07.10: Contact forces are examples of which of thihipqm-vq 4 ,:9j3 qcue fundamental forces?

  99.02: Which of the following terms is NOT related cbnwz j)bf3wb y,k sh ):l.zn.x)cak37onceptually to the others?

  02.20: The graph shows the relationship bet ngfft(z3gx q6acxz00wmmp0,d2+p :q- 1zfkt ween the mass of a number of rubber stoppers and their resulting weight on some far-off planet. The slope of the graph it-f(2pzgm6+f,x kx0zga0p :qfc ntq3z10mw d s a representation of the:

  10.15: Three blocks, labeled A,B, and C, remain at rest on a table. jz/ dq, sqg(0uThe magnitude of the gravitational force on each block is indicated on the figure. What is the magnitude of the contact force on block Cq(,/qz d gsu0j from block B?

  14.04: Three equal masses are suspended from a classroom ceiling by a series o+g)eom t7 g:qksqmz-+;8hpxp ms, 7vsf strings as shown in the figure.;kv sg pxh: qse mot m7q+gm8-zp+7s), Which string has the greatest tension?

  16.05: In the figure shown, the mass m = 6.0 k。and g5/opnzso x(*the mass M = 14.0 k。are stationary. The mass M rests on the floor. Which one of the followi(ozso/*xgn 5p ng choices represents the tension in the string connecting the masses?

  14.13: Which one of the foloeza166x0( 6 ff0s . uxyjv9l2kzlltmlowing scientists is most associated with the following statement: “For small displacements of an object from equilibrium, there is a restoring force that is proportional to the displaceu 6 .9oyev k 10j66xt( 0ms2zllflfzaxment.”?

  94.26: As shown in the accpe0tj9tc mv).n 3 ;nhpompanying figure, a force F is exerted at an angle of mtc n93p)vhn.te;j0 p$\theta$. 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 ho yyq4shj gzh5x:no8gn6.).swrizontal floor at constant speed by means of a force P as shown to the right. Which of the following must nh szngy.x)yq:8o6 h4 g.5swjbe true?

  99.08: A weight can be hung in any of the fo5r4iq g k w6*tw0dg:zallowing four ways. In which case is the string most likely to brea* :4tawr65w gqi0dzgkk?

  96.39: Assume the objects in the foll +hu z,lh z:jubz57*rdowing diagrams have equal mass and the strings holding them in place are identical. In which case 7+dzh r5zl z*u,uhj :bwould the string be most likely to break?

  16.10: A person wishes to accelerate an objecnnv () +0mm w-,xt sgole-xea+t upward uniformly. Which one of the following choices must be true of the force F, provided by the person onto the object? W represents the ma m)-wagnx o-tn+es( +vx,0mlegnitude 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 one instant ofh w/mrn( -q9ur time, the mass has position 2.0 hr- 9qwru/nm( 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 pushed to thbfhx edfe269)lu /h ;e;t rd4oe right on a rough surface by a horizontal force of 15 N as shown, during the push,;u9h/26xf4lof d e t ee)h;dbr 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 slpgf* z,287f cbl bpwf6iding 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 is 0.20. The box is movin7w8c pbl f6, fpz2gfb*g with:

  00.32: A block rests on a flat plane inclined at an angbgg80a24j n aem hzj/i1)bm 9qle 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 shownxxk d5:d )rvc e.rg:b+ in the diagramx.erbdx dvrc :g):k5+ 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 ak-(sj;1gs5 hrc xn+arngle θ with the horizontal. The block remains at rest as θ is slowly increase1(k cg+5sna -rrsxhj ;d. 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 at an y5ga/9yszxbg(+gs. m pjt5w8 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 (wher/xy so9 9q sqd1s8lz -sii7hy6e 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 block and the second inc71 /s9i6y89lz s-x ssyq qdoihlined plane?

  08.08: An object on an inclined plid f;9v0pk8i3 .ps :f/z68 ui pn*t)gktjzsc wane 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 for the coordinate axes shown in the figure? The y-axis is perpe3:);0f fpkiks8.8tit p j c nsuvi6 w*z9pzgd/ndicular to the incline’s surface while the x-axis is parallel to the inclined surface.

  15.13: An object is being pushed at constant sv -c9 26wi7l fnspi63l.iyds opeed 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 9c-yp7snii 2wv36lfos.6 d ilnormal 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 w:zcb f04u u9xaith a constant speed of 5.0 m/s straig4fu c9buax:0zht 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 mas nxhs h-s:jb8j0i, x.ws misplaced 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 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 repre, 8.h0jxnj: hi-swsx bsents the mass,m, of the block?

  17.40: A small object of mass M is released from rest at thegi9,w. y 25qhxrw5 xbvg q04hw top of a frictionless incline. The inclinehas a mass M and makes an angle θ with the horizontal. The incline remains at r.g05higr ,9b 2w 5x4wqywvqxheston a table as thesmall object slides. During the slide, what is the magnitude of the normal force from the table on the incline?