If element X has 39 protons, how many electrons does it have?

D=25 meters T = 100 seconds V=

Which example best represents translational kinetic energy? a plucked string on a guitar the moving blades of a ceiling fan a spinning top a tuning fork struck on a rubber block an apple falling from a tree

If an earthquake occurred and there was serious damage, its strength can be measured anywhere from on the Richter scale.

A crow who wants to eat a snail will drop it from a high place to crack the snail's shell and expose the tasty flesh. In order to crack the snail's shell, it must be going 15 m/s when it hits the ground. Assume that the snail free falls.

If this 1300 kg car is driven at 27 m/s through the bottom of a circular dip in the road that has a radius of 600 m, by how much do these springs compress compared to when the car is driven on a flat road

As the average kinetic energy of the particles in a gas increases, which of the following occurs?

Power=170 watts time=20 seconds

What is the charge of alpha, beta and gamma rays?

A pair of scissors is a complex machine. what simple machines make up a pair of scissors?

Methane gas absorbs red light, and methane clouds reflect blue light, giving Uranus and Neptune their distinctive blue colors. Why do Uranus and Neptune have methane clouds, but Jupiter and Saturn do not