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Q1. The loaded cab of an elevator has a mass of 3000 kg and moves 181 m up the shaft in 23 s at constant speed. At what average rate does the force from the cable do work on the cab?
Q2. A mass m = 90 kg slides on a frictionless track that has a drop, followed by a loop-the-loop with radius R = 18.8 m and finally the flat straight section at the same height as the center of the loop (18.8 m off the ground). Because the mass would not make it around the loop if released from the height of the top of the loop (do you know why?) it must be released above the top of loop-the-loop height.
find magnitude of the tension in the wire and magnitudes.
Water flows through a horizontal tube of diameter 3.0 m that is joined to a second horizontal tube of diameter 2.2 . The pressure difference between the tubes is 8.0 kpa . Find out the speed of flow in the first tube.
A loop of diameter d = 12 cm, carrying a current I = 0.4 A is placed inside a magnetic field B = (0.2 T) i^+ (0.4 T) j^. What is the potential energy of the loop
A child's toy consists of a piece of plastic attached to a spring, estimate the force constant of the spring
The top and bottom margins of a poster are 4 cm and the side margins are each 5 cm. find the dimensions of the poster with the smallest area
White light containing wavelengths from 405 nm to 760 nm falls on a grating with 8000 lines/cm. How wide is the first-order spectrum on a screen 2.20m away.
Suppose wire A and wire B are made of different metals, and are subjected to the same electric field in two different circuits. How many electrons enter wire B every second
A telescope has an objective with a refractive power of 1.50 diopters and an eyepiece with a refractive power of 270 diopters
The battery of a pocket calculator has a voltage of 4.0 V and devilers a current of 0.17 mA, How much energy does the battery deliver to the calculator circuit
A fireman, 25.6 m away from a burning building, directs a stream of water from a ground level fire hose at an angle of 39.5° above the horizontal
You exert a force of 25 N on the head of a thumbtack. What is the pressure on your thumb
A solid cylinder with a radius of 25 cm and a mass of 4.4 kg is rotating counterclockwise with an angular speed of 0.5 revoultions per second just above a flat surface. What torque due to friction is exerted on the cylinder
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