The Earth owes its habitability primarily to
A) the chemical composition of its surface
B) a combination of its size and its distance from the Sun
C) its size only
D) its distance from the Sun only
B
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Briefly explain how we can use spectral lines to determine an object's radial motion (toward or away from us). Can we also learn the object's tangential motion (across our line of sight) from its spectral lines?
What will be an ideal response?
Which of the following are in order of decreasing temperature?
A) O9, F2, F7, G2, K0 B) K0, G2, F7, F2, O9 C) F7, F2, O9, K0, G2 D) O9, F7, F2, G2, K0
A radioactive atom has 98 protons and 249 nucleons. If it undergoes alpha decay, what are the number of protons and nucleons, respectively, in the daughter nucleus?
A) 100, 249 B) 100, 245 C) 96, 245 D) 96, 247 E) 94, 247
If more horizontal force is applied to a sliding object than is needed to maintain a constant velocity, the object
A) accelerates in the direction of the applied force. B) accelerates opposite the direction of the applied force. C) experiences greater friction. D) none of the above