On an H-R diagram, a protostar would be:
A) above and to the right of the main sequence.
B) below and to the left of the main sequence.
C) below and near the right side of the main sequence.
D) above and near the upper left of the main sequence.
E) on the main sequence at the extreme lower right.
A
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Water surrounds hot horizontal tubes 3 cm in diameter in a nuclear steam generator having surface temperature of 800ºC. The water is at a pressure of 800 kPa. If film boiling is assumed, estimate the total convection heat transfer coefficient between the water and the tube surfaces.
What will be an ideal response?
Which planet did Galileo observe go through a complete set of phases, thus proving the Ptolemaic model wrong?
a. Saturn b. Jupiter c. Mars d. Venus e. Mercury
Suppose that the planet Mercury were magically replaced with a baseball. The magnitude of the acceleration of the baseball would be
A. equal to that of Mercury B. greater than that of Mercury C. less than that of Mercury
A ringing alarm clock is placed in a bell jar, which is then sealed, and the air is pumped out of it. Which effect will most likely occur?
1.The sound of the ringing alarm clock will get louder as the air is pumped out. 2.The sound of the ringing alarm clock will get softer as the air is pumped out. 3.No noticeable change will occur as the air is pumped out. 4.The sound will diminish completely immediately after the air has begun to be pumped out.