Why do we believe a black hole lies toward Sagittarius?
What will be an ideal response?
A large amount of activity is present. There is evidence of strong magnetic fields, X-ray sources, extremely high stellar densities, an extremely energetic accretion disk, the strongest source of radio waves in the sky, and the stars and gas speed up as you get close to the core.
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Escape Speed: Planet X-39 has a mass equal to 1/3 that of Earth and a radius equal to 1/3 that of Earth. If V is the escape speed for Earth, what is the escape speed for X-39?
A. V B. 3V C. 6V D. V/9 E. 9V
By about how much does the greenhouse effect change the temperature of Earth?
A) 30 K B) 5 K C) ?16 K D) 500 K
How much power does a sphere with a radius of 10 cm radiate into empty space if is has an emissivity of 1.0 and is kept at a temperature of 400 K? (? = 5.67 × 10-8 W/m2 ? K4 )
A) 60 W B) 70 W C) 180 W D) 210 W E) 360 W
Two satellites with equal rest masses of 100 kg are traveling toward each other in deep space. They have identical speeds of 0.600c
The satellites collide and somehow manage to stick together. What is the rest mass of the combined object after the collision? A) 200 kg B) 225 kg C) 250 kg D) 275 kg E) 300 kg