Galaxy A is 200 Mpcs from Galaxy B. Hubble's Law says that V = H0 × D. About how fast is Galaxy A receding from the perspective of Galaxy B? Use a value of 75 km/s/Mpc for Hubble's constant.
a) 75 km/s
b) 75000 km/s
c) 7500 km/s
d) 150 km/s
e) 15000 km/s
Ans: e) 15000 km/s
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If 50 kJ of heat flows into a system and 35 kJ of work is done by the system, then what is the change in internal energy?
A. 85 kJ B. 70 kJ C. 65 kJ D. 15 kJ E. 10 kJ
The figure above shows the geological time scale of Earth. The K-T event that marks the extinction of the dinosaurs occurred approximately ________ years ago.
A) 65 million B) 10 million C) 650 million D) 100 million
How do we know the Sun within our solar system is not a first generation star born right after the Big Bang?
a. There are observations of stars in the place of our Sun that predate the Sun. b. There are elements present in our solar system that are only formed by stars that lived and died long ago. c. The solar system is in a specific region within the Milky Way Galaxy where many stars are known to have been present earlier.
NASA uses the famous "Vomit Comet," a KC-135 cargo plane, to provide astronauts and scientiest a simulated zero-gravity environment. The plane flies in a parabolic arc, at the top of which a passenger feels "weightless." This is because
A. the acceleration of the passenger is nearly zero at the top of the arc B. the gravitational force exerted by Earth on the passenger is nearly zero at the top of the arc C. the force exerted by the floor of the plane on the passenger is nearly zero at the top of the arc D. a and b