97.01: A force F directed at an angle of θ above the horizontal is u5cfhxdk32d:m -czg, nsed to pul d-xn,2g:mkz dfh53ccl 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 toward nk1n* u,h+1jtu . nd -sdwcfl1her with horizontal speed v. While bringing the ball to rest, her hand moves back a distanced. Assuminctu.* snf-l h1+, dk1 nj1nuwdg constant deceleration, the horizontal force exerted on the ball by her hand is

  99.14: A construction laborer holds a 20 kilogram sheet o 408wj wt/it;esyv; czf wallboard 3 meter above the floor for 4 seconds. During these 4 secondshow m8z s/wc;e ;twyjiv04tuch power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform acceleratikc*;x,s0s;uowno :oz on 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 timkw:z ; o,xoc;nso0u *se.
What is the average speed of the block during the motion described?

  17.12: A 5.00 kg block slides with uniform acceleration on b bd6cp0yk3w v0yhi0-a horizontal surwbdcv0p3hi6 y-00y bkface for 5.00 s. The block’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 3.0 kg b by gpxetim3013:15ulabw+ n glock for 5.0 s. The block w1tpyx3b +mib 1 :3na0we5lgugas initially 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 directepjb,xqw 0hytf/f1f:u1a v o) ia6:e f0d to the right is exerted on a 3.0 kg block for 5.0 s. The blj6x1fy001ita :a, bhvfqf /) pw fuoe:ock was initially at rest and slides 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 frict+gx.x 6x syc;oirom we 8;vt+2ionless frozen pond throws a 1 kg hammer in one direction. After the throw, the hammer moves off in one direction while the student moves off in the other direction. Which of the following correctly descrimxw;sxyvtr o;+ec. ox 862+gibes the above situation?

  03.14: A fan blows the air a3p w,isqna 7,and gives it kinetic energy. An hour after the fan has be 3, 7iqaaws,pnen 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 ofelj9z-7xg 6qx 3.0 m, a speed of 4.0 m/s, and an accelerl-x 6zj79qex gation 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 she y8ypvc,7: lnvlf 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 the box. The box has a yl7 ,y:8vp ncvmass of 10.0 kg.

  02.32: An automobile engine delivers 24,000 watts (about 32 mgx fiq:oq;*) horsepower) of power to a car's driving wheels. If the car maintains a constant speed of 30 m)oi:m qxg* ;fq/s (about 65 mph), what is the magnitude of the retarding force acting on the car?

  09.13: In the figure tox4gyd f0dl-3 h the right, a box moves with speed 5.00 m/s at the bottom of a rough, fixed inclined plane. The box slides lg xdfy43 h0-dwith 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 speed 5.00 m/s at thejyae4+2ug ;ny 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 meu2jy ;gan4 +y= 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,gqqlmw,9 s1.d each starting from rest, along a straight road. CarAqm q.s19ldw,g has twice the acceleration 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 n 41 b0b vto0wwt+:.o8mw4c 8vpxptlgfet force acting on the object during the time interval of thevwpmx0 p:bb8f1t+t o wt48v.c0wgl4o acceleration?

  12.08: Through what distbaimn1 d.xrq9u+r -v )ance does the object move during the time interval of the accelerationm .9vxnrqi+1r ubd)a-

  12.19: The magnitude of the linear momentum of a ejy op (wo-)3nv45 pnxs,m-h v4.00 kg point mass is changed from 6.00kg.me nm s- nv po-jwyh4p,v()ox53/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 time interval?

  14.11: A crate gains 36.0 J of kinetic energy while its speed is increased fr9:ba dahkf;*/at bd/bl g.ga 9om 2.00m/s to 4.00m/s. Which one of :akbaah /gd ftgdab9l 9/* .;bthe following choices best represents the mass of the crate

  94.38: A force F at an angle θ above the horizontal is usci+bu /v s94hfed to pull a heavy suitcase of weight mga distance d along a levelchbsu 9/+vf4i 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 ajl9z.+0xob ou kuo.w+nd delivers a useful power output of 0.10 w to raise a ob.j xk+. 09 uuol+wozblock vertically at a 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 surms /actlg9 u --fz4ws4face of the Earth, the gravitational s44szwag-f-/ 9mc tul 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 kg object during the fall?

