Suppose you want to push a box that is lying at rest on a rough horizontal surface. The coefficient ofstatic friction between the box and the floor is us, At what instant does the force of static frictionbetween the box and the ground have its maximum.magnitude?a) When the magnitude of the friction force equals the magnitude of the normal force on the boxb) When the box is already sliding on the surface) At all times it maintains an almost constant magnitude, regardless of the magnitude of theapplied forced) When the box is in a state of imminent motion

Answer option (d) when the box is in a state of imminent motion

Answered: Suppose you want to push a box that is…

University Physics Volume 1

18th Edition

ISBN:9781938168277

Author:William Moebs, Samuel J. Ling, Jeff Sanny

Publisher:William Moebs, Samuel J. Ling, Jeff Sanny

Chapter5: Newton's Law Of Motion

Section: Chapter Questions

Problem 42P: Suppose the mass of a fully loaded module in which astronauts take off from the Moon is 1.00104kg ....

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Calculate the maximum acceleration of a car that is heading up a 4.00slope (one that makes an angle of 4.00with the horizontal) under the following road conditions. Assume that only half the weight of the car is supported by the two drive wheels and that the coefficient of static friction is involved—that is, the tires are not allowed to slip during the acceleration. (Ignore rolling.) (a) On wet concrete. (b) On wet concrete. (C) On ice, assuming that s=0.100 , the same as for shoes on ice.
Suppose the mass of a fully loaded module in which astronauts take off from the Moon is 1.00104kg . The thrust of its engines is 3.00104N . (a) Calculate the module’s magnitude of acceleration in a vertical takeoff from the Moon. (b) Could it lift off from Earth? If not, why not? If it could, calculate the magnitude of its acceleration.
In a television commercial, a small, spherical bead of mass 4.00 g is released from rest at t=0in a bottle of liquid shampoo. The terminal speed is observed to be 2.00 cm/s. Find (a) the value of the constant bin the equation v=mgb(1ebt/m), and (b) the value of the resistive force when the bead reaches terminal speed.
A physics major is cooking breakfast en she notices that the frictional force between her steel spatula and Teflon trying pan is only 0.200 N. Knowing the coefficient of kinetic friction between the two materials, she quickly calculates the normal force. What is it?
Calculate the maximum acceleration (in m/s2) of a car that is heading up a 13.5° slope (one that makes an angle of 13.5° with the horizontal) under the following road conditions. Assume that only half the weight of the car is supported by the two drive wheels and that the static coefficient of friction is involved--that is, the tires are not allowed to slip during the acceleration. (a) on dry concrete (b) on wet concrete (c) on ice, assuming that µs = 0.100, the same as for shoes on ice
Suppose you are standing on a train accelerating at 0.30 gg. What minimum coefficient of static friction must exist between your feet and the floor if you are not to slide?
Suppose a block with mass of m=5 kg is on a ramp.if the coefficient of kinetic friction between the block s as me ramp is 0.15,the angle between the ramp and the horizontal axis is 35 degrees. A)find the magnitude of the normal force and magnitude of the friction.
Calculate the maximum deceleration (in m/s2) of a car that is heading down a 7° slope (one that makes an angle of 7° with the horizontal) under the following road conditions. You may assume that the weight of the car is evenly distributed on all four tires and that the static coefficient of friction is involved—that is, the tires are not allowed to slip during the deceleration a) on dry concrete b) on wet concrete c) on ice, assuming that µs = 0.100, the same as for shoes on ice
Suppose you have a 150 kg wooden crate resting on a wood floor, with coefficient of static friction 0.500 between these wood surfaces. (Enter the magnitudes.) If you continue to exert this force once the crate starts to slip, what will its acceleration (in m/s2) then be? The coefficient of sliding friction is known to be 0.300 for this situation.
A 64.3 kg skydiver jumps out of an airplane with a parachute. She decides not to pull the ripcord until she reaches terminal velocity. If the resistive force proportionality constant is 2.35 kg/s, what is themagnitude of the velocity when she decides to pull the cord? (Assume the drag force is proportionalto the speed.)
A block of mass M1 = 3 kg rests on top of another block of mass M2 = 5 kg. As shown in the figure, the top block is connected by a cord to a wall at left. The bottom block rests on a frictionless inclined plane of angle theta = 20o and has a force F applied to it down the plane. If the minimum force for which the bottom block will begin to slide has magnitude F = 2.5 N, what is the coefficient of static friction (us) between the two blocks?
A physics major is cooking breakfast when he notices that the frictional force between the steel spatula and the Oiled Steel frying pan is only 0.450 N. Knowing the coefficient of kinetic friction between the two materials (0.03), he quickly calculates the normal force. What is it?

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