V = frequency * wavelength
v = 80 * 4
v = 320m/s
The battery provides electrical energy to run an electric circuit.
He doesn't lose weight he stays the same weight it's just gravity that changes
Answer:

Explanation:
Thrust is known as a reaction force which appears when a system expels or accelerates mass in one specific direction. If we know the acceleration and the mass of the air expelled by the jet engine, we can compute the thrust
.
The acceleration is calculated by using the dynamics formula

The values are


The thrust is

the answer is C. It allows citizens to submit anonymous tips to the police.