07.10: Contact forces arhea:( 3kote z2e examples of which of the fundamental forces?

  99.02: Which of the following terms is NOT related conxk.rvmcbx1on 53 jj 8,ceptually to the others?

  02.20: The graph showo xdmh5 -l4o5hs the relationship between the mass of a number of rubber stoppers and their resulting weight on some far-off planet. The slope of the graph is a representation ofodhm5lh 4o5x- the:

  10.15: Three blocks, labeled A,B, and C, remain at rest on a table. The dst /grlrf,m: ,g ,*shmagnitude of thts ,r:gmg /srh*,df l,e gravitational 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 fromz 2aqx*a+w8g q5-z0 mqt jr,im a classroom ceiling by a series of strings as shown in the figure. Which string g0qq5-+8m ti2 mj rx*awazq ,zhas the greatest tension?

  16.05: In the figure shown, the mass m = 6.0 k。and the mass M = 14.0 k。f; erknrz/3t ;are stationary. The mass ;nzt f/3;rrke 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 .9+ ik a fcehotkae32;associated with the following statement: “For small displacements of an object from equilibrium, there is a restoring force tkea+ .kc9toafi 2e3 ;hhat is proportional to the displacement.”?

  94.26: As shown in the accompanying figure, a force F is exerted at an angl71-wlm u9 jx, gocg*ele of 9ljowgu7 1l x g*mc,e-$\theta$. 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 floof5: 3r;do j qlwg/u/ seknjk:gr2 6cm+r at constant speed by mead:ucw25jjkf :6 k +g ; rsmqe3gr/on/lns 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 the followi0.d ru4*fhsi png four ways. In which case is the st 4d*0hsif.p urring most likely to break?

  96.39: Assume the objects in the following diagrams have equal mass m:-ds 3 +m,nnn g( pnibe0k5kfand the strings holding them in place are identical. Inefs, bn(kk-p5m 0g3m d:ninn+ which case would the string be most likely to break?

  16.10: A person wishes to accelerate an object upward;c9pmsi i/z+, e,ffnj 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 gravitats/9f, ejf , mczi+;ipnional 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*og2h.r i hc4k-e)ni1ew 3m3ypb /bhc one instant of time, the mass has position 2.0 m, veloci gpem.3bwoh31* ri4/ h2ne c-ybc )hikty 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 lad-hx2c;(0guo- uwx vt )fn9 the right on a rough surface by a horizontal force of 15 N as shown, durih; xa) -2 d0uxtv lcfnwog9u-(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 figuqnrtf bh79dcf. n 6a,;re to the right is sliding to the right along the floor. A horizontal force of 10.0 N is being applied to the t.dcbna,qr69 7fh n ;fright. 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 flato6e ag 0 8+frf,qzk(lj 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 horiz x i*ba.ed;p q(4b))yroz/mpim)kx -sontal steel plate as shown in the xm(biqpb-i 4 x;d z )*p/)s.e ayrmko)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 m;wg+2xi+uj j8km1 uupw(+ f uan incline that makes the angle θ with the horizontal. The block remains at rest as θ is slowly increaseg +jj+wx;kmu2uiufm8w ( p1+ud. 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 inclined5fxr e;e e6 r6j.j uzuli;:7mn 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 significazlxxc4vl9 wdo 2+cg)+ nt) in inclined at the same angle, it will begin to accelerate at 2.0 m/s. What is the for4dw x9zg+) +cl olv2cxce of friction between the block and the second inclined plane?

  08.08: An object on an inclined plane:s40fpoqk yc)*he,9)b 2r f kpwe5pc i 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 opwpf k 2kfy9,be*ciq) er)c:h s504 pfor 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 kkbydx3t;8;,sw wi)yspeed 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 applk;)8tdk ;3 wb ,wyxsiyied 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 speed of 5.x/3hq-g .u plq0 m/s straigh.q l-uh /3xpgqt 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 mis)xmr.i:9 *bpa8 sfh7xaj8bsm placed on an inclined plane of angle θ . When released, the block does not move. It is determined that the normal force acting from the incline on tsj ia8*)m abb.rphsm x:8 f79xhe 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, of the block?

  17.40: A small object of mass M is releg8owty vj8i /2 dfx6i*ased 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 slide, what is the magnitude of the normal force from thfd tig8j8vwiy2x * /6oe table on the incline?