15. If the frequency of a sound wave in air at STP remains constant, the wave's energy can be
varied by changing its
(1) amplitude
(3) wavelength
(2) speed
(4) period

Aseries circuit consists of a resistor with r = 20 ? , a capacitor with c = 0.01 f, and a decaying battery with e = 300e? 5t. if the initial charge is 0, find the charge as a function of time t

Inside of a windmill or a dam is a that is used to transform one type of energy into electrical energy. a. motor b. generator c. transformer d. power pack

Amira pulls a 3 pound wagon 4 feet. how much work has she done?