How did dalton improve the atomic theory more than 2000 years after democritus's hypothesis about atoms?

What is the difference between apparent magnitude and absolute magnitude?

What is the correct definition of mechanical energy?

Steel is made of atoms of iron and carbon. Would iron and carbon form metallic bonds? Explain your answer choice.

Two Earth satellites, A and B, each of mass m, are to be launched into circular orbits about Earth's center. Satellite A is to orbit at an altitude of 5580 km. Satellite B is to orbit at an altitude of 21000 km. The radius of Earth REis 6370 km.

Why do we increase potential difference along power lines

3. In a demonstration learning activity, A. the teacher shows children how something works or how to complete an entire activity. B. each child shows and tells about a favorite toy. C.

A 0.12 kg paper airplane flies in a straight line at a speed of 1.3 m/s. How much kinetic energy does the airplane have?

Each atom is composed of electrons and positive material. The mass of the atom is evenly spread throughout the atom. Neutrons are located in the center of the atom. Positive charge occupies a very small volume in the atom.

A hot-air balloon is ascending at the rate of 14 m/s and is 84 m above the ground when a package is dropped over the side. (a) How long does the package take to reach the ground? (b) With what speed does it hit the ground?

Now assume that the pitcher in Part D throws a 0.145-kgkg baseball parallel to the ground with a speed of 32 m/sm/s in the + x direction. The batter then hits the ball so it goes directly back to the pitcher along the same straight line.