Recent content by james26

The friction is what is making the car accelerate to the left - it's the grip that the driving wheels have on the ground. There is no friction on the wheels of the caravan because the wheels are free to turn, though there will be a small amount of friction in the wheel bearings.

Jimmy, you are right, an equal force acts on both. Both the bullet and the gun will receive equal momentum (mv), so if you know the masses of each and the velocity after firing of one, you can work out the velocity of the other. You can then calculate the kinetic energy (mv^2)/2 of each. You...

Oh, yes, I did mean worse.. How do you know it will absorb most by radiation and lose most through convection? Also, how significant is the visible spectrum in terms of heat transfer? Is it as important as the IR region? And does the ability of a surface to absorb/emit in the visible...

Hi, could anyone tell me please, what would be the best colour to paint a boat to keep the cabin cool in a tropical climate? I think the answer probably is white because it will absorb less radiation, but I'm not sure because of course it will also emit radiation better as well. Any...