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The cable on an elevator of mass m snaps, and two safety mechanisms come into play. Emergency brakes apply a constant friction force ƒ for the entire drop. Also, at the bottom of the elevator shaft is a vertical cushioning spring (initially uncompressed) having spring constant k. The elevator drops from a distance h above the spring. At the point where the spring is compressed a distance d (before the maximum compression, as the elevator is still dropping), find an expression for the speed.
A person with perfect pitch sits on a bus bench listening to the 445 Hz horn of an approaching car. If the person detects the frequency of 488 Hz, how fast is the car moving.
The moment of inertia about the axis of rotation of the remainder of his body is constant and equal to 0.450kg?m2. If the skater's original angular speed is 0.450rev/s, What is his final angular speed
A roller-coaster car moves 198 ft horizontally and then rises 143 ft at an angle of 30° above the horizontal. It then travels 143 ft at an angle of 40° downward
You are jumping down from a small ledge 0.7 m high onto a concrete floor. what is the force exerted onto your feet during the landing
A point charge with charge q1 = 2.00?C is held stationary at the origin, How much work W is done by the electric force on the moving point charge
find What is the impulse delivered by the bat.
Your expression should give 3.0 m/s for and your answer to part A for theta. Express your answer in terms of theta. Sketch a graph of v versus theta for one complete revolution.
A horizontal circular platform rotates counterclockwise about its axis at the rate of 0.877 rad/s. You, with a mass of 70.5 kg, compute the total angular momentum of the system
During this process the arrow's deceleration has a magnitude of 1800 m/s2 and the block's acceleration has a magnitude of 450 m/s2
A container of volume 23 cm3 is initially filled with air. The container is after that evacuated at 0oC to a pressure of 30 mPa. How many molecules are in the container after evacuation if we suppose that air is an ideal gas.
You drive on Interstate 10 from San Antonio to Houston, half the time at 60 km/h and the other half at 105 km/h. On the way back you travel half the distance at 60 km/h and the other half at 105 km/h.
A 4.79 crate is suspended from the end of a short vertical rope of negligible mass. An upward force is applied to the end of rope, and the height of the crate above its initial position is given by + (0.61) what is the magnitude of the force when ..
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