The gravitational force between two objects can be described using the equation Fg = G M1 M2 / d2. In this equation, what does G represent?
A) the universal gravitational constant
B) the density of the smaller object
C) the distance between the two objects
D) the gravitational mass of the larger object
A) the universal gravitational constant
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A CD with a diameter of 12.0 cm starts from rest and with a constant angular acceleration of 1.0 
acquires an angular velocity of 5.0 rad/sec. The CD continues rotating at 5.0 rad/sec for 15.0 seconds and then slows to a stop in 12.0 second with a constant angular deceleration. What is the centripetal acceleration of a point 4.0 cm from the center at the time 15.0 seconds from the start?
A. 0.5 
B. 1.0
C. 1.8
D. 2.0
E. 2.6
An automobile engine operates between a high temperature set by the burning of gasoline and the low temperature of the outside environment. If the engine has been running for some time, the engine is most efficient on ________ (hot or cold) days.
Fill in the blank(s) with the appropriate word(s).
A Styrofoam spherical container having a 1 inch thick wall and 2 foot diameter holds dry ice (solid carbon dioxide) at -85ºF. If the outside temperature is 60ºF, estimate the heat gain in the container and establish the temperature distribution through the 1 inch wall.
What will be an ideal response?
The sun's X-ray and ultraviolet light output is greater than what we would expect based on the photosphere's temperature
Indicate whether the statement is true or false