If an object of mass 20 kg on earth is sent to the moon it will have a mass of
A. 10 kg.
B. 20 kg.
C. 0.0 kg.
D. 4.0 kg.
B. 20 kg.
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Which star evolves off the MS first if all formed at once?
A: O-type star B: 9000K surface temperature star C: a star twice as massive as the Sun D: a star with a radius 0.3 times the Sun E: an M-type star
Why is Supernova 1987A particularly important to astronomers?
A) It occurred only a few dozen light-years from Earth. B) It provided the first evidence that neutron stars exist. C) It was the first supernova detected in nearly 400 years. D) It provided the first observational evidence that supernovae actually occur. E) It was the nearest supernova detected in nearly 400 years.
Three capacitors, of capacitance 5.00 ?F, 10.0 ?F, and 50.0 ?F, are connected in series across a 12.0-V voltage source. (a) How much charge is stored in the 5.00-?F capacitor? (b) What is the potential difference across the 10.0-?F capacitor?
What will be an ideal response?
A person's eye lens is 2.7 cm away from the retina. What must the focal length of this lens be in order for an object placed at the near point (N = 25.0 cm) of the eye to focus on the retina?
A) -3.4 cm B) -2.4 cm C) 2.4 cm D) 3.4 cm E) 2.6 cm