Air with a density of 1.20 
flows through a 75.0 cm diameter pipe with a velocity of 2.00 m/s. What is the mass flow rate?
A. 0.95 kg/s
B. 1.06 kg/s
C. 1.20 kg/s
D. 1.26 kg/s
E. 1.48 kg/s
B. 1.06 kg/s
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________ occur about 130 km above Earth's surface near the polar regions when energy in the solar wind guided by Earth's magnetic field excites gases in the upper atmosphere
a. Coronas b. Flares c. Auroras d. Coronal holes e. Nuclear fission
Observations of young stars (as well as theory) tell us that when the Sun was young the solar wind
A) was weaker than it is today. B) was stronger than it is today. C) was about the same strength as it is today. D) was nonexistent. E) blew outward only along the Sun's poles.
After a ball tossed upward leaves your hand, the force of gravity on it
A) no longer acts. B) gradually diminishes. C) gradually increases. D) remains constant. E) changes direction.
Suppose we have determined the orbital period of a planet around its star. If we also know the mass of the star, then we can use the planet's orbital period and the star's mass to calculate
A) the planet's average orbital distance. B) mass of the planet. C) eccentricity of the planet's orbit. D) radius of the planet.