07.10: Contact forces are examples of wh ,xj3e +6gj z4kjdofrt0b (5vaich of the fundamental forces?

  99.02: Which of the following terms is NOT related conceptually to the oj -mp:v 5cwd -ksx q/*fso/6kgthers?

  02.20: The graph shows the relationship betxx ol1 b:jm)uz/)o qt*1kc ;lnfwnn,. ween the mass of a number of rubber stoppers and their resulting weight on some far-off planet. The slope of the grakj,lnuq tlc/ n: .o;1xw)x) 1 bmnoz*fph is a representation of the:

  10.15: Three blocks, labeled A,B, and C, remain at rest on a table. The magni2y )3*ytzyw- m xegqe-tude of the gravitational force on each block is indicated on the figure. What is the magnitude of the contact forcezye-*wx t) myy2q -eg3 on block C from block B?

  14.04: Three equal masses are suspendev45q dae4/twyro onkf1 6.l5bi -omd*d from a classroom ceiling by a series of strings as shown in the figuv-6*ryl .eb4n1qoo5tdd4 w/ oiam5 fkre. Which string has the greatest tension?

  16.05: In the figure shown, the mass m = 6.0 k。and the ma)64+wj vu jz eq12ztqwss M = 14.0 k。are stationary. The mass M rests on the floor. Which one of the following c u4jvz2+1q6e)tw q jzwhoices represents the tension in the string connecting the masses?

  14.13: Which one of the following scientists is most associated wiis-jl;a s;xhr :m:v4 qth the following statement: “For small dissxl rvms4 ;q-;ji:a h:placements 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 ;k*jueipm2k1jg o;k3 force F is exerted at an angle of 2 kji;ujo*k ;kgem13 p$\theta$. 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 const -gki4ty 4v3 qlm(nslt5k i)mq05m8rn ant speed by means of a force P as mm iqmyt5gr t5 ()vkl-nk80lq4 ni43sshown to the right. Which of the following must be true?

  99.08: A weight can be hung in any of the following four w( fhv iqx *s(qjq+)c4cays. In which case is the string most likely to fv +iq(c chx4*s()jqq break?

  96.39: Assume the objects in the following diaf knz9* yw(v2ehd5q(x /typs-r 9pe+rgrams have equal mass and the strings holding them in place are identical. In which case would the strinedyn/q9 wf 2kr 5ps(zh* (rvy+pte-x 9g be most likely to break?

  16.10: A person wishes to accelerate an object upwardvtw16 (egh*jq uniformly. Which one of the following choices must be true of the force F, provided by the person onto the object? W represents the magnitude of the gravitational force acting on the objege j (v*qht6w1ct. Ignore any effects of the air or of the Earth’srotation.

  11.12: A 5.0 kg mass moves along cv 2t tspfh43hb 56muxy+10cg the x-axis, at one instant of time, the mass has h b5+xhmut2 sfgctpyv43016c position 2.0 m, velocity 3.0 m/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 on a rough surface by a horip j.fhn( p:kv1zontal force of 15 N as shown, during the push, the object accelerates uniformly topv1pf j .(k:nh 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 in the figure to the right is slidit(ck x)5dnd :kng to the right along the floor. A horizontal force of 10.0 N is being applied to the right. The codxt k)n5: (kcdefficient 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 pl tzv92pedoo)z)h-z9 f44g kktane 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 horizof0)+u+np otx) uml-shntal steel plate as shown in the diagram Ap h))un u++lft- s0mxo.
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 that makes thi4mvb-k;yfg h, 5uz:te angle θ with the horizontal. The block remains at rest as θ is slowly increased. The magnitudem:bgfzi-k4 htv;u y5,s 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 x,)1 rw/yxkzxxn jy+ :an angle 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 on ar2 6k1ueipzbfwuf 1;9 second plane (where friction is significant) in inclined at the same frkub zi29pw6 e 11uf;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 ha( hy9qe 2hcsi +lur0f d tiw:57t1iv(hs a gravitational force of magnitude N 10 acting on it from the Earth. Which of the following gives the correct comphqy ( :v2il0cei75u(ri d+ t19hhtswfonents 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 iv(2ac t 2+w o:vr1jgti 1ajua-nclined plane. The free body diagram of the object is shown with the gravitational forc + gw:aj1tv1c uj(va2ita- or2e 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 between

  08.20: A person pushes a block of mass M=6.0 kg with a constant v51o 0ab(af jzspeed of 5.0 m/s straight up a flat surfa(fja 150 bavozce 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 1z5n6x g d7wd)soh/wd ;2gy rq7 wpbc( w2l*leon an inclined plane of angle θ . When released, the block does 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 frictig5e2nq6z; 7)7w*l w1(srd hcwbwlpg x2 do/dyon 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 massc 6r9+j rn(ojf M is released from rest at the top 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 thesmall object slides. During the slide, what is the magnitude of the normal force from the tableroj6 cj(f n9+r on the incline?