A ball is thrown straight up, reaches a maximum height, then falls to its initial height. As the ball is going up
A. both its velocity and its acceleration point downward.
B. its velocity points downward and its acceleration points upward.
C. its velocity points upward and its acceleration points downward.
D. both its velocity and its acceleration point upward.
C. its velocity points upward and its acceleration points downward.
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A convenient method to write very large numbers is to use scientific notation
a. True b. False Indicate whether the statement is true or false
Spectra from neutral atoms compared with spectra from ionized atoms of the same element
A) are the same. B) are slightly redshifted. C) are slightly blueshifted. D) have different sets of spectral lines. E) have the same sets of spectral lines but different widths for those lines.
The power of American automobiles is usually rated in "horsepower." What other units could be used?
A) watts B) joules C) Calories D) None of the above. E) All of the above.
A long-term exposure to the sound of a riveting machine can cause your threshold of hearing to shift from 0 dB to 30 dB. What is the sound intensity of a 30-dB sound? The normal lowest detectable intensity is 1.0 × 10-12 W/m2
What will be an ideal response?