Of the four fundamental forces that act in the universe, which one supports a book that is at rest on a table?
A) the photon force
B) the gravitational force
C) the electromagnetic force
D) the strong nuclear force
E) the perpendicular force
C
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Relative Velocity: An airplane is pointed at 45° north of east and is moving at 71 m/s with respect to the air. The jet stream (moving air) carries the plane at 30 m/s toward the east. What are the magnitude and direction of the velocity of the plane relative to the ground?
What will be an ideal response?
The galactic center lies in the direction of which constellation?
A) Orion B) Leo C) Taurus D) the Big Dipper E) Sagittarius
The force of gravity between two objects
A) increases with the masses of the bodies, but decreases with their separations. B) increases with the masses of the bodies, but decreases with the square of the distances between them. C) increases with the square of their masses, but decreases with the cube of their periods of orbit about the Sun. D) depends on the density, not the mass of the bodies. E) depends on the temperature, density, and size of the bodies.
A piece of wood 350 mm × 350 mm and 15 mm thick conducts heat through its thickness under steady state conditions
The rate of heat flow is measured to be 14.0 watts when the temperature difference is 28 C°. Determine the coefficient of thermal conductivity for this wood A) 9.2×10-4 J/(m?s?C°) B) 270 J/(m?s?C°) C) 16 J/(m?s?C°) D) 0.061 J/(m?s?C°) E) 33 J/(m?s?C°)