07.10: Contact forces are examples o 79lq5bf-kwsuf which of the fundamental forces?

  99.02: Which of the following terms is NOTbw;2km7 8pqoh*l qbb0 related conceptually to the others?

  02.20: The graph shows the relatio7vaqkjz wqc iw( bw69*fdxwxje ;d)4k4 :00nunship between the mass of a number of rubber stoppers and their4wxw;dujqc z*wa) n je 6kb :v(q49x0w fkd0i7 resulting weight on some far-off planet. The slope of the graph is a representation of the:

  10.15: Three blocks, lqhsci 48wnj1( abeled A,B, and C, remain at rest on a table. The magnitude of the gravitational force on each block is 1nh iqws j8(c4indicated 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 series o:gi x7s;rtq.r/x iz cs: *vr8af strings as shown in the figure. Which string has the 8: i:.gir vx; ss*tq/xcrarz7greatest tension?

  16.05: In the figure 2skk(-4zbd zfshown, the mass m = 6.0 k。and the mass M = 14.0 k。are stati b- 2zzfksdk4(onary. 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 most associated with /:5eb hhbpjguxu5 -s8the following statement: “For small displacements of an object from equilibrium, there is -:5xug 8p/h shb5 jeuba restoring force that is proportional to the displacement.”?

  94.26: As shown in the accompanying figure, a forc*z((s1svud oxxem*. gv9hu7i e F is exerted at an angle of gv(*e7mihsd 9uu 1. xos (x*vz$\theta$. 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 wohq2)h (nz 0,gc;wgoayoden box along a rough horizontal floor at constant speed by mea,zqg h wy0(g)ho2 n;cans of a force P as shown to the right. Which of the following must be true?

  99.08: A weight can be hung in any of theg8/qeu3mshh c7jklp (1zz 5e 9 following four ways. In which case is the string most likely to break? hm1j5 zu3/ g7ehp8sc 9 z(leqk

  96.39: Assume the objects in the following diagrams have equakm*k-o*kygy jbs,3 y2l mass and the strings holding them in place are identical. In which case would thbojy3s-**mk k2 ,kgyye string be most likely to break?

  16.10: A person wishes to accelerate an object upward uniformlyjk37,gecz,a1i al+vs0miq * d. 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 gravitati,dgq li*aes 07vkm+a3c zj1i ,onal 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 of timzcj ygl(.8up 2 4uxw(ve, the mass has positioguw8v(c.( uly 2j zx4pn 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 p4p ;e wuw yqj93,*x5k0uquvolushed to the right on a rough surface by a horizontal force of 15 N as shown, duriq;x3jvo l5wy* ,0q9uw u4ukpe ng 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 the right77lh2fc6 4g1de rkedr along the floor. A horizontal force of 10.0 N is being applied to the right. The coefficient of kinetic friction between the box and the floor is 0.20. The box is mo7k 21e delrghrf7c46d ving with:

  00.32: A block rests on a flat plane inclined atda 9y-z a h:0:7kwhcrq 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 plat zf2n1:nshp( te as shown in n f2(pz:n1t shthe diagram 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 that makes the angle θ with the hqbrd55 p9bd( m :a,wphorizontal. The b: ,(a5b5bdhp qmd w9rplock remains at rest as θ is slowly 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 a 84kgntt6 vi,qgz (x8sq2n;gis ;ks6xt 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 is6;g x:tx vx1* 6intisc 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 b*xix 66n; cgt:st1iv xetween the block and the second inclined plane?

  08.08: An object on an inclined plane has a gravitational force of magnitude )qsihm :(c ,rpfa5y)mN 10 acting on it from the Earth. Which of the following gives the correct components of this gravitational force for the coordinate axes sh r,:fh) pim(s yq5m)acown 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 pushauej*oe0(p vv c w4b2)7w plhm a*u-9oed 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 by f, the applied external push parallel to the incline by F, and the norjmu*ae o0w-l *9owpcu)47va ev( 2 pbhmal force with the surface by n. Which one of the following choices represents correct relationships between

  08.20: A person pushes a bloc*4m0oa kq5v evj;1qyvk of mass M=6.0 kg with a constant speed of 5.0 m/s straight up a flat surface incli4 ev*yq1j ov05;qa vmkned $30^{\circ}$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 incl o(wrcns:w3za2 *k4fe 0wew3eined 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 friction between the block and inclined plane is 0.92. Which one of the c(ewarf 4e3wsk onw02* 3w:ezfollowing choices best represents the mass,m, of the block?

  17.40: A small object of mass M is released from re47 egqer9s h pz7:n3gwst 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 magnitur7h q:ggz937 epswe n4de of the normal force from the table on the incline?