How does the luminosity depend on temperature for stars of the same size?
What will be an ideal response?
The relationship among luminosity, radius, and temperature tells us that luminosity is proportional to the surface area and to temperature to the fourth power. For stars of the same size (same surface area), L is proportional to T2.
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A 12-g bullet moving horizontally strikes and remains in a 3.0-kg block initially at rest on the edge of a table. The block, which is initially 80 cm above the floor, strikes the floor a horizontal distance of 120 cm from its initial position. What was the initial speed of the bullet?
a. 0.68 km/s b. 0.75 km/s c. 0.81 km/s d. 0.87 km/s e. 0.41 km/s
Daytime low temperatures generally occur:
What will be an ideal response?
The force required to maintain an object at a constant velocity in free space is equal to
A) zero. B) the mass of the object. C) the weight of the object. D) the force required to stop it.
A gas can containing a gallon of gasoline is stored in a basement. This gasoline contains
A) both work and energy. B) neither work nor energy. C) work. D) both energy and power. E) energy.