97.01: A force F directed at an angle of θ above the horizontalr sgmk(r:.2n -l7g beb is used to pull a crate a distance D acroekgs(:- m7l2 rgb. rnbss a level floor. The work done by the force F is

  97.33: A softball player catches a ball ofu1 pp*)mqtsjp30ilr p5p7. ih 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 exerted rsp1hp m3tii p7 qjl)0p5.p*uon the ball by her hand is

  99.14: A construction laborer holds a 20 kilogram sheet of wallboard 3 metwvkn jm -tyo5y.82zgn:oh;, j hu +t.ver abo n.g;t+:o5jt2,hky vz-hmyv8w oj. u nve the floor for 4 seconds. During these 4 secondshow much power was expended on the wallboard?

  17.11: A 5.00 kg block slides with uniform acceleration on asa m xl4:(yyk k z7wwv7ia+;8s horizontal surface for 5.00 ykwla( a8;74vx: s+ksm7wy iz s. The block’s 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 sl2*oaf s0 mysc;ides with uniform acceleration on a horizontal surface for 5.00 s. The block’s kinetic energy strictly decreases from 50.0 J to 20.0 J ifa02 o ;sy*scmn 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 qe. ,fdx zqj 14qr 6r7av/or)s- mjo3iyi/hd:to the right is exerted on a 3.0 kg block for 5.0 s. The block was initiarmqxi- 36qse)a/ z yho 4ifo,r v./jj:q1r d7dlly 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 the right is exerted on a 3.0 kg block fecp 0k h0 ei3rvymg*:2or 5.0 s. The block was inith:3gkc 2pr em*e0vy i0ially 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 frictionless frozen pond throws mg. ) e8xk5w*b+v3hpra: irrea 1 kg hammer in one direction. After the throw, the hammer moves off in one direction while the student moves off in the other directioxmrerabh8e35wp v:g .r i)*k+n. Which of the following correctly describes the above situation?

  03.14: A fan blows the air and gives it kinetic energy. An hour after 2dksa jei-u e1r7k4.othe fan has been tur2j14sriea-7e uokk. d ned off,
what has happened to the kinetic energy of the air?

  09.05: At an instant, a block ow,5j hcuoa .p e 4vx 1z t0c-u7741ab;mfhselaf mass 0.50 kg has a position of 3.0 m, a speed of 4.0 m/s, and an accelerati c41;tacfe , vab -uh70hp5s 7zlwa1.uexj4moon 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 sheqxdp0mh 5 :gb4 .7vgenbsg/q .1ebnk7lf 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 qh ng0m .bbeqs:/75g417ndpbk xgev.work does he do on the box. The box has a mass of 10.0 kg.

  02.32: An automobile engine delivers 24,000 waig r. fbih7rn xv020,rtts (about 32 horsepower) of power to a car's driving wheels. If the car maintains a constanf nr 2xbr0r.viih70g ,t 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 righ 5yea c,fw:, mr6sovi5: cwha-t, 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 ofF = 240N. The box, of mass m= 20.0 kg, has a speed of 2.50 m/swhen it reaches the top of thiwf ro:v5 6:aw 5 cm-h,esayc,e 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 bk twq/a9/3p pgi;u)j m/s at the bottom of a rough, fixed inclined plane. The box slides wit3ptbpqjuk/;g/a 9i )wh 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 incline.
How much work is done by the applied force F to the box?

  11.30: Two cars travel to the right, eac5 2ilxxjo/cu;a or4;cwz7 yb/h 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 B has traveled the same distance F, what is its speed in termsrx 7c2x /ouyo;5ji/cl wbz;a 4 of B?

  12.07: What is the net force acting on the obf8nslk,)7ch kject during the time interval of the 7fh)skk8, lcnacceleration?

  12.08: Through what distance does the object move during the time cr* 8vkztf2 d ig62iq3interval of thqd2v63izt irf*c kg2 8e acceleration

  12.19: The magnitude of the lig b 8o(l1zuf-nnear 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 thisfg bz8 1n(uol- time interval?

