The radius of Earth is about 6.38 ✕ 103 km. A 7.09 ✕ 103 N spacecraft travels away from Earth. What is the weight of the spacecraft at the following distances from Earth's surface? (a) 1.23 ✕ 10^4

If two students are running down the hall toward each other, trying to get to class, and they have the same mass and acceleration, what will happen when they collide? will their forces cancel out or will each one experience a reaction?

Ascientific blank must be testable and capable of being proven false?

Give one example to show that when substances are mixed,it may result in a chemical or a physical change depending on the conditions.