The sun radiates at a power of
How long does it take for the sun to lose an amount of mass equal to the mass of the Earth 
Choose the first answer that is correct.
A. less than one year
B. less than 1000 years
C. 
D. 
E. 
D.
Physics & Space Science
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A frictionless simple pendulum on Earth has a period of 1.75 s. On Planet X its period is 2.14 s. What is the acceleration due to gravity on Planet X?
What will be an ideal response?
Physics & Space Science
Intermediate between E7 and Sa galaxies, ________ have a disk but no gas or dust
Fill in the blank(s) with correct word
Physics & Space Science
Alex throws a 0.25-kg rubber ball down onto the floor. The ball's speed just before impact is 4.5 m/s, and just after is 2.9 m/s. What is the change in the magnitude of the ball's momentum?
a. 0.39 kg/m/s b. 1.9 kg/m/s c. 1.1 kg/m/s d. 0.73 kg/m/s e. 7.4 kg/m/s
Physics & Space Science
Flow channels on Venus suggest it was once rich in water
a. True b. False Indicate whether the statement is true or false
Physics & Space Science