Posted: November 6th, 2015

PHYSICS

PHYSICS

The fire alarm goes off and a 97kg   fireman slides 3.0 meters down a pole  to the ground floor. Suppose the fireman starts from rest, slides with constant acceleration, and reach the ground floor in 1.2 seconds. What was the upward force F exerted by the pole on the fireman?

A 135 metres long ramp is to be built for a ski jump.   If a skier starting from rest at the top is to have a speed no faster than 24 m/s   at the bottom, what should be the maximum angle of inclination?   Ignore friction

A 35 kg   crate is at rest on a level surface. If the coefficient of static friction between the crate and the surface is 0.47, what horizontal force is required to get the crate moving?

A worker pushes on a crate that experiences a net force of 75 newtons. If the crate also experiences and acceleration of 0.50 m/s^2. what is its weight?

A trained sea lion slides from Rest down a 3.0 meters long ramp into a pool of water. If the ramp is inclined at an angle of 23 degrees above the horizontal and the coefficient of kinetic friction between the sea lion and the ramp is 0.26, how long does it for the sea lion to make a splash in the pool?

A box of mass m1 = 100 kg  rests on a smooth, horizontal floor next to a box of mass m2 5.00 kg.  If you push

on box 1 with a horizontal force of magnitude F = 20.0 N,

(a) what is the   acceleration of the boxes?

b)  what is the force of contract between the boxes?

A 50 kg   steel file cabinet is in the back of a dump truck. The trucks bed, also made of steel, is slowly tilted. What is the size of the static friction force on the cabinet when the bed is tilted  20 degrees? at what angle will the file cabinet begin to slide?

A hockey puck on a frozen pond is given an initial speed of 20.0 m/s.   If the puck always remains on the ice and slides 115 meters before coming to rest, determine the coefficient of kinetic friction between the puck and  ice.

While being unloaded from a truck, a 10 kg   suitcase is place on a flat ramp inclined at 37°. When released from rest, the suitcase accelerates down the ramp at 0.15 m/s^2.   What is the coefficient of kinetic friction between the suitcase and the ramp?

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