07.10: Contact forces are example(jw5+rk2(t )b cjv8enj;mpdc s of which of the fundamental forces?

  99.02: Which of the following terms is NOT relat6j f9 buco*m8tsf ,mv-ed conceptually to the others?

  02.20: The graph shows the relationship between the mass of a number of rubber ift6mzw xycg,zq c4y: 1./k(ustoppers and their resulting weight on some far-off planet. The slx4.yw1 :kq mycct ,fzg6u(i/zope of the graph is a representation of the:

  10.15: Three blocks, labeled A,B, and C, remar zjb8i6 r6u)hin at rest on a table. The magnitude of the gravitational force on each block is indicated on the figure. Wharz8ir6)uh j6b t is the magnitude of the contact force on block C from block B?

  14.04: Three equal masses are sfpd-i9yoi ;tjnb,f8jual * p/n 15 lv.uspended from a classroom ceiling by a series of fvifa .d -llyop5j, ; n18pjuinbt */9strings as shown in the figure. Which string has the greatest tension?

  16.05: In the figure shown, the mass m = 6.0 k。an pcb3 t(c rnp; +3 :of336l6hdje3( hhrkgrefad the mass M = 14.0 k。are stationary. The mass M rests on the floor. Which one of the following choi:p h;63elc rrne r(33 hjk63og (ftcdfahp+3bces represents the tension in the string connecting the masses?

  14.13: Which one of the following scientists isnq9a 2pz4e*oihstn2)+, yyxr most associated with the following statement: “For small displacements of an object from equilibrium, there is a restoring force that is proportiozeqn2nahi yyx str9 4p2o+ )*,nal to the displacement.”?

  94.26: As shown in the accompanying figure, a force,tbbl a cax3u4iui-t/3ql2 z, F is exerted at an angle of i4cxq2zl i a /bbtu3t-u,3 al,$\theta$. 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 roa * 9s06a,hpavaa od2wugh horizontal floor at constant speed by means of a force P as shown to the right. Which o 9vapa0 w, 6sha2da*aof the following must be true?

  99.08: A weight can be hung in any of the followienz)x jnm0w 93.l+kwgng four ways. In which case is the string mose 3)k xn.9m0wl+jngz wt likely to break?

  96.39: Assume the objects in the following diagrame-ju veqj l76l/dt.o 9qs4:fjs have equal mass and the strings holding them in place are identical. In whf l/49d jes-qulj.ot7je6vq:ich case would the string be most likely to break?

  16.10: A person wishes to accelerate an object upward uniformly. Whia ; jpdy-dlcqa.;+k)t ch one of the f.k ;ta+djqpy l)-cad;ollowing 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 moves along the x-axis, at o se,, t.m*4)*w3 q1ps jomp:r1yxinq rfsyrd( ne instant of time, the mass has position 2.0 m, velocim1)op,p4s (3q*:ijqy t*f rr1mr .ws,dxnes y ty 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 pushedeb8r vjo 4- f 5l4t0tmgc.p;so to the right on a rough surface by a horizontal force of 15 N as shown, g5o;4cmoer8bt04stj.pfl -v 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 slidi:;lj+2 o uupit .pkei*ng to the right 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 it.i ;lu p+ke:oiu*j2ps 0.20. The box is moving with:

  00.32: A block rests v4i-979bli l)lupnio on 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 horizontane*h)wj;v t)3 hy ij1xm3xnv)l steel plate as shown in the die*t3vj))m1)yivxhj 3 xw n;nhagram 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 hkg (-;ocog+p8; lzomd0n ul+z z.l(rsorizontal. The block remains at rest as θ is slowly increased. The magnitudes of the nor0l(g;+poz ;ug +loc .z -sozmlrd8k(nmal force and the static frictional force of the incline on the block

  01.11: A 5 kg block rests ou6m:rnu.x 2( get9p kmn a flat plane inclined 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 (where friction is significan:wlh b )274yuxx-dgr it) in inclined at the same angle, it d gxx4 )u hlwb2iry:-7will 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 has a gravitational force of magnitude N h+dpuc: p h-t010 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 fi:0h- tdc+p hpugure? 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 -2*wj7 clqa nzeet8f 4at 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 normal force with the surface by n. Which one of the following choices represents correct relationship 2zafjw8e tl ncq*4e7-s between

  08.20: A person pushes a block of mass M=6.0 kg with a constant speed o cywoy1)rumg7ojmjicg:/mw x-.b ,1*f 5.0 m/s straight up a flat surmx1u*rmg j.)cmg1 bcj y7ywo :oi, -/wface 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 . nkfsh sx n0q)6hr-5g- 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 betweens-q0r)n-nhx5fk6 gs h 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 of a fri23rx1 lqzmp(afk9)ut ctionless incline. xk fu1mlz3)(r29 qtapThe 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?