Which of the following is the most basic definition of a greenhouse gas?
A) a gas that reflects a lot of sunlight
B) a gas that keeps warms air from rising, and therefore warms the surface
C) a gas that absorbs infrared light
D) a gas that makes a planet much hotter than it would be otherwise, even in small amounts
C
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A boy throws a ball with an initial velocity of 25 m/s at an angle of 30° above the horizontal. If you neglect air, how high above the projection point is the ball after 2.0 s?
A) 5.4 m B) 13 m C) 25 m D) 43 m E) 50 m
One light-year is about 10 trillion kilometers
Indicate whether the statement is true or false
A hockey puck slides off the edge of a table with an initial velocity of 20.0 m/s. The height of the table above the ground is 2.0 m. What is the magnitude of the velocity of the puck just before it touches the ground?
A) 21 m/s B) 22 m/s C) 24 m/s D) 25 m/s E) 6.3 m/s
A 500-W device is connected to a 120-V ac power source. What rms current flows through this device?
A) 4.2 A B) 5.9 A C) 120 A D) 150 A E) 170 A