Atoms with the same number of protons but different numbers of neutrons are

1) different elements

2) isotopes of the same element

3) isotopes of different elements

4) ions

The amount of work done depends on what two things

When the mover pushes the box, two equal forces result. explain why the box moves even though the forces are equal and opposite?

1. What type of evidence shows that, indeed, "there is more to perception than meets the senses?

Calculate how much work you need to move a 280 N shed to a platform 5 m above. A 2,800 J B. 1,400 J* C. 56 J

In what state must matter exist for fusion reactions to take place? ... ?

Water is poured into a container that has a leak. The mass 'm' of the water is given as a function of time 't' by, m=5t^0.8 - 3t + 20, with t>=0, mass in grams and t in seconds a. at what time is the water mass greatest, and b.

Determine the mechanical energy of this object: a 1-kg ball sits on a 10-meter high cliff. A. The ball isn't moving, so the mechanical energy is zero B. 10 J C. 98 J D.

A proton that has a mass m and is moving at + 164 m/s undergoes a head-on elastic collision with a stationary carbon nucleus of mass 12m. the velocity of the proton after the collision is answer

what is the mass number in atomic mass units of an atom with 14 protons, 14 electrons, and 16 neutrons

How much work does an elephant do while moving a circus wagon 20 meters with a pulling force of 200n