The origin of most internal energy in Earth's interior is
A) the Sun.
B) radioactivity.
C) volcanoes.
D) none of the above
Answer: B
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When a freely falling object reaches its terminal speed,
a. it is still accelerating b. its acceleration is zero c. it is decelerating d. its acceleration cannot be determined
Describe the two different kinds of seismic waves. Distinguish between them by describing how they move through Earth's interior
What will be an ideal response?
Equilibrium: A push of magnitude P acts on a box of weight W as shown in the figure. The push is directed at an angle ? below the horizontal, and the box remains a rest. The box rests on a horizontal surface that has some friction with the box. The friction force on the box due to the floor is equal to
A. P sin ?. B. P cos ?. C. 0. D. P cos ? + W. E. P + W.
Why are spectra of stars different?
What will be an ideal response?