What does the pitch of a sound wave depend on?
What will be an ideal response?
Answer: The frequency.
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What is the source of luminosity for protostars that have not yet become hot enough for fusion in their cores?
A) light absorbed from nearby stars B) energy released by infalling matter C) fusion in their low-density outer layers D) fission from concentrated radioactive elements
Briefly explain Earth's moon
What will be an ideal response?
A projectile is fired into the air at an angle of 50° above ground level and hits a target downrange. It will also hit the target if fired at an angle of
A) 40°. B) 45°. C) 55°. D) 60°. E) none of the above
In the Drude model of electrical conduction, the current density is directly proportional to
a. the average time interval between successive collisions. b. the number of charge carriers per unit volume. c. the square of the electron charge. d. the electric field present in the wire. e. the product of all four quantities listed above.