Have astronomers ever seen a gas cloud that looks like it contains planetary systems that are in the process of forming?
A) Yes, there are many such clouds, including the Orion Nebula.
B) Yes, but only the original cloud that formed our own solar system.
C) Yes, but only in distant galaxies, not in our own Milky Way.
D) No, there is no evidence that any interstellar clouds are currently giving birth to stars.
A) Yes, there are many such clouds, including the Orion Nebula.
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Why is Venus so much hotter than the Earth?
A) because it has much more carbon dioxide in its atmosphere B) because it rotates backwards compared to its orbital rotation C) because its clouds have a very high re?ectivity D) because it is closer to the Sun
When Paul compresses air with a tire pump, the temperature of the compressed air
A) drops. B) remains unchanged. C) increases as work is done on it. D) none of the above
The speed of light in a particular transparent medium is 5/8 the speed of light in a vacuum. What is the index of refraction of the material?
At t = 0, a wheel rotating about a fixed axis at a constant angular acceleration of -0.40 rad/s2 has an angular velocity of 1.5 rad/s and an angular position of 2.3 rad. What is the angular position of the wheel at t = 2.0 s?
a. 4.9 rad b. 4.7 rad c. 4.5 rad d. 4.3 rad e. 4.1 rad