A ball is thrown straight upward. While it is moving upward, the ball's acceleration is
A) zero, i.e., the ball is not accelerating.
B) in the horizontal direction.
C) in the upward direction.
D) in the downward direction.
E) None of the above.
D
You might also like to view...
What explains the metallicity difference between population I and population II stars?
A. Population I stars formed in regions of the MWG where heavy elements were plentiful. Population II stars formed in regions of the MWG where heavy elements were scarce. As a result of their location of formation, the two populations have differing metallicities. B. Population II stars are older than population II star and have therefore had a much longer time to produced heavy elements. C. Population II stars formed when the abundance of elements heavier than hydrogen and helium was low. Population I stars formed later, after mass lost by dying members of the first generations of stars had enriched the interstellar medium with elements heavier than hydrogen and helium. D. Population I stars are of a spectral type like our Sun or possibly cooler. Population II stars are of a spectral type that is hotter than our Sun. Heavier elements form in the hotter, more massive stars, causing the metallicity difference between the two populations.
At what angle will the highest-order maximum appear for a wavelength of 412 nm using a grating with 435 lines per mm?
a. 46° b. 64° c. 1.1° d. 68° e. 90°
A liquid cannot be heated simultaneously by conduction, convection, and radiation
Indicate whether the statement is true or false
The force of friction on a sliding object is 50 N. The applied force needed to maintain a constant velocity is
A) more than 50 N. B) less than 50 N. C) 50 N.