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Which renewable energy methods are the best?

This depends on what "best" means, but generally this boils down to location. As an example, consider geothermal energy. This is derived from heat sources inside the Earth. Some places, such as Ice...
CW
Answered by Callum W. • Physics tutor
2247 Views

If Newton's third law is correct, why are walls not indestructible? In applying a force to a wall, if it breaks surely it is not giving an equal and opposite force.

It is best to consider this in slow motion. First we have a wall which is at equilibrium (no external forces/all forces are balanced). Someone decides that the wall is in its way and wants to break down the ...
CW
Answered by Callum W. • Physics tutor
5232 Views

Write down the equation which links speed, distance and time

speed = distance/time
SM
Answered by Sean M. • Physics tutor
4160 Views

What's the difference between weight and mass and how do I find one from the other?

This is often confusing because in everyday life people might say "how much do you weigh?" to which you might say "60kg", 60 kg is actually your mass and when we talk about weight in this...
JB
Answered by Jack B. • Physics tutor
5248 Views

A 6.0W bulb is connected to a source of 480J of energy. Assuming the system is 100% efficient, and the bulb runs at full power, how long can it stay lit?

Bulb power = 6.0W - Energy provided = 480J - Use equation P = E / t (Power = energy/time) where power is in watts, energy is in joules, and time is in seconds - Rearrange the equation to give t = E / P (time...
LW
Answered by Lily W. • Physics tutor
4111 Views