07.10: Contact forces are examz i+y7oa pow0-km; p.mples of which of the fundamental forces?

  99.02: Which of the following terms .d0pq)qap.u ois NOT related conceptually to the others?

  02.20: The graph shows the relationship between the mass of a n*-r4nq 3pvqc tumber of rubber sto v ncqq-4r3*ptppers and 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, remain at rest ony ah4dh k y4e7j,0ntk;bou9o- 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 fro-o0o hn4bd u,ajke7t;9ykyh 4 m block B?

  14.04: Three equal masses are suspended from a classroo )pz*x f-fnna(m ceiling by a series of nfz*)(-p nfaxstrings as shown in the figure. Which string has the greatest tension?

  16.05: In the figure shown, the mass m meo hhuxb0v- 7w9-* bd= 6.0 k。and the mass M = 14.0 k。are stationary. The ubw0 -h-7*xm9ev dbhomass 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 mo/(ze,a fci .p7 yc fg(knt( fxc(x*mg7x3-eyyst associated with the following statement: “For small displacements of an object from equilibrium, there is a restoring force that is proportional to the dik,7(ec-(7 fnigea/c(g .*fy mz cyy 3fxxtxp(splacement.”?

  94.26: As shown in the accompanying figure, a force F is exer cmjv ;*j(-istted at an angle of *tscmv j;-j (i$\theta$. 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 constant ey(up k*+blujs9eb0t3f sxh2 hph, (40(hgsdspeed by means of a force P as shown to the right. Which o( ep,td(yxs4slbh *2 kbuhfe sg0huh+9p3j0( f the following must be true?

  99.08: A weight can be byv,qwnxw: ;b)*w 2rphung in any of the following four ways. In which case is the string most likpwrb;bwq* w,n)yx: v 2ely to break?

  96.39: Assume the objects in the followingfytu* :/ crbk0 diagrams have equal mass and the strings holding t*yuf0:kc/b rt hem in place are identical. In which case would the string be most likely to break?

  16.10: A person wishes to accelerate an object upward uniformly. Which one o +dya4,uv97wcpfe9; zuwqn(ne9 3ziof 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 onunw9cp o79fay(,+v9n ez dwu34;qez i the object. Ignore any effects of the air or of the Earth’srotation.

  11.12: A 5.0 kg mass movml64inf p3zr(9vs,r p es along the x-axis, at one instant of time, the mass has position 2.0 m, vellr3f49pv(i rsnm z p,6ocity 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 suing+v 88 x qh l uy6,wf9rv4xt1t4q1kkrface by a horizontal force of 15 N as shown, during the push, the f x86k+1 htwl8 quqivkrv94xg1,4t ny 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 gj,uth7( n yd0 vlpj tuxn+*84to the right is sliding to the right along the floor. A horizontal force of 10.0 N is being applied to the right. The coefficient of kinetic frictiot(ndux j8jl,40nut yph + 7*vgn between the box and the floor is 0.20. The box is moving with:

  00.32: A block rests one)rsafk3w+* i b:.ho4eq qw.b 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 show07pb2.skh om(xnr. kq q j55gun in the diagram Askk2rm 0jnpgo .5hq5 7q(.uxb.
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 angl(4pi8 g ejbslt435pw 9iftx bpm(xy8 (e θ with the horizontal. The block remains at rest as θ is slowly increased. The magnitudes of the normal force and the static frictional force of the inclineb8b9spliyp3xm t we(5(4tgjp4( 8 ifx on the block

  01.11: A 5 kg block rests on a flat plane inclinvrf) 4.a7 tzmes jil -+o(9;kxpda0w bed 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 ixlg-+j6 aq:sns placed on a second plane (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 between the +n jx:-6lqsgablock and the second inclined plane?

  08.08: An object on an inclined plane has a gravitational forcec+hb0 lw8ao hz wwc5;4*6ztm z 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 perpenh0w t5*+o8;czmw6 zzl b c4hwadicular to the incline’s surface while the x-axis is parallel to the inclined surface.

  15.13: An object is being pushed atrdgs/:b g o( n:m77 ljob;qcr0 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 by f, the applied exte7 bgd:(7 mrj s/oo0;gb qncrl:rnal 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 maa5dh sq878 bpgss M=6.0 kg with a constant speed of 5.0 m/s588d shbpa 7qg 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 a,(yh z elv fd+u63vc tbpj9:9nngle 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. vfp96:vbyu(, znjt3e+hdlc 9 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 ou+en 5 + aenzkpx2k jj6iqm39/f mass 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 spiz+eqe knj5 au+j/x9 6m32nklide, what is the magnitude of the normal force from the table on the incline?