The formation of carbon requires a core temperature of about 100 million K, but iron takes much higher temperatures and pressures
Indicate whether the statement is true or false
TRUE
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From a molecular point of view, explain why evaporation is a cooling process. What cools?
What will be an ideal response?
A particle is moving with a constant acceleration of 4.0 m/s2 . Its speed at t = 1.0 s is 4.0 m/s and at t = 3.0 s it is 12.0 m/s. What is the area under the position-time graph for the interval from t = 1.0 s to t = 3.0 s?
a. 8.0 m/s b. 8.0 m c. 12 m d. 16 m e. 16 m/s2
A metallic coin is given a negative electric charge. Its mass:
1.increases measurably. 2.increases by an amount too small to measure directly. 3.remains unchanged. 4.decreases by an amount too small to measure directly. 5.decreases measurably.
A CD is made with a plastic coating with index of refraction n and is used with a laser that produces a wavelength l in the plastic. Which of the following pit depths would produce the desired destructive interference in this situation?
a. l/2n c. l/4n b. l/4 d. l/2