  14.11: A crate gains 36.0 J of kinetic energy wutk4j0j 6 xvvw qlr*,q6;pr(qhile its speed is increased from 2.00m/s to 4.00m/s. Which one of l4 v6j0 jqu ; rr*6vqt,kqxw(pthe following 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 heavyl zt3ru8bd2v0j3a gn, suitcase of weight mga distance d along a level floor at constant vvl ,n3a drbgt 2z80ju3elocity. 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 foryf1 6b1zm.sp 4wzry 2bce and delivers a useful power output of 0.10 w to raise a b.w z2s zy1byrp41bf6mlock 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 surface of the Earth, th-bu4yq0 oqp1p e gravitational force acting on the 1.00 kg object by the Earth does 10.0 J of work on the object asy4p 10op-qqub 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 helbx+xp 10s *aw 5ft6dnm5;fuibs4ic 7pd motionless a height ho above a hard floor and released. Assuming that the collision with the floor is elastic, which one of t1 7;i5txb 6xaf+ f4pspnud 5cbmiw*s 0he 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. Ifz0j h16 ox5fydg. y/xvse5njo5; (gr h the car takes 95 meters to come to rest, what is the magnitude of the mini1dn6g sjz5ex y(h gy .5xofoj;0/hv r5mum average net force necessary to stop?

  00.26: A 500-gram ball moving atpifq45c 5u ii9wm)oe z 1s5s3r 15 m/s slows down uniformly until it stops. If the ball travels 15 meters, what ws )i fe1i4 w5cquims59p5 3rzoas the average net force applied while it was coming to a stop?

  02.26: Consider two laboratory carts of different massesgp;k6you o3/vb) ziog9 3ak ,y but identical kinetic energies and the three following statements. bygpz9 ov 3a/k)o, ;g6uoik3y 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 invrtgs3* +yu y0w+rf1 g the air with an initial speed of 4.60 m/s. Ignoring air resistance, what is the change in its potential energy when it reac0s t+1 f3*rygwg+r yvuhes its highest point?

  06.20: A boy jumps from rest straight upward from a flat, 1 rn*edjpobb-9;/iyg 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 mogeib -np9 ; oy/rbd1j*tion. 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 drop:xatlt+cz6g4p y5i j)ped from aheightH above the ground. The object crashes into some soft earth and comes to rest by compressing the earth a distance of H/2. Assuming that air resistancet64l zptij: a+ yg)5xc 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 aheig l:3t qqtrj3r:2u h:r snz-yh k(3d8zkht H above the ground. The object boztu( k3snlrhq hy3k:tqjz:r8 32: -drunces 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 force acting on the mass during the collision with the surface?

  96.38: A pendulum bob mass mon a cord length L iusi7bqkja0gy x:+d( 8 s pulled sideways until the cord s jg7y+ab(d8i kuqx0:makes 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. To3xgib1 qbmmv / ne;+47df.kohe 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 bqbdok+fm 1n.gx/em4 7o;iv 3and 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 sidewal7lm* r fdil:6dk, along a 10-meter ramp to a loading dock, which i ldm6 f*:di7lrs 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 to the loading dock?

  12.16: A constant force F=50N (as shown in the figure) iv,iag t/9b8pi s applied for the 6.0 meter i ,vbta9gi/8pmotion 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 bo47+ fan 3gypigwling balls A and B are each dropped from rest from the top of a tall tower. Ball A is dropped one second before ball B. Afteryafi4p g3g7n+ 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 o:5w iofnxmz*go:i49(s v lo4kf mass M straight upward with an initial non-zero speed v. The o4 (o l5g: 4i:wmoxizfoskn*v 9bject 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 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 nf ce )hxzue5.xszm7,k*mz0/ 20 N/m. The potential energy stored in,mu5) ezms n*zxcz/efk0 h7.x the spring is:

  97.10: A compressed spring hae rhe0:;l(bu7 b/wvnvs 16 J of potential energy. What is the maximum speeeuh eb0v(lnw/ :vr; 7bd it can impart to a 2.0-kg object ?

  

  10.31: An object of mass M sta ye3zr0du.i03ij g ec,rts 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 diagram. In 0, cg.ed3y30r ieuj izeach 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.