Each rolling wheel of a railroad train is tapered. Compared with the wide part, the narrow part of the wheel has a tangential speed that is
A) less.
B) greater.
C) the same for both.
Answer: A
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Which of the following air masses does not directly
affect U.S. weather? a)cT b)mT c)mE d)mA
Faraday's Law: A coil of wire containing N turns is in an external magnetic field that is perpendicular to the plane of the coil and it steadily changing. Under these circumstances, an emf ? is induced in the coil. If the rate of change of the magnetic field and the number of turns in the coil are now doubled (but nothing else changes), what will be the induced emf in the coil?
A. 2? B. ?/2 C. 4? D. ?/4 E. ?
When a 100-kg astronaut ejects 0.1 kg of gas at a speed of 50 m/s from her propulsion pistol, her recoil speed is
A) 50 m/s. B) 5.0 m/s. C) 0.5 m/s. D) 0.05 m/s.
Order the materials from smallest refractive index to largest refractive index.
=Air =Diamond =Glass =Quartz =Water