A plane flies directly from city A to city B, which are separated by 2300 mi. From A to B, the plane flies into a 65 mi/h headwind. On the return trip from B to A, the wind velocity is unchanged
The trip from B to A takes less than the trip from A to B. What is the airspeed (assumed constant) of the plane relative to the air (that is, the airspeed)?
A) 530 mi/h B) 610 mi/h C) 480 mi/h D) 400 mi/h
A
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Strictly speaking, Newton's law of universal gravitation, F = Gm1m2/r2, is valid only if the masses are either point masses or ________.
What will be an ideal response?
____ is a set of rules that describes how atoms and subatomic particles behave
a. Kirchhoff's law b. Black body radiation law c. The Coulomb force d. Quantum mechanics e. The binding energy
A substance of unknown composition is heated in a sealed container. As a result, the mass of the container and its contents
a. increases. b. decreases. c. remains the same. d. Any of these could occur.
You are moving at 120 km/h toward a stationary train. The train blows its 0.400-kHz whistle. Take the speed of sound to be 340 m/s. What frequency do you hear?
A) 361 Hz B) 444 Hz C) 364 Hz D) 439 Hz