Black light is a common name for the region of the EMR spectrum known as ______________
Fill in the blank(s) with correct word
ultraviolet
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When helium fusion begins in a one solar mass main star, it begins gradually, with this rate slowly increasing over time
Indicate whether the statement is true or false
The cores of the terrestrial worlds are made mostly of metal because
A) the terrestrial worlds as a whole are made mostly of metal. B) metals sunk to the centers a long time ago when the interiors were molten throughout. C) the core contained lots of radioactive elements that decayed into metals. D) over billions of years, convection gradually brought dense metals downward to the core.
Two identical balls are at rest and side by side at the top of a hill. You let one ball, A, start rolling down the hill. A little later you start the second ball, B, down the hill by giving it a shove. The second ball rolls down the hill along a line parallel to the path of the first ball and passes it. At the instant ball B passes ball A:
a. it has the same position and the same velocity as A. b. it has the same position and the same acceleration as A. c. it has the same velocity and the same acceleration as A. d. it has the same displacement and the same velocity as A. e. it has the same position, displacement and velocity as A.
Two cylinders, one made of lead (density 11340 
and one of copper (density 8940
have the same radius and height. When thrown into a pool of water (density 1000
as the two are sinking to the bottom, describe the buoyant forces on the cylinders.
A. The buoyant force on the lead cylinder is greater than that on the copper. B. There is no buoyant force on either, as they are sinking. C. The buoyant force on the copper cylinder is greater than that on the lead. D. The buoyant force is the same on each cylinder.