A 6.5-g iron meteor hits the earth at a speed of 295 m/s. If its kinetic energy is entirely converted to heat in the meteor, by how much will its temperature rise? The specific heat of iron is 113 cal/kg ? C°, and 1 cal = 4.186 J
A) 92.0 C°
B) 57,100 C°
C) 0.147 C°
D) 384 C°
A
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A 10 kg sphere with a 25.0 cm radius has a moment of inertia of 2/5 
If a torque of 2.0 N•m is applied to the object, the angular acceleration is
A. 1.0 
B. 2.0
C. 4.0
D. 6.0
E. 8.0
In a(n) ______ live chat, visitors initiate the chat.
A. proactive B. agent C. sidebar D. broadcast
Each choice below describes how a few astronomical phenomena are related to time periods. Which list is entirely correct? (Careful: some lists are partially correct.)
A) Earth's rotation defines a day. The saros cycle of eclipses defines a month. Earth's orbit defines a year. Earth's cycle of axis precession takes 26,000 years. B) Earth's rotation defines a day. The cycle of the Moon's phases takes about a month. Earth's orbit defines a year. Earth's cycle of axis precession takes 26,000 years. C) Earth's rotation defines a day. The cycle of the Moon's phases takes about a week. Earth's orbit defines a year. Earth's cycle of axis precession defines a month. D) Earth's rotation defines a day. The Sun's rotation defines a week. The Moon's rotation defines a month. Earth's orbit defines a year.
What are the three main parts of our Galaxy?
What will be an ideal response?