Partially decomposed organic matter in the soil is
What will be an ideal response?
Humus
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While on the main sequence a star's primary energy source comes from
a. nuclear fusion. b. nuclear fission. c. gravitational potential energy. d. magnetic fields.
Six seconds after starting from rest, a freely-falling baseball has a speed of
A) 10 m/s. B) 30 m/s. C) 60 m/s. D) 70 m/s.
Would you be richer if you had a hunk of gold whose weight is 1 newton on the moon, or one whose weight is 1 newton on Earth, and why?
A) 1 newton on the moon, because then the gold's weight on the moon would be larger. B) 1 newton on the moon, because then the gold's mass would be larger. C) 1 newton on Earth, because then the gold's mass would be larger. D) 1 newton on Earth, because then the gold's weight on Earth would be larger. E) It wouldn't make any difference, because the amount of actual gold would be the same in both cases.
A spaceship leaves Earth at a steady forward speed of 70% the speed of light. How fast relative to the ship must the spaceship launch a shuttlecraft in the forward direction so that it will be moving away from Earth at 98.7% the speed of light?
A) 0.91c B) 0.97c C) 0.93c D) 0.99c E) 0.84c