Achild is sending pulses down a stretched rope at a rate of 2 pulses per second. the distance between the pulses is 5 meters. what is the speed of the wave?

Erosion of the beach is normally a slow process. however, in certain situations, large chunks of shore may wash out to sea. what could cause this to happen?

Atomic nuclei of almost all elements consist of

The star betelgeuse is about 600 light-years away. if it explodes tonight, a. we'll know because debris from the explosion will rain down on us from space. b. we'll know it immediately because it will be brighter than the full moon in the sky. c. we won't know about it until 600 years from now. d. none of the above.