Recent content by quantum mechanic

This statement is only valid if the Earth is a uniform shape, such as a perfect sphere. Earth is actually an oblate spheroid with the equatorial radius approximately 6378.5 km and the polar radius approximately 6356.9 km and its shape is not uniform. Without an even distrubtion of mass...

Expanding Universe When you say the universe is expanding, be sure to recognize that the universe refers to what we are able to "see" and/or "measure" (whatever the method).

A photon is considered to have an actual mass of zero and a zero rest mass, but when the photon is moving, it assumes an apparent mass due to the velocity (m = E /C2). This apparent mass is significant enough to lend to uncertainties in momentum and position according to Heisenberg.

Holly, You are correct in that the strength of the magnetic field produced by the pieces of the original magnet is proportional to the change in size of each piece; therefore, a magnet broken in half would produce two magnets equal to half the magnitude of the original magnet, and each...

If you lift a ball to some heigth h, you obtain a potential energy due to gravity that is equal to mgh. When the ball drops, the energy is gradually converted to KE, not all at once. To emphasize this point, imagine dropping the ball from heigth h. A friend catches the ball at height h/2...

I would have to agree with Integral in that there is no specific and unique term associated with work due to accelerated motion. The only exception that may be argued is the work done due to rotational motion. An object moving in a circle at a constant speed is by definition accelerating due...

Cookies sound good. Got milk?

Assuming planet Zeno is not in some alternate universe where our traditional laws of physics do not apply, then h(t) = y = h(t) = 45t - 9t2 should indicate an initial velocity of 45 m/s and an acceleration of -18 m/s2 (where negative is downward). y = v_0 t + \frac{1}{2}at^2 In the given...

If the string of the stone is wrapped around a gear of a much larger radius than the axle of the car, then more revolutions of the smaller axle would occur for each one revolution of the larger gear. Basically, the stone would not have to fall as far or need as much potential energy. I have seen...

A jump implies the application of a force to the ground or in this case the plane other than the force due to gravity. Newton's 3rd law explains why a person is able to leave the floor by jumping: The interaction of the pushing of the leg against the floor of the plane. A lift implies...

If the people suddenly lift (not jump) then a force would not be exerted, but the force with which they lift must be greater than the pull of gravity