Has there been signs that time travel exist

What term is used to describe the hot ash, gases, and materials being erupted at speeds of up to 400 mph?

8. What is the rate of change in an object's position?

Which perspective believes that behavior is learned through rewards and punishments

At what temperature (in K) will 1.0 mol of gas occupy 1.0 m3 at a pressure of 1.0 * 10^4 pa

The depth of a pond is determined by a scientist using a sonic ranger. It takes 0.02 seconds for the sound waves to travel to the pond's bottom and back to the boat. The sound waves were reported to be traveling at 1210 m/s.

A 20kg box is dropped 13m. how much work is done

Suppose a person whose mass is m is being held up against the wall with a constant tangential velocity v greater than the minimum necessary. Find the magnitude of the frictional force between the person and the wall

A ball is being rolled by a normal push of 1000N. it is opposed by friction which has a force of 0.3kN and air resistance which has a force of 23N. Calculate the resultant force.

Consider a Young's two-slit experiment in which the wavelength of light is 37% smaller than the distance between the slits.

Which of the following situations would produce an average velocity of zero? A) a round-trip to school and back B) a horse galloping in a field C) the criss-crossing path of a flying bug D) a trip, first to the moon, then onto Mars