07.10: Contact forces are examples of which og jk *kqne1f49ot9wayf z;6 1vb) we,xf the fundamental forces?

  99.02: Which of the follgf)+ ftd*egrf+x.)ccowing terms is NOT related conceptually to the others?

  02.20: The graph shows the relationship between the mass s3nwx;q 623qjr8osvlb 3 -eg6gza5 e wof a number of rubber stoppers and their resulting weight on some far-off planet.aewng-s v6 s3 3lge6oxw;rj5b8q2z q3 The slope of the graph is a representation of the:

  10.15: Three blocks, labeled A,B, and C, remain bm (-baq7g8qkat rest on a table. The magnitude of the qkabq(b8m - 7ggravitational force on each block is indicated on the figure. What is the magnitude of the contact force on block C from block B?

  14.04: Three equal masses are suspended from a classroom ceiling by a y40a kjwmok58series of strings as shown in the figure. Which jk8y4m k5 o0awstring has the greatest tension?

  16.05: In the figure shown, the mass m = 6.0 k。and the mass M 6 ahbng12/o djzjo6s9 = 14.0 k。are stationary. The mass M rests on the floozjdogha 91/2 s n6jb6or. Which one of the following choices represents the tension in the string connecting the masses?

  14.13: Which one of the following scientists i;gr1(86swa of 7t zkxqs most associated with the following statement: “For small displacements of an kx(s7qt za8;g 1 wo6rfobject 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 e- vv+i;4lhw(mlh,+4*g4xuo eeax r gvxerted at an angle of v g,eve4l*o;u4iwga-4xhl xm+( h rv+$\theta$. 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 floorua 21yt 9met57* br1)z,t rho mtt)mja at constant speed by means of a force P as shown to the right. Which of the following must be truemyor1 97 mzmtb2t)1e)ht, jt*u aat5r ?

  99.08: A weight can be hung in any of the following four ways. In whi bf4sc3n07+wxbghe4ich case is the string most x b0 n73fbehcg4+i4wslikely to break?

  96.39: Assume the objects in the following diagrams 2yjjqre 3q +m5have equal mass and the strings holding them in place are identical. In which case would the string be most lie+q2mj q3jy5 rkely to break?

  16.10: A person wishes to accelerate an object upwa/ ljj,aotn21z 4vb:w wrd 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 object. Ignore any effects of the aijj:1bn,a lz4v2w/ wo tr or of the Earth’srotation.

  11.12: A 5.0 kg mass moves alvvy)o5 e-wfq 5ong the x-axis, at one instant of time, the mass has position 2 f 5e5qov-w)vy.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 horizonta9* 0xabd mge f:t9w2dvl force of 15 N as shown, during theat gw*m2dvf b0x:de9 9 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 in the figure to the rj+4t i0y/cym)gnypu6mb8e k / ight is sliding to the right along the floor. A horizontal force of 10.0 N is being applien+6y /egy0cip/4ymk8b ujm t)d to 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 plane inclined at an angle of( 4k tvhpt9x nmqy9)fgp0/w8v $30^{\circ}$ 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 horizontal steel plate as shdgc; c,:qg;nucd f- u7own in the diagram A.c g;qd-nc uf7 :dc,g;u
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 the angle θ witar1) i zet- 2zyzbaam.d3 e3msvd(. b(h the horizontal. The block remains at rest as θ is slowly increased. The magnitudes of 1 a3v(z3mzbm.btidrs) ye a2 d.(e -zathe 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 anglepih eud + wge4gz7q )8w t5ua:0ekf7k*ib :qn: 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*varfwtpju i .xb 2v 7v)-h4;j a second plane (where friction is significant) in inclined at the2vwav4ri tx fbvjhp7 j. ;u)*- 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 5mj4c h4xi4*qdxf.y a inclined plane has a gravitational force of magnitude N 10 acting on it from the Earth. Which of the following gives the correct components of this gravitational force for the coordinate axes shown in the figure? The y-axis is *cxdxi ha4 m.jqf454yperpendicular to the incline’s surface while the x-axis is parallel to the inclined surface.

  15.13: An object is bep4/jwgf)n+w s*5hv w ting pushed at constant speed on an inclined plane. The free body diagram of the object is shown with the gravitational force represented by W, the friction force hn*w+)f /tvwjp s45wg 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 b g m1qkr05 g+swtifbm /z(:u-z62 zvkslock of mass M=6.0 kg with a constant speed of 5.0 m/s straight up a flat surfmbqsgzfs 2r5:6ki+0vuw 1tmg- zk/(zace 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 incli3qp1u kr,)x. purhb 0tned 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 o 103p b)r uhrt.pu,qxkf 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 top -wf *)rc)0: gcm8xpb m/s swfyof a frictionless incline. The inclinehas a mass M and makesybx f/mfs0 *p8s)c-)rw:cmg w 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 table on the incline?