An electron with a speed of 2.0 × 10^6 m/s moves into a uniform electric field of 325 N/C that is parallel to the electron's motion. How long does it take to bring the electron to rest? (me = 9.11 × 10^-31 kg, e = 1.6 × 10^-19 C)
a. 3.5 × 10^-8 s
c. 2.3 × 10^-8 s
b. 2.3 × 10^-6 s
d. 1.2 × 10^-7 s
A
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We know that giant stars are larger in diameter than the sun because
a. they are more luminous but have about the same temperature. b. they are less luminous but have about the same temperature. c. they are hotter but have about the same luminosity. d. they are cooler but have about the same luminosity. e. they have a larger absolute magnitude than the sun.
We can best understand how a diver is able to control his rate of rotation while in the air (and thus enter the water in a vertical position) by observing that while in the air
A) his linear momentum is constant. B) his potential energy is constant. C) his kinetic energy is constant. D) his angular momentum is constant. E) his total energy is constant.
With respect to the silica content of the parent rock, what type of magma does partial melting produce?
What will be an ideal response?
The primary difference between infrared and visible light is that
A. infrared travels faster than visible light. B. they have different wavelengths. C. they have different amplitudes. D. no materials currently known have the ability to reflect infrared. E. infrared does not have a magnetic field associated with its electric field.