07.10: Contact forces jxdy 2 em *;,dn dnlhq;y;u:d8are examples of which of the fundamental forces?

  99.02: Which of the following tz-* 14yjjfqcp1if oq6 erms is NOT related conceptually to the others?

  02.20: The graph shows the relationship between th al9 kvh1+-v.fhsw ileh76o+ , ,qfabte mass of a number of rubber stoppers and their resulting weight on some far-off planet. The slope of the graph is , th1 fhf+h bl7aav.l96wive ko+-q s,a representation of the:

  10.15: Three blocks, labeled A,B, and C, remain 8lc;*ufe:vlv uiyl 6q)s/ pp)at rest on a table. The magnitude of the gravitational force on each block is indicated on the figure. What is the magnitude of the contact force on block C frl/; lv*fev i:cly)q6)p8u spuom block B?

  14.04: Three equal masses are suspended from a classroom ceiling byxzt*x 0d ck6iaw 6(jo8 a series of strings as shown in the figuret8j 0 ikxwaoz cd6x*6(. Which string has the greatest tension?

  16.05: In the figure shown, the mass m = 6.mz2)7r5rv du v0 k。and the mass M = 14.0 k。are stationary. The mass M rests on the floor. Which one of the following choices represents the tension in the string connecting the masse uvm2z)5rvd r7s?

  14.13: Which one of the followingbtb:44 ze maq1z(fr8h57 u tiv scientists is most associated with the following statement: “For small displacemea (5i qz7:bzbhtfmr8e41tu4vnts of an object from equilibrium, there is a restoring force that is proportional to the displacement.”?

  94.26: As shown in the accompanying figure, a force F is exe-xwigxh5 ch *0rted at an angle of 5wgx hx0ci-*h $\theta$. The block of weight mg is initially moving the right with speed $v$. The coefficient of friction between the rough floor and the block is $\mu$. The frictional force acting on the block is:

  95.34: A student pulls a wooden box along a rough horizontal floor at constant7sh9 , coy+ixa speed by means of a force P as shown to the right. Which of the following must be trc 7+ s,ai9xhyoue?

  99.08: A weight can be -b v pcw oyo3m*6cd *27bj3rldhung in any of the following four ways. In which case is the strio3p*3 ydbrc6bj2d7w-c volm * ng most likely to break?

  96.39: Assume the objects in the following diagrams have equal (q. iwbpx.zcbvoi1 nv6 j)s4:i -hl4cmass and the strings holding them in place are identical. In which case would th (p j.z- 4qb )lbs:vvh.w4inxico1c 6ie string be most likely to break?

  16.10: A person wishes to accelerate an object upwardkxd9o)j(pakrci /*w7 2: ll tl uniformly. Which one of the following choices must be true of the force F, provided by the person onto the object? W represents the mkkti)cd(7/xlr:pl 9loj * 2a wagnitude of the gravitational force acting on the object. Ignore any effects of the air or of the Earth’srotation.

  11.12: A 5.0 kg mass moves along the x-axis, at one instant oohhy d5 s**:n9agb3el f time, the mass has position 2.0 m, velocity 3.0 m yh9eah3s ln*5d:g* bo/s,and acceleration $4.0\;m/s^{2}$ . What is the net force acting on the mass at this instant of time?

  11.15: A 4.0 kg object is pushed to the right cm s5i,;iqi)lon a rough surface by a horizontal fori sm5c,)lqi;ice of 15 N as shown, during the push, the object accelerates uniformly to the right at 2.5 $m/s^{2}$ . What must be the magnitude of the force of friction also acting on the object during the push?

  96.32: The 10.0 kg box shown inpb898u9js skq the figure to the right is sliding to the right along the floor. A horizontal force of 10.0 N is being applied t s9qp8bu98skjo the right. The coefficient of kinetic friction between the box and the floor is 0.20. The box is moving with:

  00.32: A block rests on a flat plane6a4k-7 bc r01hqfcaf y inclined at an angle of $30^{\circ}$ with respect to the horizontal. What is the minimum coefficient of friction necessary to keep the block from sliding?

  99.32: A wooden box is first pulled across a horizon;w1(nftnleb /.)fsg2ukvy h/ tal steel plate as shown in the diagra2bguw) /hv; /fnnk ly.t(s1efm A.
The box is then pulled across the same steel plate while the plate is inclined as shown in diagram B. How does the force required to overcome friction in the inclined
case (B) compare to the horizontal case (A)?

  07.09: A block rests on an incline thatk3 xw+j(;4w tz1 dcsf c/l7rn t/o5hxq makes the angle θ with the horizontal. The block remains at rest as θ is slo 4w7;(5q/ls htjrfo x3 1+dzwkxnctc /wly increased. The magnitudes of the normal force and the static frictional force of the incline on the block

  01.11: A 5 kg block rests on a flat plane inclined at an angleoh4*0y 3 pn5 ly6fq3tq ytxy)j of $30^{\circ}$ to the horizon as shown in the diagram below.

What would be the acceleration of the block down the plane assuming the force of friction is negligible?

  01.12: If the block is placed omm79gdlf -)pr n a second plane (where friction is significant) in inclined at t9f gmrlpm7-)d he same angle, it will begin to accelerate at 2.0 m/s. What is the force of friction between the block and the second inclined plane?

  08.08: An object on an inclined plane has a gravitational force +)l*vb p zwz z)foei1)of magnitude N 10 acting on it from the Earth. Which of the following gives the corroz* b )))ei1 +zzpfwvlect components of this gravitational force for the coordinate axes shown in the figure? The y-axis is perpendicular to the incline’s surface while the x-axis is parallel to the inclined surface.

  15.13: An object is being pushed at constant speed on an inclined 8/lhs9uy+rco-hw0w b plane. The free body diagram of the object is shown with the gravitational force represented by W, the friction force by f, the applied external push parallel to the incline by F, and the normal force with the surface by n. Which one of the following choices represents correct relationships behwob rh l9wu8c-y/s0+ tween

  08.20: A person pushes a block -2yshw.qmep:7 vy9 n,mse 1mwof mass M=6.0 kg with a constant speed of 5.0 m/s wnmm se1.2q9h:v y-7sp ew my,straight up a flat surface inclined $30^{\circ}$above the horizontal. The coefficient of kinetic friction between the block and the surface is μ = 0.40. What is the net force acting on the block?

  14.20: A uniform block of mass misplaced on an inclined plane of angle θ . Whef3 0dsb fp*xj2 gob5p*n released, the block doefb2fj*3* p5xpbd gs0 os not move. It is determined that the normal force acting from the incline on the block has a magnitude of 62 N while the force of static friction acting on the block has a magnitude of 38 N. The coefficient of static friction between the block and inclined plane is 0.92. Which one of the following choices best represents the mass,m, of the block?

  17.40: A small object of mass M is released from rest at the top6mp9m7ufu ,(wdsh d a4 of a frictionless incline. The inclinehas a mass M and makes an angle θ with the horizontal. The incline remains at reston a table as thesma6hwad ,947ump msdu( fll object slides. During the slide, what is the magnitude of the normal force from the table on the incline?