Clocks on a spaceship moving at high speed relative to the Earth run more slowly when viewed from
A) within the spaceship.
B) Earth.
C) both of these
D) neither of these
Answer: B
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Sunspots are cooler than the surrounding solar surface because
A) they are regions where convection carries cooler material downward. B) strong magnetic fields slow convection and prevent hot plasma from entering the region. C) magnetic fields trap ionized gases that absorb light. D) there is less fusion occurring there. E) magnetic fields lift material from the surface of the Sun, cooling off the material faster.
Charge carriers in a metal are electrons rather than protons because electrons are
A) negative. B) smaller. C) loosely bound. D) none of the above
Two objects of the same mass move along the same line in opposite directions
The first mass is moving with speed v. The objects collide, stick together, and move with speed 0.100v in the direction of the velocity of the first mass before the collision. What was the speed of the second mass before the collision? A) 1.20v B) 10.0v C) 0.900v D) 0.800v E) 0.00v
In organic molecules, a sulfur atom will normally form how many bonds?
a. 0 b. 1 c. 2 d. 3 e. 4