The speed of electromagnetic waves in a vacuum is the same as the speed of light. It can be measured by finding the frequency and wavelength of two different waves, and then by that correlation, the speed of the waveform.
Hope this helps you (:
The second circuit with 4.5 A current has more resistance.
Explanation:
potential difference= 6 V
resistance of first circuit=0.80 Ω
for second circuit, current= i=4.5 A
using Ohm's law V= i R
6=4.5 R
R=1.33 Ω
So the second circuit has a greater resistance.
You multiply the mass by the acceleration 82*7.5=615; that's what I would do
