Determine the change in length of a 20-m railroad track made of steel if the temperature is changed from -15°C to +35°C. (aSTEEL = 1.1 × 10^-5/°C)
1.1 cm
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What statement below best describes the refraction of light?
a. The absorption of light as it travels through a dense, transparent material. b. The spreading out of white light according to wavelength. c. The change in direction of a light ray as it passes to a medium of different optical density. d. The change in direction of a ray of light as it reflects off a surface.
Near the surface of the planet, the Earth's magnetic field is about 0.50 × 10^?4 T. How much energy is stored in 1.0 m3 of the atmosphere because of this field?
State the law of conservation of angular momentum for a rotating object
What will be an ideal response?
You push very hard on a heavy desk, trying to move it. You do work on the desk:
(a) whether or not it moves, as long as you are exerting a force. (b) only if it starts moving. (c) only if it doesn't move. (d) never—it does work on you. (e) None of the above.