07.10: Contact forces are examples of;e i* ygok 1vl6z-cj 6qbt)8ct which of the fundamental forces?

  99.02: Which of the following termdp je*3t vkpbkx1/pu)56 wp) os is NOT related conceptually to the others?

  02.20: The graph shows the relationship between the mass of a numb hp;hhyq5;h; ver of rubber stoppers and ;v;hh;5y q phhtheir resulting weight on some far-off planet. The slope of the graph is a representation of the:

  10.15: Three blocks, labeledvl5y+l(y d* je.era3djtqjc3 022r l*c 3qnnf A,B, and C, remain at rest on a table. The magnitude of the gravitational force on each block is indicated on the figure. What is the magnitude jt3q *j23n.rd5c3(yld*vyalr2c0ej nlf q e+of the contact force on block C from block B?

  14.04: Three equal masses ab dvovpdt9c ah +3c(*1re suspended from a classroom ceiling by a series of th 9v1+3(bd*cco padv strings as shown in the figure. Which string has the greatest tension?

  16.05: In the figure shown, the mass m = 6.0 k。and the mass M = 14.0 k。rasdo4vi(q2 , b,g9yr are stationary. The mass M rests o24,r,vga9( sqi odybrn 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 associa x)ljhef n6 oyd1(n7g2ted with the following statement:7(gjhonl1xnf 26y)d e “For small displacements of an object from equilibrium, there is a restoring force that is proportional to the displacement.”?

  94.26: As shown in the accompanying figure, a force F is exerted *x ))qvfh)y3e4q+a pn 2-raow dqj,toat an angle of )ya d+j4)*t2vofpx3, qhoeqr- )waqn $\theta$. 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 ft5dm6ys;o; vb loor at constant speed by means of a fostobmv5;dy; 6 rce P as shown to the right. Which of the following must be true?

  99.08: A weight can be hung in any of the following four wayspbneh 90va 2(s. In which case is the string mostb2(a n0h9pvse likely to break?

  96.39: Assume the objects in the following diagrams have equ -h4bh0gu xhio9vab4. k,h0xqal mass and the strings holding them in place are identical. In which case would the ob49v4 xh0bh0 x.h,gqahuik-string be most likely to break?

  16.10: A person wishes to accelerate an object upward uniformly. Which one of (2-byegkb/c ethe b/gk beec-(2y 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 on the object. Ignore any effects of the air or of the Earth’srotation.

  11.12: A 5.0 kg mass movez6a+ofy2 w(n kpm; cdb)a6m:3 xlpy0xs along the x-axis, at one instant of time, the mass has position 2.0 mmmawp3cbl)2+ ofy0(zx dn;x:a 6yp k6, 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 objwx2l0b:wcurbhwl)7y k ;jf-8 2 *wgbeect is pushed to the right on a rough surface by a horizontal force of 15 N awb * hflw2w-rybwg 7jx0l)ce b8:2ku;s shown, 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 sliding to the right : 2szl.lz tbam uj2uracp77- ;along the floor. A horizontzucb;a7p- sm .jr7ua2t: llz2 al 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 moving with:

  00.32: A block rests on a flat j b d2/rap pgi18+.tghplane 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 pulwtee4 q.t3.iiled across a horizontal steel plate as shown in the die.t 3qt wiie.4agram 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 z)xei45 g/fvzxk0;we8+ q7wtn1 l xy dθ with the horizontal. The block remains at rest as θ is slowly increased. The mayg t7xxw8f ; /knlize x we)105+v4dzqgnitudes 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 angle ortn2:q)g+o -oo+j gwgf $30^{\circ}$ 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 fricnn; yd9owt;y -tion 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 by9d;nt ;w nyo-lock and the second inclined plane?

  08.08: An object on an inclined plane has a gravitational f,sc1q+s :h m8gf irmv*orce 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 s s*v+g8cr:if1h m ,mqshown 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*-sp ioyg*s x: 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 rexssg *iy o-:p*lationships between

  08.20: A person pushes a block of maq 6w.*hvu ulc3ss M=6.0 kg with a constant speed of 5.0 m/s straight up a flat sw q*vh6.ulu c3urface 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 m37mho7u7t4z3rx *z ek7*jy yd ) ckzipass 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. Whi* z j3h7it7 dy73r)k7uxzyem k* zco4pch 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 agz//uh 14 -qiqs00ilrdjt ; qet 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 o 100r h /;e/zjdi lu4gsqi-qqtf the normal force from the table on the incline?