What gives an airplane a forward force?

a. the drag caused by air resistance

b. the spinning of its propellers

c. the pull of Earth’s gravity

d. difference in pressure above and below the wings

What is hidden during a lunar eclipse? isn't the moon hidden?

Ascrew incorporates which other simple machine? lever wheel and axle inclined plane pulley

In all trials, the magnitude of the final velocity for g1 + g2 was less than the magnitude of any initial velocity. as mass increased, what happened to the velocity? the velocity decreased. the velocity increased. the velocity of g1 + g2 could not be measured. the velocity was not affected by the mass increase.