According to Newton's second law, the force required to accelerate an object is equal to
a. its acceleration divided by its mass.
b. its mass times the acceleration.
c. its mass divided by the velocity.
d. its weight times the velocity.
b
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Suppose that Al the physicist observes a single radioactive nucleus. The length of time until that particular nucleus decays is
A) unpredictable because of the practical difficulties of obtaining all the information needed to make the prediction. B) unpredictable because of fundamental uncertainties arising from quantum physics C) predictable from the known half-life of the nucleus. D) unpredictable because of fundamental uncertainties arising from Newtonian physics. E) predictable, provided Al knows the precise nuclear state of this nucleus.
Explain why it is a common misconception that Galileo faced the Inquisition for his belief in a heliocentric Universe
What will be an ideal response?
When a comet is in the inner solar system, what part of it points most directly away from the Sun?
A) the denser side of its nucleus B) its coma C) jets of gas emerging from its nucleus D) its tail
Electric Field of Point-Charges: Three equal negative point charges -q are placed at three of the corners of a square of side d as shown in the figure. Which one of the arrows shown represents the direction of the net electric field at the center of the square?
A. A B. B C. C D. D