Type II supernovae and star forming regions are related to one another because:
A) they both contain ionized hydrogen.
B) they both involve high mass ionizing stars.
C) the shock waves of a supernova can trigger star formation.
D) as a result of both processes, lighter elements are transformed into heavier elements.
E) All of the above.
E
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If a star 100 light-years away explodes, the time for the gravitational waves to reach Earth is 100 years as measured from
A) any uniformly moving reference frame. B) any accelerating reference frame. C) any reference frame, accelerated or not. D) the reference frame of the waves. E) Earth.
An astronaut in orbit around Earth drops her pen, and it floats gently next to her hand. Why does it not fall to the floor?
A. There is no gravity in space. B. The net force on the pen is zero. C. The gravitational pull is very weak at typical altitudes for orbiting spacecraft. D. Objects in orbit have no mass. E. All objects in the spacecraft are falling toward Earth at the same rate.
Calculate the linear speed due to the Earth's rotation for a person at 40° north latitude on the Earth. The radius of the Earth is 6.40 × 10^6 m
a. 74.0 m/s c. 465 m/s b. 356 m/s d. 73.0 m/s
What is a short circuit?
a. A path with a very high resistance. b. A path with a very low resistance. c. A circuit with a very short path. d. Any incorrectly wired circuit. e. An electrical circuit that behaves unpredictably.