96.30: An 800-kg elevator acceleratee*wd6(81gfj k by(:hpcjmp *os downward at$ 2.0\;m/s^{2}$ . The force exerted by the cable on the elevator is:

  98.29: A 50-kg studer( y)p4ndb 8qint stands on a scale in an elevator. At the instant the elevator has a downward acceleration i (yq)4nd8rbpof $1.0\; m/s^{2}$ and an upward velocity of 3.0 m/s, the scale reads approximately

  07.13: Astudent weighing 50myl1j .rum0 u+0 N stands on a bathroom scale in the school’s elevator. When the scale reads 520 N, the elevator l0mm+yj uru1. must be

  00.12: Astronauts in an orbiting space shuttle 3s c2h )ei4 vjcltj+(c(p1wtxare “weightless” because

  06.16: A scientist in the International Space Station experiences "weightleskum1e 7vi qa7me+xo-n13d fm:sness+q m7mn1ovudm -xfike 1:ae73" because

  11.10: A string of negligible mass connects lpbd3x hh1/c(x,u + pqur-ug9an object of mass M=10 kg to the ceiling of an elevator. The elevator experiences a constant downward speed of 3.0 m/s. Let Trepresent the magnitude of the force on the l ,gq hhx/9 ud-ub(3r+u1px cpmass M by the string (tension), G represent the magnitude of the gravitational force by the Earth acting on the mass M hanging in the elevator, and F represent the magnitude of the net force acting on the mass M. Which one of the following choices describes the relationships between these forces?

  12.10: A string of negligible mass connects an obt t is 7ko9:q5gb4d2o1 ey upb)l+f)diject of mass M=10 kg to the ceiling of an elevator. The elevator eoidi)k1 ut4b 9fgs7b5ql2yo :)ptd +experiences a constant downward acceleration of magnitude $6.0\; m/s^{2}$ . Let Trepresent the magnitude of the force by the string (tension) acting on the mass M, let G represent the magnitude of the gravitational force by the Earth acting on the mass M, and let F represent the magnitude of the net force acting on the mass M. Which one of the following choices describes the relationships between these forces?

  03.06: A 2 kg mass and a 4 kg mass on a horizontal frictionless surface are co0* c/ uut osnxd4wtix5++ a2lfpq50ze nr .zd9nnected by a massless string A. They are pulled horizontally across the surface by a second xoc rs 0+z0ef4q52a /*nuu dtid+5 z.wpn l9txstring B with a constant acceleration of $12\; m/s^{2}$ .
What is the magnitude of the force of string B on the 2 kg mass?

  03.07: A 2 kg mass and a 4 kg mass on a horizontal frictionless surface are ku((7po: nyj nnb5 n7lx*p p1yp9lj5m connected by a massless string A. They are pulled horizontally across then7:pnjmnpbyxpl*ku lj( 51(n p 79o5y surface by a second string B with a constant acceleration of $12\; m/s^{2}$ .
What is the magnitude of the force of string A on the 4 kg mass?

  03.08: A 2 kg mass and a 4 kg mass on a horizo tm ii1,oqnijt8n3ltn-/ 9t z6ntal frictionless surface are connected by a massless string A. They are pulled horizontally across the sutn-6no9q1t 83miit / zj nit,lrface by a second string B with a constant acceleration of $12\; m/s^{2}$ .
What is the magnitude of the net force on the 2 kg mass?

  96.33 : Two blocks X andY are in contact on a horizontal fric 3ffl6s*r,pyn 18ro k.4 lfctptionless surface. A 36 N constant force is applied to X as s t,p.1 lpf8r3yofk lfn4*cr6s hown to the right. The force exerted by X onY is:

  97.31: Two blocks of mass 1.0 kg and 3.0 kg are connected by a s).qwv+ f. gzk.6vt3sky2t qcstring which has a tension of 2.0 N. A force F acts in the direction6fk. +vzytg wkvq)2qt .c3s .s shown to the right. Assuming friction is negligible, what is the value
ofF?

  99.12: Two boxes are accw 47,leqbsyp5 elerated to the right on a frictionless horizontal surface as shown. The larger box has a mass of 9 kilograms an5qy pl,7ewb 4sd the smaller box has a mass of 3 kilograms. If a 24 newton horizontal force pulls on the larger box, with what force does the larger box pull on the smaller box?

  17.15 : Two blocks X andY are in contact on a frictionless 0nrvr3tsku r w92hds31f5z3q horizontal surface. A constant 35 N force is applied to the right onto block Y. What is the magnitude of the force that block X exerts onto blo 3 ktw13hr2rurf 93nq5vd0szsckY?

  94.25: One end of a massless rope is attached to a mass-rd bwahztif p35/5k m9l h;0t m; the other end is attached to a mass of 1.00 kg. The rope is hungtd-pw r;5 a0h3kl m fbh5zt9i/ over a massless frictionless pulley as shown in the accompanying figure. Mass m accelerates downward at $5.0\;m/s^{2}$. What is m?

  97.30 : A string with masses of 1.5 g3oj*x ldb 6x mdo0l241z4aylj 5zf6skg and 3.0 kg on its ends is hung over a frictionless, massless pulley as shown to the right. What is the approximate magnitude of the acceleration of the masdazx 1y5 4j6 2s gx 3djol40mz*f6blloses?

  02.36: Two masses, m1 and m2, are connected by a cord and arrak4/ah2e/ nlji nged as shown in the diagram with m1 sliding alo k h/2e/nial4jng on a frictionless surface and m2 hanging from a light frictionless pulley. What would be the mass of the falling mass, m2, if both the sliding mass, m1, and the tension, T, in the cord were known?

  02.42: A small box of mass m isplaced o.b.rz6j bbqxbf23pba v)7dv -n top of a larger box of mass 2m as shown in the diagram at right. When a force F is applied to the large box, both boxes accelerate to the right with the same acceleration. The coefficient of friction between all surfaces is μ , what would be the force accelerating the smaller rzjvb .bfb6d .pqb-)2 v7x3bamass?

  17.25: A box slides w1 3qas3kphnqby zqzq /3 u4.v3ith uniform acceleration up an incline. The box has an initial speed of 9.0 m/s and rises vertically 2.60 before compq. qu3vnha3k/3 y34 bqszz1q ing to rest. If the angle of the incline is$30^{\circ}$, what is the coefficient of kinetic friction between the box and the incline?

  05.44: A box of mass mis initi0q::q a,nd)k f+ pjriqally at rest on a horizontal surface. A constant horizontal force of mg/2 is applied to the :drq+k n: ipjaf,0q)qbox, directed to the right. The coefficient of friction of the surface changes with the distance pushed as $μ = μ_0x$ where x is the distance from the initial location. For what distance is the box pushed until it returns to rest?

  15.24: A mass on a frictionless incline has a gravitaty60 l kxffsn:;ional force,a normal force from the incline, and a force applied by a person that all :fl 0 ;sknyxf6are equal in magnitude. The mass remains at rest and the incline makes an angle θ counterclockwise from the horizontal. Which one of the following choices best describes the orientation of the applied force by the person? The +x-axis is directed upward, parallel to the incline’s surface as shown in the figure.