What happened to the "Impactor" of the Deep Impact mission?
A) It landed safely on the surface of the comet and returned material to Earth.
B) It blasted the comet apart, thus preventing a potential Earth collision.
C) It blasted straight through the comet leaving a small hole.
D) It created a small crater on the comet.
E) It missed the comet altogether.
D
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Mort stands on Earth. Velma moves away from him in a rocket, at 299,000 km/s (1000 km/s slower than lightspeed). Mort sends a laser beam toward Velma. As the tip of the beam passes her rocket, Velma observes that
A) the laser beam moves past her at just 1000 km/s. B) the laser beam moves past her at 300,000 km/s. C) Both of the above. D) the laser beam never catches up with her. E) Mort has turned into a giant frog.
The theory that Mercury shrank slightly when it was young has been proposed to explain
a. extended lava plains. b. large craters. c. magnetic field. d. lobate scarps. e. regolith.
A narrow copper wire of length L and radius b is attached to a wide copper wire of length L and radius 2b, forming one long wire of length 2L
This long wire is attached to a battery, and a current is flowing through it. If the electric field in the narrow wire is E, the electric field in the wide wire is A) E. B) 2E. C) 4E. D) E/2. E) E/4.
If you toss a ball straight upward at 40 m/s with no air resistance, one second before it reaches the top of its path its speed is
A) zero. B) 10 m/s. C) 20 m/s. D) 30 m/s E) 40 m/s.