Which of the following is a fossil fuel?
A) petroleum
B) wood
C) hydrogen/fuel cell
D) ethanol
E) nuclear energy
A
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A sound source of high frequency emits a high
A) speed. B) amplitude. C) pitch. D) all of the above E) none of the above
The law of conservation of angular momentum states that:
A) a rotating object must vary its velocity in order to remain at a fixed distance from the axis of rotation. B) if an object is rotating around an object, the product of its velocity and its distance from the axis must remain constant. C) the rotating winds of a hurricane cannot be impacted by friction. D) objects moving around a center of rotation must spin faster if they get further from the center.
The limbs of overturned folds:
a. dip in opposite directions at about the same angle b. dip in opposite directions at different angles c. dip in the same direction d. are horizontal
The Earth is approximately ________ years old.
A. 4,500 to 4,600 B. 4,500,000,000,000 to 4,600,000,000,000 C. 4,500,000,000 to 4,600,000,000 D. 450,000 to 460,000 E. 4,500,000 to 4,600,00