The period of an oscillating weight on a spring in an inertial frame of reference is 0.80 s. What would be its speed if it were to move by an observer who measures its period as 1.2 s? (c = 3.00 × 10^8 m/s)
a. 2.5 × l08 m/s
c. 2.9 × 10^8 m/s
b. 1.1 × l08 m/s
d. 2.2 × 10^8 m/s
D
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A 50-turn circular coil (radius = 15 cm) with a total resistance of 4.0 W is placed in a uniform magnetic field directed perpendicularly to the plane of the coil. The magnitude of this field varies with time according to B = A sin (at), where A = 80 mT and a = 50p rad/s. What is the magnitude of the current induced in the coil at t = 20 ms?
a. 11 mA b. 18 mA c. 14 mA d. 22 mA e. zero
If you do an experiment on Earth, and then do an identical experiment in a jet plane moving uniformly at a high speed, you get identical results from both experiments. This is an example of __________
Fill in the blank(s) with correct word
The number of protons in a neutral atom is balanced by an equal number of
A) electron shells that surround the nucleus. B) neutrons in the nucleus. C) orbital electrons. D) none of the above
All of the following statements about the Sun's corona are true. Which one explains why it is a source of X-rays?
A) The temperature of the corona's gas is some 1 to 2 million Kelvin. B) The corona lies above the visible surface of the Sun. C) The corona's gas consists mostly of hydrogen and helium. D) The corona's structure is largely shaped by magnetic fields.