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A 60-foot-long, 950-lb gin pole used to raise sections of a communication tower is suspended by a standard steel cable of 0.110-in.2 cross section with an effective modulus of elasticity of 12 * 106 psi. As the gin pole descends at a constant speed of 30 ft/min, an accident causes the top of the cable, 70 ft above the gin pole, to stop suddenly. Estimate the maximum elongation and maximum tensile stress developed in the cable.
Can a non-linear resistance device be made to seem linear by restricting the range of voltages as well as currents used? Think of the light bulb experiment. What might happen to the plot for a linear resistor
the projection lens in a certain slide projector is a single thin lens. a slide 24.5 mm high is to be projected so that
a lost shipping container is found resting on the ocean floor and completely submerged. the container is 5.9 m long 2.9
the ball leaves the students hand with a speed of 12.0 when the hand is 2.20 above the ground. how long is the ball in
If John Glenn weighed 640N on Earth's surface, i) how much would he have weighed if his Mercury spacecraft had (hypothetically) remained at twice distance from the center of the Earth? ii) Why is it said that an astronaut is never truly weightless..
The magnetic flux through one turn of a 52-turn coil of wire is reduced from 28.1 Wb to 4 Wb in 0.10 s. Find the total resistance of the wire
Find how the acceleration of gravity
A billiard ball moving at 6.00 m/s strikes a stationary ball of the same mass. find the struck ball's velocity after the collision
Planets are not uniform inside. Normally, they are densest at the center and have decreasing density outward toward the surface. What is the acceleration due to gravity at the surface of this planet
the first-order line of 571 nm light falling on a diffraction grating is observed at a 17.9 deg angle, at what angle will the third order be observed
Light of wavelength 659.4 nm is emitted by a star. The wavelength of this light as measured on Earth is 661.4 nm. How fast is the star moving with respect to Earth
A ladder of length L = 2.6 m and mass m = 20 kg rests on a floor with coefficient of static friction %u03BCs = 0.54. What is the normal force the floor exerts on the ladder
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