Globular clusters contain mostly blue stars
Indicate whether the statement is true or false
FALSE
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Asteroid impacts large enough to cause mass extinction on Earth occur roughly once every 100 million years. Use that fact to estimate the probability that such an event will occur in your lifetime, which you can take to be approximately 100 years. What's your estimate of that probability?
A) 1 in 100,000,000 B) 1 in 10,000 C) 1 in 1,000,000 D) 1 in 100,000,000,000
Compared to spiral galaxies, elliptical galaxies have
A. ...more gas, more dust, and less new star formation. B. ...less gas, more dust, and more new star formation. C. ...less gas, less dust, and more new star formation. D. ...more gas, more dust, and more new star formation. E. ...less gas, less dust, and less new star formation.
The fact that Venus' atmosphere contains carbon dioxide was discovered:
A) by the Magellan spacecraft. B) in early spectroscopic studies. C) by the Venera spacecraft. D) in radar studies. E) through CCD imagery.
When a net horizontal force of 250 N acts on a 50-kg cart that is free to roll on a level surface,
A. the cart accelerates at 12500 m/s2. B. the cart accelerates at 9.8 m/s2. C. the cart accelerates at 5 m/s2. D. the cart accelerates at 0.20 m/s2. E. the cart does not accelerate because it pushes back on the person with a force of 250 N.