  96.18: A rubber ball is held motionless a height ho above0:3cnimkfk5kjfw: t ptf i 1), a hard floor and released. Assuming that 5mk i tjktknw3ffc1,:pif0:) 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 surface?

  07.06: A 500-kg car is moving at 28 m/s. The driver sees a barrie)oxwd3j0- wrk /u17dfcr+ze or ahead. If the car takes 95 meters to come to rest, what is the magnitude of the minimum average net fzj)w d +xd/er7f 3ro u0c1kwo-orce necessary to stop?

  00.26: A 500-gram ball sell:tm/a g8qaq)6kjn9u +r ae,ivd t/*i0,cmoving 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 vrq6a el tsgi,da+j0q emt lu*c8a:,/k n i)/9coming to a stop?

  02.26: Consider two laboratt mktpqp0xt9,l1/z 9uxax1qhyq h /jt 57k52yory carts of different masses but identical kinetic ene12ttyqx9q/5,tuh/ 7q0a l y5ppx hkx1 z9jkmtrgies 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 the air with an initial spe9ntvlju j ld,r b7gj*2+ z(u1qed of 4.60 m/s. Ignoring ,t2l+ rz l7*uqbdu( j jj19vngair 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 f ue+fv 5;xl3xz8plr1k/ vu3hsno6 :t ulat, stationary concrete surface. The boy, of mass M, leaves the concrete surface with speed v andv 1pxkhx:;evs3 l53uful6n/to8+r z u 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 hzhcr 9plh*b3nurqq0 p. u0,7object crashes 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 restbruqr*,p3 phh . z0unqc0 l9h7?

  12.48: An object of mass M is dropped from aheight H above the ground. Thqlg5o7k+0zz mr+jvn0;fs 49 i8x a opne object bounces 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 force7fqp+nko s85zazngj0xmv l +4i09or; acting on the mass during the collision with the surface?

  96.38: A pendulum bob mass mon a :;3ekt*0lz qh)u-hfjtcfna , cord length L is pulled sideways until the cord makes an angl-3:hkujcl,t;t*fa e )f zq 0nhe
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, w:uwyic;u/wjz/gea oa.tc2s g+4r,4sl+ 6t yu hich uc/;g4i/6 y rwteo4wa :+t2uc+sgjyul, a z.sstarted 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 at the bottom of the hill?

  06.09: A deliveryman moves 10 cartons from the sidewalk,:vhven 0(jqpi63t s3 r along a 10-meter ramp to a loading dock, which is 1.5 meters above the sidewa6 hr:p (v3e jvisnqt30lk. If 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 Fexew;f-6qk r qn(l 6i5=50N (as shown in the figure) is applied for the 6.0 mete5 ikfrnex( el6-w6q;qr 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 onthe box for the motion?

  04.48: Two identical bowling ball: t58 1w:l0rca *zp 4fjfwmrcos 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 dropped but before ball A 8 occw z pfrjrm4wa51::0tf* lstrikes the ground, how are the mechanical energies of the two balls changing?

  11.28: A person throws an o czr3 s+c9cd9rbject 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 object of mass 0.5M straight upward with initial speed 23+ cdscrz9cr9v. 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 sprij bsh84 8vnl36ev boy+ng constant of 20 N/m. The potential energy stored in tejysb l8hbov6n3 8v +4he spring is:

  97.10: A compressed spring has 16 J of potential energy. What is the maximu7a3ae) x2 dcvdi(ht.w m speed it canta) wi7 va(e ddxc32h. impart to a 2.0-kg object ?

  

  10.31: An object of mass M starts from re3 t)4q+z wxcetst 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 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 samc)q4xtw + zte3e constant non- zero coefficient of kinetic friction between the incline and the object for both trials.