how do scientists know that black holes exist A. by running experiments on the sun B. by observing objects and light around black holes C. by viewing black holes with powerful telescopes D. all of the above E. none of the above

The measure of a spring's resistance to being compressed or stretched is the

A projectile is launched vertically at 100 m/s. If air resistance can be ignored, at what speed will it return to its initial level?

1) The "Ring of Fire" is an area along the edge of the Pacific Ocean with many volcanoes. Most of the volcanoes are formed as a result of one tectonic plate.

A 0.22 kg air track glider moving at 0.60 m/s a collides elastically into a 0.44 kg glider at rest. After collision the 0.22 kg glider is moving with velocity - 0.20 ms. What is the speed of the 0.44 kg glider after collision

What are the two of the directional forces in a projectile motion

If there are many forces acting on an object, how can the net force be 0:

What is a planetary nebula? a. leftover gas from a supernova explosion b. the ejected envelope of a giant star surrounding the remnant of a star c. a type of young, medium-mass star d. a planet surrounded by a glowing shell of gas e.

A train is moving 4.82 m/s when it begins to accelerate. After 24.8s it is moving 7.09m/s how far did it move in that time

List three different emotions?

The jet stream flows from east to west across the United States. True False