If a transformer has 5000 turns on the primary circuit, 3000 turns on the secondary and the primary circuit voltage is 120 volts, what is
the secondary circuit voltage (in volts)?

A)144
B)200
C)72
D)400

Awater balloon launcher uses an elastic band with a spring constant of 115 n/m to use thee launcher you stretch thee band back with a balloon n it the water balloons have a mass of 1.3 kg a) if you stretch the band by 0.8 m, what elastic force will the band exert? b) with the band stretched 0.8 m, how much elastic potential energy is stored in the spring? c) if you release the band, it pushes forward. what is the kinetic energy of the balloon when it reaches the natural length of the band? d) what is the speed of the balloon when it reaches the natural length of the band?

What happens when a rubber rod is rubbed with a piece of fur?

Coal contains energy. a. light b. kinetic c. chemical d. mechanical