According to our modern understanding, what is a nova?
A) an explosion on the surface of a white dwarf in a close binary system
B) the explosion of a massive star at the end of its life
C) the sudden formation of a new star in the sky
D) a rapidly spinning neutron star
A
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HII regions are found near stars cooler than 25,000 K because large amounts of ultraviolet photons would totally destroy the hydrogen atoms in the gas
a. True b. False Indicate whether the statement is true or false
Water ripples are produced by making a cork oscillate up and down at a frequency of 5 Hz. The peaks of the ripples are 0.03 meters apart. What is the speed of the water ripples?
Mafic characteristics
What will be an ideal response?
All electric devices are required to have identifying plates that specify their electrical characteristics. The plate on a certain steam iron states that the iron carries a current of 6.00 A when connected to a source of 1.20 × 102 V. What is the resistance of the steam iron?
1.0.050 0 W 2.20.0 W 3.36.0 W