A child drops a ball from a window. The ball strikes the ground in 3 seconds. What is the velocity of the ball the instant before it hits the ground?

Astronomers discover an exoplanet (a planet of a star other than the sun) that has an orbital period of 3.87 earth years in its circular orbit around its sun, which is a star with a measured mass of 3.59 x 1030 kg. find the radius of the exoplanet's orbit.

The pressure proportional to the area a- inversely b- directly c- increase d-decrease

What can you increase the strength of an electromagnet by