If two stars are the same temperature, how can one be more luminous than the other?
A. It can be closer.
B. It can be a different spectral type.
C. It can have stronger magnetic fields.
D. It can have a larger radius.
E. It can have a larger reaction rate in the core.
Ans: D. It can have a larger radius.
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Using the mass balance Equation 8-10 of the steady state reaction of oxygen and hydrogen to produce water at a rate of 10 moles per minute, identify the rates of mass flow for O2, N2, and H2O. Also identify the mass generation rates for oxygen, nitrogen, and water.
If life exists on Mars today, it will most likely be found
A) on the surface B) at the center of the planet C) beneath the surface where liquid water may still exist D) floating high in the atmosphere
A box is pushed across a rough horizontal floor by a force acting parallel to the floor in the direction of motion. A force doing negative work on the body is
A. friction. B. gravity. C. the applied force. D. the normal reaction force of the floor upward on the body. E. a fictitious force.
At what temperature is the Celsius scale reading equal to twice the Fahrenheit scale reading?
a. ?12.3°F b. ?24.6°F c. ?12.3°C d. ?6.1°C e. ?20°F