07.10: Contact forces are examples of which of the fundamental forces17r q d.zel)zc?

  99.02: Which of the follow,gbxr9 (ulm-fouooow(.79 wwing terms is NOT related conceptually to the others?

  02.20: The graph shows the relativfz)o; mtlqi+5:r ps(onship between the mass of a number of rubber stoppers and their resulting weight on some far-off planet. The slopespmor vl);f:+5 (izq t of the graph is a representation of the:

  10.15: Three blocks, labeled A,B, and C, remain at rest on a ta:5 mpj, xe1ggoble. The magnitude of the gravitational force on each block is indicated on the figure. What is the magnitude of the co xejm:gg51p,ontact force on block C from block B?

  14.04: Three equal masser18nw3 :ocsd ks are suspended from a classroom ceiling by a series of strings as shown in the figure. Whwnd s c:kr813oich string has the greatest tension?

  16.05: In the figure shown, the mass m = 6.0 k。and the mass M = 14.0 k。are stathx2 m-k8ue*m rb6l:f) ub) w+w+dbc b1zzrzy(ionary. The mass M rests on the floor. Which one of the follow+2+dxcwyu 8bblmf z u:*kh z)be61)mrw(rz-bing choices represents the tension in the string connecting the masses?

  14.13: Which one of thd(d gd.aijc; 9e following scientists is most associated with the following statement: “For small displacements of an object from equilibrium, there is d.adjc;d9g (i a restoring force that is proportional to the displacement.”?

  94.26: As shown in the accompanying figuank8y-;qo0* 3cfchl*i9b ja- s1kpdl re, a force F is exerted at an angle of j n8-y 90s3*; -acc bakiklpfq1dolh* $\theta$. 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 horizont so) l)ux b1l/np7-n.oxzc (k;mxqbr ,al floor at constant speed by means of a force P as shown to the right. W mlpr /1o-7x)csxb ubq)nn x(.;zk,olhich of the following must be true?

  99.08: A weight can be .g:t ox)jla i5hung in any of the following four ways. In which case is the string most likely a5t l.:igo)xj to break?

  96.39: Assume the objects in the following diagrams have equal*hl. gw e2wz.y mass and the strings holding.wzelg.w2 y *h them in place are identical. In which case would the string be most likely to break?

  16.10: A person wishes to accelerate an object upward j)-v11q yncujjwu8b) uniformly. Which one of the following choices must be true of the force F, provided by the perjcwnuy b-v8q1)1 juj)son 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 one instant of time8/b1 *aduabjo, the mass has posi *oa b8a1bjud/tion 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 surfaceo8w9fwt( a +qo by a horizontal force of 15 N as shown, during the push, twoafq+tw 98o(he 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 righ td* 4u-d6 x z.pnpphynipm62-t 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 pnpyi6 t6p u-4-n.d p*zmd2hxbox is moving with:

  00.32: A block rests on a flat plane inclined at an angle of bk e/s0 bi1dwt-0s vl0$30^{\circ}$ 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 shown iu7 ;q6qx1 solxn the diagram A.xs;1 x6lu oq7q
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 t)wqaiy8 p-,p hhe angle θ with the horizontal. The block remains at rest as θ is slowly increased. The magnitudes of the normal force)w, -8pyaq pih 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 at upmct(hrk;c*j * 8)o0)clslngle 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 signimd8qrqk ho3: 0:w2ust ficant) in inclined at the same angle, it will begin to accelerate at 2.0 m/s. What is th:tdmo2qru3kw:h 0 8qs e force of friction between the block and the second inclined plane?

  08.08: An object on an inclined plane has a gravitational fo ul m9,osh za0tcjjv*( d//,jhrce of magnitude N 10 acting on it from the/ tvjsjlhhom c0z/a9j*,,ud ( 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 moz z1hk/byq6j d hn/z- n u3:bskm(:3pushed at constant speed on an inclined plane. The free body diagran /jz6 3b:/(hmmu s-k zhodkqzn3: b1ym 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 relationships between

  08.20: A person pushes a block of mass M=6.0 kg wig 4jw +6e;u5ea: b)b0kjlhchgth a constant speed of 5.0 m/s straight up a 0c u e46kgh:)bjlb;hwgjae+ 5flat 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 misplaced on an inclined plane of angle θ . zv87hh ou6cxvla98 3e4* x.mjto.k4 j cvpj8i When released, the block does not move. It is determined that the normal force acting from the incline on the block has a mj *x8zxjcc4vmvl9k7 ieupjo8 .8a4 6t voh.h3agnitude 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 releab)dtfp)+dt io+j 5.rxsed from rest at the top of a frictionless incline. The inclinehas a mass M and makt j)pox i.drt+f+5)d bes 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?