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

In order to be accepted, a scientific theory must be 1. widely tested and supported by extensive data 2. based on the results of a single experiment 3. controversial and cause debate 4. in line with all previous historical ideas

When Sr and F combine to form a compound, which atom (s) will become an anion?/ a Sr only b F only / c both Sr and F d neither Sr nor F

If you do not have oil in your car's engine, the parts that rub together in the engine get very hot. What does the oil do? A. It decreases the force of gravity. B. It increases the force of gravity. C. It decreases the force of friction. D.

When Maggie applies the brakes of her car, the car slows uniformly from 15.3 m/s to 0 m/s in 2.23 s. How far ahead of a stop sign must she apply her brakes in order to stop at the sign? Answer in units of m

A 3.00 kg box is lifted by an upward force 1.50 m above the surface pf Earth to the top of a table. What is the potential energy stored in the box at this new position?

What is the speed of sound in a vacuum?

An object has 60 j of potential energy and 40 j of kinetic energy. then 10 j of the potential energy is converted into kinetic energy. how much work was done on the object?

At what height above earth's surface is the gravitational acceleration reduced from its sea-level value by 0.40%?

A rocket moves away from the surface of the earth. As the distance r from the center of the planet increases, what happens to the force of gravity on the rocket?

Why am i not floating?