Which of the following is a difference between low-mass stars and medium-mass stars?
A) Unlike medium-mass stars, low-mass stars can ignite hydrogen and helium.
B) Unlike medium-mass stars, low-mass stars develop an inert helium core surrounded by unprocessed hydrogen.
C) Unlike medium-mass stars, low-mass stars are not completely convective.
D) Unlike medium-mass stars, low-mass stars cannot become giant stars.
D
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A uniform rod (mass m = 1.0 kg and length L = 2.0 m) pivoted at one end oscillates in a vertical plane as shown below. The period of oscillation (in s) is approximately
?
?
A. 4.0. B. 1.6. C. 3.2. D. 2.3. E. 2.0.
Venus is much hotter than the Earth. Which of the following explains most of this temperature difference?
A) Venus has much more carbon dioxide in its atmosphere. B) Venus's clouds have a very high reflectivity. C) Venus rotates backward compared to its orbital rotation. D) The sunlight reaching Venus is more concentrated because of its closer distance to the Sun.
Globular clusters are found in the Milky Way's
Indicate whether the statement is true or false.
When a 24.0-W resistor is connected across a 12.0-V battery, a current of 410 mA flows. What is the resulting terminal voltage of the battery?
a. 11.6 V c. 0.4 V b. 9.8 V d. 12.0 V