Which unmanned craft is used to collect data about bodies in space?

The electromagnetic waves having the highest speed in free space are

The movement of the tectonic plates is caused by A) convection currents in Earth's mantle. B) the gravity of the iron-nickel core. Eliminate C) the rotation of the Earth. D) the Moho discontinuity.

Which is the correct reasoning for why a gamma ray telescope located in Antarctica that is to be used to look for evidence of black holes in the centers of galaxies would not get funded?

How does the north pole of a magnet respond to the poles of other magnets?

An alternating current consists of charges that?

T=2π√ (l/g) is dimensionally correct

A penny falls from a windowsill which is 25.0 m above the sidewalk. How much time does a passerby on the sidewalk below have to move out of the way before the penny hits the ground?

Show that the Newton has the units of mass times acceleration.

Light travels at 150000000km from the sun to earth in 8 minutes. What speed is this in Km/s

Electricity problem (coulomb's law)