Who was the first to hypothesize that electron orbit a positively charged nucleus

Recombination of white light can be done through glass slab

True or false static is weightless colorless and odorless

A car goes around a curve of radius r at a constant speed v. then it goes around the same curve at half of the original speed. what is the centripetal force on the car as it goes around the curve for the second time, compared to the first time?

A push on a textbook with 10 N moves it to a distance of 2 cm. How much force is need to move it to 4 cm?

If the frequency of a sound decreases, what happens to the wavelength

Compare and contrast the terms melting and freezing

A medical cyclotron used in the production of medical isotopes accelerates protons to 6.5 MeV. The magnetic field in the cyclotron is 1.9 T.

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%?