In an adiabatic free expansion
a. no heat is transferred between a system and its surroundings.
b. the pressure remains constant.
c. the temperature remains constant.
d. the volume remains constant.
e. the process is reversible.
A
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We can apply the equation Ft = change in (mv) to the case of a baseball player striking a pitched ball. To impart the maximum change in momentum, mv, to the ball, the batter hits the ball with the greatest force he can muster and he also
1) extends the time of contact as much as possible by "following through." 2) makes the time of contact as short as possible, thereby increasing the force. 3) none of the above! In the impulse-momentum equation applied to hitting the ball, the "v" represents 4) the velocity of the bat. 5) the velocity of the ball. 6) a vector quantity.
What is the most compelling piece of evidence that suggests that the dinosaurs were made extinct by the impact of an asteroid 65 million years ago?
A) a layer of sediment laid down at that time which is littered with dinosaur fossils B) dinosaur fossils are found in rock layers older than 65 million years but not younger than 65 million years C) a layer of sediment laid down at that time which is rich in the element Iridium (Ir), an element common in asteroids but less common on the Earth D) the crater from this impact can still be seen in the deserts of Arizona
The volume of water displaced by a floating 20-ton boat is
A) 20 cubic meters. B) the volume of 20 tons of water. C) the volume of the boat. D) depends on the shape of the ship's hull. E) none of the above
How does a rocket launch upward? Choose the statement that correctly answers the question.
A) By expelling gas downward, the rocket is propelled upward. B) Expelling gas downward, which by pushing against the ground, propels the rocket upward.