A train travels 68 kilometers in 4 hours, and then 91 kilometers in 2 hours. What is its average speed?

A flashlight is an example of an object that is wired in which of the following circuit types?

In very general terms, how do the temperature structures of the atmospheres of venus and mars differ from that of earth?

3) The atomic number of magnesium is 12. This means that its nucleus must contain A) 6 protons and 6 neutrons. B) 6 neutrons and 6 electrons. /C) 12 neutrons and no protons. D) 12 protons and no electrons.

How will a wave change as it moves from a layer of lower velocity into a lower layer of higher velocity?

If someone were to pass you at 90% the speed of light, what would happen?

How do mountins building and volcanos relate to plate motion at convergent boundaries

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.