A spiral (S or SB) galaxy contains
a. mostly lower-main sequence stars and giants.
b. mostly upper main sequence stars and giants.
c. mostly upper main sequence stars and gas and dust.
d. upper and lower main sequence stars and gas and dust.
e. mostly white dwarfs and supergiants.
D
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As an electron slows down from 0.9980c to 0.5000c, how much momentum does it lose? (c = 3.0 × 108 m/s, melectron = 9.11 × 10-31 kg)
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For three identical lamps in parallel with a 1.5-volt dry cell, the voltage across the lower lamp is
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What is meant by ‘net charge?'
a. the total amount of positive charge on an object b. the total amount of negative charge on an object c. the total amount of neutral charge on an object d. A minus B