I have a 9V Battery. I have two resistors; one at 10 ohms and one at 20 ohms. How do i calculate the total resistance of the circuit?

Aparticle travels in a circular orbit of radius 21 m. its speed is changing at a rate of 23.1 m/s2 at an instant when its speed is 37.2 m/s. what is the magnitude of the acceleration (in m/s? ) of the particle?

What causes the formation of ocean currents?

Which pair of quantities includes one quantity that increases as the other decreases during simple harmonic motion?