The chromosphere of the Sun has a higher temperature than the photosphere
a. True
b. False
Indicate whether the statement is true or false
True
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A planetary nebula
a. produces an absorption spectrum. b. produces an emission spectrum. c. is contracting to form planets. d. is contracting to form a star. e. is the result of carbon detonation in a 1- star.
A mass src="https://sciemce.com/media/4/6823b3c5c6c7cd8234.png" class="w-image" />?
is connected by a light string that passes over a pulley of mass M to a mass 
sliding on a frictionless horizontal surface as shown in the figure. There is no slippage between the string and the pulley. The pulley has a radius of 25.0 cm and a moment of inertia of 1?2 
If 
is 4.00 kg, 
is 4.00 kg, and M is 4.00 kg, then what is the acceleration of
A. 4.42 
B. 3.92
C. 3.42
D. 3.04
E. 2.96
Briefly describe how a nova event occurs
What will be an ideal response?
The pressure at the bottom of a glass filled with water (? = 1 000 kg/m3) is P. The water is poured out and the glass is filled with ethyl alcohol (? = 806 kg/m3). The pressure at the bottom of the glass is now
1.smaller than P. 2.equal to P. 3.larger than P. 4.indeterminate.