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Our sun orbits around the center of our galaxy (the Milky Way) once every 2.5 x 108 years. The radius of the sun's orbit about the center of the galaxy is approximately 3.15 x 1020 m. The sun has made only about 20 revolutions since the Earth was formed over 3 billion years ago! The centripetal force keeping our sun in orbit is supplied by the force of gravity. Calculate the mass of the galaxy.
(ans. 2.98 x 1041 kg)
Can someone help me reach the answer
A 0.5-kg rubber ball is dropped from rest a height H = 19.6 m above the surface of the Earth. It strikes the sidewalk below and rebounds up to a maximum height of 4.9 m. If the magnitude of the average force the sidewalk exerts on the ball during ..
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If a capacitor has been left in a steady circuit for a long time, what can you say about the current going through it? The circuit below has been left on for a long time. What is the voltage across the capacitor? (Hint, it is not 5V)
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