A person whose weight is 510 N is being pulled up vertically by a rope from the bottom of a cave that is 39.2 m deep. The maximum tension that the rope can withstand without breaking is 593 N. What is the shortest time, starting from rest, in which the person can be brought out of the cave

Awave is produced in a rope. the wave has a speed of 33 m/s and a frequency of 22 hz.

The star betelgeuse is about 600 light-years away. if it explodes tonight, a. we'll know because debris from the explosion will rain down on us from space.b. we'll know it immediately because it will be brighter than the full moon in the sky.c. we won't know about it until 600 years from now.d. none of the above.

Could we see a galaxy that is 20 billion light-years away?