The core, mantle, and crust of a planet are defined by differences in their
A) temperature. B) density. C) strength. D) geological activity.
B
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Power is a vector quantity
Indicate whether the statement is true or false
Cathode rays are
A. x-rays.
B. 
-rays.
C. electrons.
D. protons.
E. neutrons.
A hydrogen atom consists of an electron and a(n):
A) proton. B) ion. C) neutrino. D) neutron. E) lepton.
A spaceship with a mass of 2.8 × 106 kg is traveling toward two asteroids, each with a mass of 5.0 × 1016 kg, which are 40 km apart. Its path is perpendicular to the line joining the asteroids and aimed at the midpoint of that line
What is the net gravitational force exerted by the asteroids on the spaceship when the spaceship is 30 km away from that midpoint? G = 6.67 x 10-11 N•m2/kg2. A) 12,000 N B) 8000 N C) 16,000 N D) 6200 N E) 18,000 N