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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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
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)
What will be an ideal response?
Nations such as Nauru and Tonga are threatened by continued warming
What will be an ideal response?
For three identical lamps in parallel with a 1.5-volt dry cell, the voltage across the lower lamp is
1) 1/2 V. 2) 1 V. 3) 1.5 V. 4) 3 V. If that lamp is disconnected, the other two lamps will 5) glow the same. 6) glow much more brightly. 7) glow much more dimly.