Why do Earth rocks have much younger ages than most meteorites?
A) Earth formed billions of years after most meteorites formed.
B) The rocks solidified long after the formation of the solar nebula.
C) The atoms that make up Earth rocks are generally younger than the atoms that make up meteorites.
D) Most meteorites come from other planetary systems that formed before our solar system.
B) The rocks solidified long after the formation of the solar nebula.
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A proton moves across the Earth's equator in a northwesterly direction. At this point the Earth's magnetic field has a direction due north and is parallel to the surface. What is the direction of the force acting on the proton at this instant?
a. toward the northeast c. toward the northwest b. into the Earth's surface d. out of the Earth's surface
One joule is the same as one
A) kilowatt-hour. B) newton-meter. C) meter per second squared. D) watt-meter. E) newton-second.
After a skydiver reaches terminal velocity,
a. the force of gravity no longer performs work on the skydiver. b. work performed by the force of gravity is converted into gravitational potential energy. c. gravitational potential energy is no longer available to the system of the skydiver plus the Earth. d. gravitational potential energy is converted into thermal energy. e. thermal energy is converted into gravitational potential energy.
If a future lander mission to Europa confirms the existence of organic molecules at the surface, the next mission would most likely deploy a probe that resembled
A) a submarine B) a ship C) a car D) an airplane