Scientists think that about 245 million years ago, the continents were joined in a single landmass known as gondwana.

true or false?

Wavelength,frequency,and energy are related.what happens to a wave as it’s wavelength gets shorter?

A1-lb collar is attached to a spring and slides without friction along a circular rod in a vertical plane. the spring has an undeformed length of 5 in. and a constant k =25 lb/ft. knowing that the collar is released from being held at a determine, the speed of the collar and the normal force between the collar and the rod as the collar passes through b.

What happens to an isotope during radioactive decay?