Which part of the atom allows one atom to react with another one

A man weighs 645 N on Earth. What is his mass?

A spaceship takes off vertically from rest with an acceleration of 30.0 m/s 2. What magnitude of force F is exerted on a 53.0 kg astronaut during takeoff?

The helium used to fill birthday balloons doesn't come out of the air, but from out of the ground. Some of the gas might escape from the ground into the atmosphere, but the majority of it is trapped in Earth's crust.

The device is a burner from an electric stove. It is used to transfer heat to a pot by A. Conduction B. Convection C. Radiation D. Friction

A 1000-kg car is traveling north at 20.0 m/s. A 1500-kg car is traveling north at 36.0 m/s. The 1500-kg collides with the rear of the 1000 - kg car and they lock together.

Which explains how winds move?

Why is it important to develop alternative energy sources

Which of the following subatomic particles does not have a charge? A.) electron B.) proton C.) neutron D.) positron

How do we use light in space?

What units are used for gravitational potential energy? Write the name, not the symbol.