Study guides, Class notes & Summaries

What two properties of a planet affect the gravity we feel on its surface? - Answer- Mass and radius Two planets have the same radius. If Planet A is 5 times more mass than Planet B, how does gravity differ on the surfaces of the two planets? - Answer- Gravity is 5 times stronger on planet A Say that there were a planet X in our Solar System with a mass 1/4 the mass of Earth and a radius 1/2 the radius of Earth. How will the gravity on its surface compare to the surface gravity of Earth? -...

Decide if the sample is representative (or not) of the population for the question of interest. Question: Average daily hours of sleep over a one-year period. Sample: Hours of sleep for 100 randomly selected students the night before an exam. Population: All students in the university. CORRECT ANSWER Not representative A randomly selected sample of 1,000 college students was asked whether they had ever used the drug Ecstasy. Sixteen percent (16% or 0.16) of the 1,000 students surveyed said th...