What is the primary visible color of an emission nebula?

Write an Hypothesis whether land or water heats faster

Solar winds have an influence all the way to about 160 AU from the Sun. About how many kilometers is that? A. 24,000,000,000 km B. 48,000,000,000 km C. 240,000,000,000 km D. 480,000,000,000 km

Which stage occurs just before ignition in an internal combustion engine?

I dont get ohm's law

When you throw a ball the work you do to accelerate it equals the kinetic energy the ball gains?

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