Which of the following are most massive and luminous?
A) RR Lyrae variables
B) brown dwarfs
C) Cepheid variables
D) T-Tauri variables
E) white dwarfs
C
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We now know that photosynthesis is not the only energy mechanism that life can use to supply it with energy
Indicate whether the statement is true or false
When Jim and Rob ride bicycles, Jim can only accelerate at three quarters the acceleration of Rob. Both start from rest at the bottom of a long straight road with constant upward slope. If Rob takes 5.0 minutes to reach the top, how much earlier should Jim start to reach the top at the same time as Rob?
a. 25 s b. 40 s c. 46 s d. 55 s e. 75 s
Which of these statements is true?
a. a battery produces ac and a generator produces dc b. a battery and a generator produce ac c. a battery and a generator produce dc d. a battery produces dc and a generator produces ac
Kelli examines her new ruby ring with the jeweler's "loop". The ruby appears 7.0 times larger. If her near point is 35. cm, what is the focal length of the lens?
A) 36. mm B) 70. mm C) 67. mm D) 42. mm E) 58 mm