The thermal conductivity of a certain concrete is 0.80 W/m . K and the thermal conductivity of a certain wood is 0.10 W/m ? K
How thick would a solid concrete wall have to be in order to have the same rate of heat flow through it as an 8.0-cm thick wall made of solid wood? Both walls have the same surface area and the same temperature difference across their faces.
A) 53 cm
B) 64 cm
C) 71 cm
D) 85 cm
B
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Acceleration is greater for a satellite when it is at the
A) apogee (farthest point). B) perigee (closest point). C) zenith. D) same acceleration at all of the above places.
Why do astronomers think Miranda has such an unusual surface?
A) It underwent an episode of tidal heating in the past. B) It was squashed by a giant impact. C) It formed from the remains of a giant impact relatively recently. D) Its surface is covered with a powdery dust from micrometeorite impacts. E) Its low temperature affects the colors of its surface ice.
In a large sampling of stars, the largest group represented in the H-R diagram will be the main sequence stars. Why are they so common?
What will be an ideal response?
The force on a charged particle created by its motion in a magnetic field is maximum at what angle between the particle velocity and field?
a. 90° c. zero b. 180° d. 45°