A typical neutron star is more massive than our Sun and about the size (radius) of
A) a small asteroid (10 km in diameter).
B) Earth.
C) the Moon.
D) Jupiter.
A) a small asteroid (10 km in diameter).
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The principal axis is the
A) straight line drawn from the center of curvature to the mid point of the mirror. B) straight line drawn from the center of curvature to any point of the mirror. C) straight line drawn from the center of curvature to a point on the outer edge of the mirror. D) straight line joining any two points on the mirror. E) None of the other answers given is correct.
If an electron has a measured wavelength of 0.832 × 10^?10 m, what is its kinetic energy? (h = 6.63 × 10^?34 J?s, 1 eV = 1.6 × 10^?19 J, and me = 9.11 × 10^?31 kg)
a. 7640 eV b. 418 eV c. 334 eV d. 218 eV e. 70 eV
A current in a solenoid coil creates a magnetic field inside that coil. The field strength is directly proportional to:
a. Both A and B are valid choices. c. the coil area. b. the current. d. None of the above choices are valid.
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.