When spiral galaxies do collide, the impact is greatest on their: Group of answer choices globular clusters. giant molecular clouds. galactic nuclei. individual stars. open clusters.

What is the earliest point in the universe that we can observe? why can’t we see back further than this?

Which best represents the law of conservation of mass ?

Apulley system is used to lift a 2,000 newton engine up a distance of 3 meters. the operator must apply a force of 250 newtons to the chain of the pulley system to lift the motor. to lift the engine 3 meters, the operator must pull a total of 30 meters of chain through the pulley system. what is the value of di?