-gu. While bringing the ball to 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 laborer holds a 20 kilogram sheet of 77tl:ez2xpriqpn s 14pwvx *, wallboard 3 meter above the floor for 4 seconds. During these 4 secondshow much power was expended on the e7xx:*7t 4,wzqpin2lp prsv1 wallboard?

  17.11: A 5.00 kg block slides with uniform acceleration11 r *lgsn0*orj)zbeb on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decrr)eg1sb0 njz1 *b* rloeases 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 acceleration on a horizonta8tk m/mrw 8y3il surface for 5.00 s. The block’s kinetic ener/mtm83wr i ky8gy 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 forf e7kraye9/ijn*gxbc g; 1 q;8ce directed 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 h/ ;nqxc7 e1krjgfig9*y b;e8 aorizontal 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 blov-bw5tx l661 u sn(k:n rg:iqrck for 5.0 s. The block was initially at rest and slides on a horizo1 nk:u-t g6wlr6(xsqrinb5v :ntal 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 throwskph0lxa b 359a )qouxu q;q9mihim492 a 1 kg hammer in one direction. After the throw, x9iq5u2 iq3oh9u;a)0qakhpxmb4 l9m the hammer 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 i :ev 8c3oio8zmt kinetic energy. An hour after the fan has beemc3o8ezo8i v: n turned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a bloc1yw0ffy8x/0 1tyu mx l8ykwm9k of mass 0.50 kg has a position of 3.0 m, a speed of 4.0 m/s, and an t fm 9w881/ 0m1 wyuyyxx0yfklacceleration of $1.0\; m/s^{2}$ . What is the kinetic energy (in Joules) at this instant?

  05.05: A box of old textbooks is o 6bnp(z(yql8ba)m i ;hn the middle shelf in the bookroom 1.3 m from the floo(a 6hym)pb ;(bl8nzqir. 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 24,000 watts (about 32 horsepo;vqo dbbq, d2,tlv0 g6wer) of power to a car's driving wheels. If the car maintains a consttgb d;v0lq,,6d 2obq vant 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 s wdffy5:g v+e.b,r4j(jfk,ebox moves with speed 5.00 m/s at the bottomj5w, e.:(f j+f dfkre gvys,b4 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= 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 speei lz bi35er,er7urz89 d 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 th3ee, brur5 r zliz879ie 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, eac,* -8iyo5v p cwup;iifh starting from rest, along a straight road. CarA has twice the acceleration of Car B. After traveling a distance F, Car A has speed B. When Car -pii*u i8wo 5,c; fpvyB has traveled the same distance F, what is its speed in terms of B?

  12.07: What is the net force acting on the obj+8xsl(of bh+nect during the time interval of the acceleratib8 x lf+hs(no+on?

  12.08: Through what distance does thmzx5*r8 15a isz6vv 8hiqfes2 e object move during the time interval of the acc8isz*zqhv m68a 5ri evfs5 12xeleration

  12.19: The magnitude of the linear momentum of a 4.00 kg(-g4qe u3irrv kq :-ep point mass is changed from 6.00kg.m/s to 14.0kg.m/s in a time intereerqvp qk:g-u4(r 3i-val 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 J of kinetic enl hiari ;ldx7*8yvksq-.o;i1 ergy while its speed is increased from 2.00m/s to 4.00m/s. Which one of the following choices best represents the mass of theqol ;sk*;1i va l7idx.ry 8ih- crate

  94.38: A force F at an angle θ above the horizontal is used to pulbg 9cnhzte+m*1 3*ssgl a heavy suitcase of weight mga distance d along e 3mtcg g+bznh9s* *1sa 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 dzfzp7hj388s (( vyohcelivers a useful power output of 0.10 w to raise a block vertically at a constycfz83hv z8hpj( 7so(ant 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 t4(0 jmb+3dkd bpx)8xql9 iiz 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 gro3ix) ib0 k8z mdjpltq(d+4bx9und, 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 kg object during the fall?

  96.18: A rubber ball is held motionless a height ho above a hard floor axgbd+6a 8 rw1tnd 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 surfa +1xad gtwrb86ce?

  07.06: A 500-kg car is moving at 28 m/s. The driver wk8fnb0 ;4u-znz9lx ksees a barrier ahead. If the car takes 95 meters to come to rest, what is the mag0;u -wbznznf8 kl9 k4xnitude of the minimum average net force necessary to stop?

  00.26: A 500-gram ball moving at 15 m/s9wp3r s.: h)pv .j02xyd hndsu slows down uniformly until it stops. If s2n)9p.j3hhyu dxdvr wp 0 s:.the ball travels 15 meters, what was the average net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of differese+ *1 k.uun6mcimo (vj.5x7np8hktq nt masses but identical kinetic energies and the thuti.6*pvo8n5 m cx(jekk us7nh1+. m qree 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 initik,spr d(,z/s aal speed of 4.60 m/s. Ignoring air resistance, what is the change in its pote/ssd (arpk, z,ntial energy when it reaches its highest point?

  06.20: A boy jumps from rest straight upward froc/z1jpotx+ jz tl 1,3dm a flat, stationary concrete surface. The boy, of mass M, leaves the concrete sujdz1ltc zt,3+x 1op/j rface 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 tp elgb:fe* )q d0 m78aoxx.t:r 0wao3above the ground. The object crashes into some soft earth and comes to rest by compressing thr t e t.q p ld:x:0)*70ooxwma3fgbae8e 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 groundn04 yu)3 b( z8zjs: froag2btf. The object bounces off of a horizontal surface in a collision lasting time T zsgz2yf ut( 08n:j4braf3o)b. 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 pulled si wp;g,cjs5f 4 1xce0bpi6 a0qxdeways until the cord makcpgs1cq0x0,5f4 wbx6ap; i ejes 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 sled, uo - y1zeob1v* which started at the bottom of the incline moving at 10.0 m/s, rises to a height of 3.30 m av -b1ou yeo1*zbove 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 thk4uddy wje .nc vss:yk77z w1h2/q92we sidewalk, along a 10-meter ramp to a loading dock, which is 1.5 meters above the sidewalk. k.4 swycwn /2 1uk79ej:dv7whqsdy2zIf each carton has a 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 force F=50N (as shown in the figurejplx5,;84 jcy*b d(rgxbkfv* ) 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 represents the work done by the force F jvk(rp5 j,*y8;4 cgx*b xblfdonthe box for the motion?

  04.48: Two identical bowling baltr:7 l7t dd4hov8u/my;lgo n .:)m tpow bc-2ols 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 ball B is drod/owb. -rmonm4o:ttyp;:l772o )hd vcu8 tl gpped but before ball A strikes the ground, how are the mechanical energies of the two balls changing?

  11.28: A person thro,.w o37iijf wum r:xn;ws an object of mass 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 obuji fr ww,;7m ixon.:3ject 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 has a spring constant of 20kbfrq dk+bv a/q+2,j* N/m. The potential energy stored in the spring vraf*k, qk b+jd/2q+b is:

  97.10: A compressed spring has 16 J of potential energa93ytiob )4 b6vn ryj,y. What is the maximum speed it can impart to bi)vyrb46o,3ty aj n9 a 2.0-kg object ?

  

  10.31: An object of ma16qh+e:o3vrjd4 osvoss M starts from rest 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 in the v3e:+6dhvoo j1 qs4 ordiagram. 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.