The acceleration due to gravity on the Moon's surface is one-sixth that on Earth. An astronaut's life support backpack weighs 240 lb on Earth. What does it weigh on the Moon?
a. 40 lb
c. 80 lb
b. 120 lb
d. 240 lb
A
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What is thought to be the origin of enormous x-ray flares that occasionally come from the direction of Sgr A*?
A) x-ray binary systems that lie close to the galactic center B) massive-star supernovae near the galactic center C) comet-sized objects being torn apart by the tidal forces of the black hole near the galactic center D) supernova shock waves plowing into dense regions of the interstellar medium near the galactic center
What is so special about Type Ia supernova that make them good distance indicators?
A: they are formed from the death of the most massive stars. B: they are only seen in the distant universe and not nearby. C: their low temperatures prevent the Hubble Space Telescope overheating from bright light sources. D: their luminosities are known. E: they give rise to very large debris that can be seen at large distances.
On the moon, the maria have fewer craters than the highlands
Indicate whether the statement is true or false
What is the average power dissipated by a resistor of resistance R = 25 ? in an LRC circuit for which the power factor is equal to 0.25 and the maximum voltage of the AC source is 8 V?
A) 0.04 W B) 0.32 W C) 0.16 W D) 0.62 W E) 0.08 W