Abattery has an emf of 15.0 v. the terminal voltage of the battery is 12.2 v when it is delivering 14.0 w of power to an external load resistor r. (a) what is the value of r?
(b) what is the internal resistance of the battery?

The value of R and the internal resistance of the battery are 10.6 ohm and 2.45 ohm

Explanation:

Given that,

Emf of battery = 15.0 V

Voltage = 12.2 V

Power = 14.0 W

(a). We need to calculate the value of R

Using formula of power

Where, R = resistance

P = power

V = voltage

Put the value into the formula

(b). We need to calculate the internal resistance of the battery

Firstly we calculate the current

Using formula of current

Put the value of P and V into the formula

We calculate the internal resistance

Using formula of emf

Put the value into the formula

Hence, The value of R and the internal resistance of the battery are 10.6 ohm and 2.45 ohm

be subject to a force andchange its motion

what is the speed of a softball that travels 20m in 2secs

speed = 20/2 = 10 m/s