If element X has 31 protons, how many electrons does it have?

What type of radiation is trapped on earth's surface by the greenhouse effect?

The two forces acting on a falling object are gravity and

The allowed energies of a simple atom are 0.0 ev, 5.5 ev and 9.0 ev. an electron traveling at a speed of 1.8*106 m/s collisionally excites the atom. part a what is the minimum speed the electron could have after the collision?

An electron is accelerated from rest by a potential difference of 350 V. It then enters a uniform magnetic field of magnitude 200 mT with its velocity perpendicular to the field.

What is the definition of ecosystem?

When is a body said to be at rest

27. Calculate the impulse when an average force of 10 N acts on a cart for 5.0 s.

A boy on a bicycle is resting at the top of a hill then he rides his bicycle down the hill describe how the boy potential and kineti energy differ at the top middle and bottom of the him

What is the displacement and distance if I walk 8 blocks north, 9 blocks west and 10 blocks south

What investigations provide large amounts of information about a wide range of variables.