07.10: Contact forces are examples of which of the f u1s-ab qj;p3 3a (5,xhjb tglwe+*kbvundamental forces?

  99.02: Which of the following terms is NOT relatedjei cwe. ) -rdf7 adiw56 w5dx+j+gj.l conceptually to the others?

  02.20: The graph shows the relationship between the mass of a number of rubber 9i3)d0nkcfc 5x v;nq1bf)hxh stoppers and theirq9kd05n ifxn3b1)hc ) ;vxhfc resulting weight on some far-off planet. The slope of the graph is a representation of the:

  10.15: Three blocks, labeled A,B, ajqv *5oml*s3+rq 7t gle, o(1+duizdfnd C, remain at rest on a table. The magnitude of the gravitational force oni5*,god*7 + zqofjsm1udtr l +vqel3( 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 from a classroom ceiling by a seriesif98(pu-7hiny 5fk ,zetk y6w of strings as shown in the figure. y( i iyk,fkztn857up-hw6 9efWhich string has the greatest tension?

  16.05: In the figure shown, the mass m = 6.0 k。and the mass M = 14.0 k。arer(grf6 7*va yt stationary. The mass M rests on the floor. Which one of the following choices represents the tension in the string connecting ftr6*7arvy( gthe masses?

  14.13: Which one of the following scientists is most assrllkw.e 2 8d-5 b;9vlsh r)dqmociated with the following statement: “For small displacements of an object from equilibrium, there is a restoring force thatmk.8drlrv;dbws2 e l 9h5)q -l is proportional to the displacement.”?

  94.26: As shown in the accompanying figurkj:x;oo)t m- pe, a force F is exerted at an angle of j;otxop:) km-$\theta$. 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 floor at cod*xo 3qsll+w(3 l 0fwpnstant speed by means o l(3ww 03sfxl q*o+dplf 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 following four ways. In whxe vb..)ea1 s vu0o-czich case is the stvb u.vsa- . zxo)ec01ering most likely to break?

  96.39: Assume the objects in the following diagrams have equg5cgh,vjprr :j*k 2q 3 )g07.x irnkayal mass and the strings holding them in place are identical. In which case would the string be *p. k2:c0,r hg kj5)rijy3vg xnaqgr7most likely to break?

  16.10: A person wishes to accelerate an object upwardb a9nhy.*9hccbueb. 2 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 graviba .ycbn *e cu9hb92.htational 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 i1+ nbmhzli3fx i/+u/l 1k ueim) 9l8zinstant of time, the mass has positioni1liihmk+ b+z xu3 f nu/z8/1 m9leil) 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 pushed to the right on a rough surface 5-u- xh mr, qcz+fxel+by a horizontal force of 15 N as shown, during the push, the object acce cq-5eh,ux +xlmz-+rflerates 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 fig dr;11uzypb,2 jgw-ejure to the right is sliding to the right along the flo-j1r;,bp21 yujz gewdor. 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 moving with:

  00.32: A block rests on a flat plane incline ke zw l1pkoc-a:. 99,c01r kchtb zo2mnx)ss/d 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 horizontal steel plate as showgr7 atu3 ns87kn in 7r3nus7t8a kg the 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 a/1ffpt*dubsw .,o)6l +7eg6ti r 5sz, ytsyyfn incline that makes the angle θ with the horizontal. The block remains at rest as θ is slowly increase/+ t,ss,btgz uf .y 7wf5dty1)io*6y spelrf6d. 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 ,.6m umx+ylxnlqzdh.32m 1z tangle 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 sec4 6c; w0nucd( mxi7l80geotex ond 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 betweeu dc74w0 tn 6om(xgie;8 lx0ecn the block and the second inclined plane?

  08.08: An object on an inclined plane has a gravitational force of magnitude N 1rt:g0ygmpezq6l*vg * a)lk*o90 b2 vn0 actgvrb e 02tg*kvqy9m0l * l n*)o:agpz6ing 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 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 speed on an inclined plane. si/k0/c; zz2+*h i z/7b cser+yor dclThe free body diagram of the object is shown with the gravitational force represented by W, the friction forcirzc7d2+ze; lh/sbk *o0cs/riy +z c/e 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 relationships between

  08.20: A person pushes a block of mass M=6.0 kg with a constant sp(- wznvj(3t35o)(d bondkcrjeed of 5.0 m/s straight up a flat surface inclinvjd)o(j(k odctn 3rn3(-5 wz bed $30^{\circ}$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 misplado n lm6ti;.f:ced 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 represents the mass,m, of th;il:n6fmt. do e block?

  17.40: A small object of mass M is released from rest at the top of a frictionle) mm*zyj5 gmw-ss incline. The inclinehas a mass M and makes a-jm5g)zmm wy*n 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?