Which type of wave requires a material medium
through which to travel?
(1) sound (3) television
(2) radio (4) x ray

1. a net force of 100 newton’s is applied to a wagon for 5 seconds. this causes the wagon to undergo a change in momentum of

1. jay fills a wagon with sand (about 20 kg) and pulls it with a rope 30 m along the beach. he holds the rope 25° above the horizontal. the rope exerts a 20-n tension force on the wagon. how much work does the rope do on the wagon?

The discovery of the electron as a subatomic particle was a result of