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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____ 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
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?
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
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.