Which of the following properties can be inferred from the star’s orbital period?
a. the planet’s orbital radius
b. the planet’s mass
c. both the planet’s orbital radius and it's mass
d. neither the planet’s orbital radius nor it's mass
The planet's orbital radius
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Radioactive Decay: The atom 40K decays radioactively to the gas 40Ar. An ancient rock is found to contain enough 40Ar gas to indicate that 77.0% of the 40K in the rock has decayed to 40Ar since the rock solidified. (Any previous argon would have boiled out of liquid rock.) How long ago did the rock solidify? The half-life of 40K is 1.25 billion years.
A. 2.65 billion years B. 0.471 billion years C. 1.80 billion years D. 0.324 billion years
The curved shape of Earth's shadow during an eclipse was evidence for ________.
A. a spherical Earth B. a flat, circular Earth C. a flat, circular Moon D. a spherical Moon E. None of these choices is correct.
What is the ratio of the speed of sound in air at 0°C to the speed at 100° C?
What will be an ideal response?
The electric field shown is produced by a single point charge at the center of the picture
 If a new positive point charge is placed at location A directly to the right of the one pictured, the force on it will a. be zero. b. push it to the right. c. push it to the left. d. be in an unknown direction.