Every magnet contains at least
A) one pole.
B) two poles.
C) four poles.
Answer: B
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A 50-kg air conditioner is placed on top of a concrete pad that is 20 cm thick and has a cross-sectional area of 3.0 m2. What is the change in thickness of the pad caused by the air conditioner? Young's modulus for concrete is 2.3 × 1010 N/m2
A) 1.4 × 10-9 m B) 2.8 × 10-9 m C) 1.4 × 10-8 m D) 1.4 × 10-7 m E) 2.8 × 10-8 m
During heating, an amorphous material starts to soften at the ______________transition temperature.
Fill in the blank(s) with the appropriate word(s).
Scattered light in the atmosphere is often partially polarized. The best way to determine whether or not light from a particular direction in the sky shows polarization is to
a. diffract the light through a single slit. b. squint while looking in that direction. c. rotate a piece of polaroid film about an axis parallel to the ray while looking through it in that sky direction. d. rotate a piece of polaroid film about an axis perpendicular to the ray while looking through it in that sky direction. e. reflect the rays from that direction on a shiny metal surface.
Consider a black body emitting 0.2 W/m^2 of thermal radiation between zero and 0.01 ?m wavelengths and 1.2 W/m^2 above 0.01 ?m. What is the total radiation emitted per unit area? What is emitted at exactly 0.01 ?m?
What will be an ideal response?