Which of these is the Galilean principle of relativity?
a. E = mc2.
b. Energy cannot be created or destroyed.
c. The laws of motion are the same in all reference systems.
d. The laws of motion are the same in all inertial reference systems.
e. The laws of motion only apply in inertial reference systems.
d
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If a current of 2.4 A is flowing in a cylindrical wire of diameter 2.0 mm, what is the average current density in this wire?
A) 7.6 × 105 A/m2 B) 5.2 × 10-6 A/m2 C) 1.9 × 105 A/m2 D) 3.6 × 105 A/m2 E) 21 × 10-6 A/m2
The intensity of an electromagnetic wave is 8 × 107 W/m2. What is the amplitude of the magnetic field of this wave?
A) 8.2 × 10-4 T B) 3.3 × 10-7 T C) 10 T D) 14 T E) 5.8 × 10-4 T
Measuring the changing light output of a star to search for exoplanets is called ________.
A. spectroscopy B. the Doppler method C. the transit method D. gravitational lensing
In beta minus decay, the number of neutrons in the nucleus
A) is decreased by 1. B) is decreased by 2. C) is increased by 1. D) is increased by 2. E) remains unchanged.