Briefly explain how an impact event 65 million years ago could have caused the extinction of the dinosaurs
What will be an ideal response?
It could have kicked up enough dust to darken the sky for years, causing a substantial decrease in plant life. This would have disrupted the food chain. As a result, the large, herbivorous dinosaurs would not have found enough plants to eat and the carnivorous dinosaurs would have perished as a result of a substantial decrease in other animals to eat.
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A planet (or comet) will speed up as it approaches the Sun
Indicate whether the statement is true or false
If three samples have the half-lives listed below, which is the most radioactive?
A) a sample with a half-life of 20 minutes B) a sample with a half-life of 20 hours C) a sample with a half-life of 20 years D) a sample with a half-life of 20 million years E) none of the above
A photograph of the two-dimensional elastic collision of two particles shows a particle of mass m1 approaching a stationary particle of mass m2
As a result of their interaction, the incident particle moves away along a line that makes an angle of 30° with its original path, and the other particle moves away along a line that makes an angle of 30° to the other side of the original path of the incident particle. What is the ratio of the masses, m1/m2? A) 0.5 B) 1 C) 2 D) 3 E) 4
Which of the following statements about the celestial equator is true at all latitudes?
A) It extends from your horizon due north, through your zenith, to your horizon due south.
B) It cuts the dome of your local sky exactly in half.
C) It represents an extension of Earth's equator onto the celestial sphere.
D) It lies along the band of light we call the Milky Way.
E) It extends from your horizon due east, through your zenith, to your horizon due west.