Energy balance in the Sun refers to a balance between ________
A) the force of gravity pulling inward and the force due to pressure pushing outward
B) the amount of energy the Sun radiates into space and the amount of energy that reaches Earth
C) the rate at which fusion generates energy in the Sun's core and the rate at which the Sun's surface radiates energy into space
D) the mass that the Sun loses each second and the amount of mass converted into energy each second
C
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Air flows through a 1 cm diameter tube at 8 m/s. The air is at 40ºC and the tube is 100ºC. If the tube is 3.5 m long determine, a) the entrance length for developed flow and b) heat transfer to the air.
What will be an ideal response?
Lonnie pitches a baseball of mass 0.500 kg. The ball arrives at home plate with a speed of 35.0 m/s and is batted straight back to Lonnie with a return speed of 50.0 m/s. If the bat is in contact with the ball for 0.055 s, what is the impulse experienced by the ball?
a. 7.50 N/s b. 42.5 N/s c. 773 N/s d. 17.5 N/s e. 25.0 N/s
The heat capacity at constant volume and the heat capacity at constant pressure have different values because:
A. heat increases the temperature at constant volume but not at constant pressure B. heat increases the temperature at constant pressure but not at constant volume C. the system does work at constant volume but not at constant pressure D. the system does work at constant pressure but not at constant volume E. the system does more work at constant volume than at constant pressure
The oldest pulsars are billions of years old
a. True b. False Indicate whether the statement is true or false