The 2.0 kg wooden box in the figure slides down a vertical wooden wall while pushing it at an angle of 45. Consider the wood-on-wood friction coefficients us = 0.50 and uk = 0. 20. What magnitude of force must be applied to make the box slide downward with constant speed?
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The 2.0 kg wooden box in the figure slides down a vertical wooden wall while pushing it at an angle of 45. Consider the wood-on-wood friction coefficients us = 0.50 and uk = 0. 20. What magnitude of force must be applied to make the box slide downward with constant speed?
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- A 200 g hockey puck is launched up a metal ramp that is inclined at a 30° angle. The coefficients of static and kinetic friction between the hockey puck and the metal ramp are μs = 0.40 and μk = 0.30, respectively. The puck's initial speed is 4.9 m/s. What speed does it have when it slides back down to its starting point?You are a bully. You pin a 48 kg dweeb to a wall so that his feet aren't touching the ground. Your arm is extended so that it makes an angle 28 degrees with the horizontal. The dweeb's back is so sweaty with fear that there is no friction between his back and the wall. What is the magnitude of the force , in N, you must apply to keep the dweeb in equilibrium? (Use g = 10 m/s2) This scenario is represented schematically below. Unfortunately for you, years later the dweeb is your boss and he makes your life miserable. (Please answer to the fourth decimal place - i.e 12.3445)You are pushing a metal crate against a metal floor. The two surfaces have a static coefficient of friction of 0.62 and a kinetic coefficient of friction of 0.50. The floor is horizontal, and the crate has a mass of 25.0 kg. What is the minimum force you need to apply to get the crate moving from rest? Give your answer in units of N, to three significant figures.
- An object hangs between two walls which are 1.8 m apart. If the rope sags 15° below horizontal and the object’s mass is 1.5 kg, what is the tension in the rope?A 200 g hockey puck is launched up a metal ramp that is inclined at a 30° angle. The coefficients of static and kinetic friction between the hockey puck and the metal ramp are μs = 0.40 and μk = 0.30, respectively. The puck's initial speed is 50 m/s. What vertical height does the puck reach above its starting point?A person wants to move a 10kg box to a different location. He pushes the box at a steady 0.5 m/s across the wooden floor (coefficient of kinetic friction is 0.50). How much force does he apply to the box?