Explain the statement: "At the same pressure, cold air is more dense than warm air."
What will be an ideal response?
Answer: Air molecules in cold air are more densely packed than air molecules in warm air. In cold air, air molecules slow down and crowd close together making the air more dense. When air is warmed, the molecules move faster, they spread farther apart, and the air density decreases.
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Heat is energy that is transferred between objects that are in thermal contact because of a temperature difference
Indicate whether the statement is true or false
A spaceship is moving away from the earth with a constant speed of 0.80c. The spaceship fires a 28-kg missile with a speed of 0.50c relative to the spaceship
What is the speed of the missile measured by observers on the earth if the missile is fired (a) away from the earth? (b) toward the earth?
For the astronauts inside an orbiting space vehicle the force of gravity that acts on them is
A) zero. B) mainly due to Earth below. C) mainly due to the mass of the space vehicle. D) mainly due to nearby planets and stars. E) none of the above
Can you explain when fins may not be advantageous in increasing the heat transfer at a surface?
What will be an ideal response?