2. a water wave has a speed of 4 m/s and 10
waves go past each 30 seconds.
calculate the wavelength of the waves.

12.12 m

Explanation:

We have the following data:

is the speed of the water wave

is the frequency of the water wave

Now, the speed of a wave is given by the following equation:

Where is the wavelength.

Isolating :

Finally:

This is the water wave wavelength

when a device is used in a circuit in which the voltage is 81 v, the current flowing through the device is 3 a. what is the resistance of the device?

a. 27 ω

b. 40.5 a

c. 243 ω

d. 243 a

the correct answer is a. 27