Listed following are some distinguishing characteristics of comets, meteors, and asteroids. Match these to the appropriate category of objects.
What will be an ideal response?
Answer:
Comets:
Form a coma when near the sun
visible in the sky as a fuzzy patch of light that rises and sets with the stars
most are located either in Kuiper belt of Oort cloud
Meteors:
visible in the sky as a bright streak of light for only a few seconds
dust particles entering Earth's atmosphere at high speeds
Asteroids:
compositions similar to that of terrestrial plants
typically orbit the sun at approximately 3 Au
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What percentage of the surface of Venus could be characterized as continental-sized highlands?
A) less than 10% B) about 30%, like the Earth C) 45% D) 75% E) 100%
You are in a spaceship moving past Earth at nearly lightspeed and you observe Mort, who is on Earth. You measure his mass, pulse rate, and size. How are they different from the values measured by Mort himself?
A) Mass has decreased, pulse rate has speeded up, and size is reduced along the direction of motion. B) Mass has increased, pulse rate has speeded up, and size is reduced along the direction of motion. C) Mass has increased, pulse rate has slowed down, and size is reduced along the direction of motion. D) They are unchanged, i.e., they are normal. E) Mass has decreased, pulse rate has slowed down, and size is reduced along the direction of motion.
While running, a person dissipates about 0.6 J of mechanical energy per step per kilogram of body mass. If a 60-kg person runs with a power of 70 Watts during a race, how fast is the person running? Assume a running step is 1.5 m long