07.10: Contact forces are examples of which of thld4fo7 ,yu ghnf;sv*dzo** )ee fundamental forces?

  99.02: Which of the following terms jozxr 03f57ynz+upak(j2 l /eis NOT related conceptually to the others?

  02.20: The graph showpuv yw3iqv: 0:s the relationship between the mass of a number of rubber stoppers and their resulting weight on some far-off planet. Thq :vpwu:3 0yive slope of the graph is a representation of the:

  10.15: Three blocks, labeled A,B, and C, remainr: 3yf l1k 8vdr;ruqxx945jzx at rest on a table. The magnitude of the gravitational force on each block is indicx y:9kz;l x1rrdj4v xfr85uq3ated 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 sem haz 4*(ht r)a3z1gn:x1cdmdries of strings as shown in the figa) 4 cmz *r3dh1h(:dm x1ntzagure. Which string has the greatest tension?

  16.05: In the figure shown, the mass m = 6.0 kx5+4 zzgl smy(k(ci26zgp zi7t2w y /k。and the mass M = 14.0 k。are stationary. The mass M rests on ly2zt(gz czyg657/i+ (kw 42ix zspm kthe 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 mostm4+k)s)j qd(icrt9o a ld.*nd jj0 qj3 associated with the following statement: “For small displacements of an object from equili0m34) (*l a c +qrddk9osn j.djjt)iqjbrium, there is a restoring force that is proportional to the displacement.”?

  94.26: As shown in the accompanying fi1(j hip cu4 odq9fx2y;gure, a force F is exerted at an angle of iq ocx9h24pu1fjd (y; $\theta$. 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 fu +.7e pj7tox.hcr(qvhn/ff0loor at constant speed by means of a force unr /0ojv e+p7.(7c hxftfq.hP 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 wap/sv z8rqv1j98 4gkm nys. In which case is the s9s1pkqz8nvmg v8 rj4 /tring most likely to break?

  96.39: Assume the objects in the following diagrams have equal mass and the str ,pwb xr(w4a( 4jy),:etaynugt),urgings r,jur4eun4b)xww,pt(g,t :a y )g a y(holding 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 uniformly. Which,ux5 ec )t2l lhyz1rj- one of the following choices must u y2tzel hlx )jrc-1,5be 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 moves along the x-axis, at one instant ofhr(m(y.p .vcp 1/lqvr time, the mass has hlv /vq.( prcm(1 pry.position 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 gvh +. m0od2 xwig.c24rxxbf(by a horizontal force of 15 N as shown, during the push, the objecbmdofixxg 0.2cw(r+. hgv x42 t 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 o5t7m77rmvsccfuw4u8* en ;zthe 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 movin 7mnus4tfouwcvr57cz7 * me 8;g with:

  00.32: A block rests on a flat planevu v03/3m wffi nbvb+..hgli 6 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 acr-ncu fy t5)n:ross a horizontal steel plate as shown in the diagra:r5tn u)nf-c ym 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 / :b uugu,( yv0s,vgwf5pc )rcthe angle θ with the horizontal. The block remains at rest as θ is slowly increased. The magnitudes of th5vfy(0g :,/ )src,bgpu ucu vwe normal force and the static frictional force of the incline on the block

  01.11: A 5 kg block resy/:oxxmkpz q+-u lqd*w, :i;gts on a flat plane inclined 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 significant) rlw u;hw xcj:ss2botv+u4.z/e)k ;0rin inclined at the same angle, it will begin to accelerate at 2.0 m/s. What is the.erlh)x ;zrso2s u/bjuw 0 v:t4kcw;+ force of friction between the block and the second inclined plane?

  08.08: An object on an inclined plane hazlx i/kar5x )57,o ,u: ejiujrs 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 perp)x/aue5zo,,: uik irljxr 7j5 endicular 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 incline f8 v2dp9:/lpt iee9ywd plane. The free body diagram of the object /w2 d9 e8tpvypeifl9: 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 with a constant speed of 5zez1 sb/s-s(+pc p(s 1qwmt q9.0 m/s straight usqw+(ss9(pb 1tesqz/pz -1cmp 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 misplaju;8e,2qj vkua q(f1 fced on an inclined plane of angle θ . When released, the block does not move. It is determined that the normal forcee;qukuv8 q(j 2a f,1jf 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 the block?

  17.40: A small object of mass M is released from rest at the top of a fridn t: b eto0786o lg hrzr,js;nx;k/7mctionless incline. The inclinehas a mass M and makes an angle θ with the horizontal. The incline remains at reston a table as the;n:6hjxs8tr klm0;ez noob/d r,t77gsmall object slides. During the slide, what is the magnitude of the normal force from the table on the incline?