What would be the consequence(s) of more frequent collisions between planets and asteroids?
A) Earth and other planets would have more large craters.
B) We would observe more meteor showers.
C) We would find more Martian meteorites on Earth.
D) A and B
E) A and C
E
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Consider a planet orbiting a Sun-like star that has been detected by the Doppler and that has an orbital period of one year. The larger the velocity changes measured for the star, the
A) larger the mass of the planet. B) larger the radius of the planet. C) smaller the mass of the planet. D) smaller the radius of the planet.
Which is larger, a newton or a pound?
a. a newton b. a pound c. This question is nonsense—they don't measure the same physical quantity. d. They are the same size.
A +15-nC point charge is placed on the x axis at x = 1.5 m, and a ?20-nC charge is placed on the y axis at y = ?2.0m. What is the magnitude of the electric field at the origin?
a. 105 N/C b. 15 N/C c. 75 N/C d. 45 N/C e. 60 N/C
What is the radius of the ground state of He+?
A. 0.0529 nm B. 0.193 nm C. 0.0265 nm D. 0.106 nm E. 0.212 nm