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A 65.5 kg firefighter slides down a pole while a constant frictional force of 300 N retards her motion. A horizontal 20.0 kg platform is supported by a spring at the bottom of the pole to cushion the fall. The firefighter starts from rest 4.05 m above the platform, and the spring constant is 4000 N/m.
Find the maximum distance the spring is compressed. (Assume the frictional force acts during the entire motion.)
A copper strip (n = 8.47 1022 electrons per cubic centimeter) 2 cm wide and 0.07 cm thick is used to measure the magnitudes of unknown magnetic fields that are perpendicular to the strip. Find out the magnitude of B for the following Hall voltages..
When she tightens the string slightly, she hears 6 beats/s. What is the frequency of string now.
A 0.150kg glider is moving to the right on a frictionless, horizontal air track with a speed of 0.710m/s, Find the magnitude of the final velocity of the 0.150 kg glider
A dockworker applies a constant horizontal force of 79.0N to a block of ice on a smooth horizontal floor. The frictional force is negligible. The block starts from rest and moves a distance 15m in a time 4.50s. What is the mass.
A spaceship is approaching a space station at a speed of 2.55 multiply.gif 105 m/s. What is the frequency of the beacon observed on the spaceship
A 50.0-g object is attached to a horizontal spring, What is the velocity of the object when it is halfway to the equilibrium position if the surface is frictionless
A 528 Hz sound wave travels through a substance. What is the speed of sound in the substance
An asteroid is discovered heading straight toward Earth at 14km/s. An international team manages to attach a giant rocket engine to the asteroid. The rocket fires for 10 {rm min}, after which asteroid is moving at 26^circ to its original path at a..
A standard deck of cards contains 52 different cards. A poker hand consists of five cards, chose randomly. How many different poker hands are there
what is the minimum diameter of the eyepiece required to collect all the light entering the objective from a distant point source located on the telescope axis
A 5 m x 12 m swimming pool slopes linearly from a 1.20 m depth at one end to a 3.40 m depth at the other. What is the mass of water in pool.
A large plastic block has a net charge of -1.0mC. How many more electrons than protons are in the block
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