Two earthquake waves of the same frequency travel through the same portion of the Earth, but one is carrying 7.0 times the energy. What is the ratio of the amplitudes of the two waves?

To create electromagnetic induction, which of the following has to move? a. a wire b. a magnet c. a transformer d. either a or b

Atomic nuclei of almost all elements consist 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?