07.10: Contact forces atguy gac)-1kyd *1l:i7gz ; s 1g1dxjore examples of which of the fundamental forces?

  99.02: Which of the following terms is NOT related conceptually to the othersbj5h* a 1r+1nrgmkck:bao 8: d?

  02.20: The graph shows the relationship between the mass of a number of rubbei+: ruoaj(f v9r stoppers and9:or a(fui vj+ their resulting weight on some far-off planet. The slope of the graph is a representation of the:

  10.15: Three blocks, labeled A,B, and C, remaihzquqgm4ab s2l l+ n n 3rq*e)+w6z/a6n at rest on a table. The magnitude of the gravitational f+szb +2 4lzqn ra6ul6)aqgh3/w *meqn orce 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 clam,5srko 62xto)t,4 wv wk +uptssroom ceiling by a series of strings as shown in the figure. Which string has the greatest tension? oukw5ts)4,6t+t, rxvpmk o2w

  16.05: In the figure shown, the mass m =oc:q x c9pqtu;ey;, v7yf6/wn 6.0 k。and the mass M = 14.0 k。are stationary.e;q,/nup 69:o yyxc;w qfvc7t The mass M rests on the floor. Which one of the following choices represents the tension in the string connecting the masses?

  14.13: Which one of the following scientists is 0,9au4kgsc ,knigtlr9u2a . m most associated with the following statement: “For small displacements of an object from equilibi0, .92cka4lgsrtuga k ,mnu 9rium, there is a restoring force that is proportional to the displacement.”?

  94.26: As shown in the accompanying figure, a force F is exerted at an 5sf)5 4-x*c l9k ifldplao/yv angle of x/f*5ylk lap9lcd i s-4 v)f5o$\theta$. 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 rougs1(r eokfml,wk7 z+ 1nh horizontal floor at constant speed by means of a force P as shownmokr17lkns + wf1ez(, to the right. Which of the following must be true?

  99.08: A weight can be hung in any of the following four ways.g:yk:, 2/0ya b, .r c .lhcuxbhehl8bs In which case is the string most likely to l :bguy8b kh0c:h2bah cr. ,sel.yx/ ,break?

  96.39: Assume the objects in+67a s1s*gv34lq cnhqp 6nbc x the following diagrams have equal mass and the strings holding them in place are identical. In which case would the ccxpnl 3ng v4q h*qa61 7s6b+sstring be most likely to break?

  16.10: A person wishes to accelerate an object upward uniforc13)u7 o(lz(zvparmq mly. Which one of the folloczr3uavqol ( )7p1z(mwing 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 air or of the Earth’srotation.

  11.12: A 5.0 kg mass moveso ode +eawi1h5 di9/ +9r3vobb along the x-axis, at one instant of time, the mass has position 2.0 m, velocity 3.0 m/s,++ba13 e o5herii9oodvw/d9b 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 sifj6eg:f-)no;y lm.8*vw b qvurface by a horizontal force 6f)jo8* mvyi.l:b enq vgw- ;fof 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 in the figure to the right is sliding to m8dg 0io 9s8zlv/ usk1the right along the floor. A horizontal force of 10.0 N is being applied to the right. The codom/8i lz109svsug8 kefficient of kinetic friction between the box and the floor is 0.20. The box is moving with:

  00.32: A block rests on sds12psdjzw. jn xc5de0 h/ /.y xhc3,a flat plane 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 horizontal steel plate as showihqe:neyqs b,+ 7.me.p+atm- s vq)f)n in the diagram A. hsaq)+ni yb.: e+ pet)sf7q-.me, vqm
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 with the horz )hfr /4h6d+yo-zn wnizontal. The block remains at rest as θ is slowly increased. The magnitudes of /z)fzy4 h-6oh+ nrd wnthe normal force and the static frictional force of the incline on the block

  01.11: A 5 kg block rests on a flat plane inclindlwyd)warbugo 5 :-q 8ox.5i+ed at 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 a second plane ex a -6en)o5f; yhukk ,cxcd *nkf:u:4(where friction is significant) in inclined at the same angle, it will begin to accelerate at 2.0 m/s. What is the force of friction nx-kk5n *h :,y dek)oc6f:4xefauu; cbetween the block and the second inclined plane?

  08.08: An object on ahgmz lsb6s mgv+(1* .qn inclined plane has a gravitational force of magnitude N 10 acting on it from the Earth. Which of the fbm(lsg6vsh q+gm z1.* ollowing gives the correct 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 plane. The f,y pubc0*zn1,) tu 5ivb5mqjp ree body diagram of the object is shown with the gravitational force repre* 15pp,)j05 qubu yt,bznmvicsented 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 u pnps5)etq*d*ljc7j63 q v 0jvqb; p1speed of 5.0 m/s straight up5 qju6p j7t3v*dns1;qpqepb cl)* vj 0 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 ozm.n/q*5rh lk(dv5ktxd h 18 . 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 friction between the block and inclined plane is 0.92. Which one of the following choices best represents the mass,m,k d5rv h*t5(o lnm18h.xk/ qzd of the block?

  17.40: A small object of mass M is released fr5m5xp ; uhp8pdom 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 table on the incline?h5u p5 pd8pmx;