A closed surface contains the following point charges: 6 C, -4 C, –2 C, –4 C. The electric flux coming out of the surface is:
a. 16 C/eo.
c. –16 C/eo.
b. –4 C/eo.
d. 4 C/eo.
B
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Circular Motion of Charges: An electron moving perpendicular to a uniform magnetic field of 0.22 T moves in a circle with a speed of 1.5 × 107 m/s. What is the radius of the circle? (e = 1.60 × 10-19 C, melectron = 9.11 × 10-31kg)
A. 1.5 mm B. 0.22 mm C. 2.2 mm D. 0.39 mm E. 3.9 mm
An astronaut tosses a ball out in space where gravitational forces may be neglected. What will happen to the ball?
a. It will stop as soon as the force the astronaut gave it is used up. b. It will stop when the energy the astronaut gave it runs out. c. It will stop after a short time because there is no gravity to keep it moving. d. It will move in a circle like a boomerang. e. It will be slowed down very gradually by collisions with molecules in space.
Name the four layers of the Earth's atmosphere, going up from the surface
What will be an ideal response?