Read the false statement. in an atom, protons and electrons are in the nucleus, which is surrounded by neutrons. which option rewords the false statement so it is true?
1. in an atom, protons and neutrons are in the nucleus, which is surrounded by electrons.
2. in an atom, electrons and neutrons are in the nucleus, which is surrounded by protons.
3. in an atom, electrons and neutrons are in the nucleus, which is surrounded by photons.
4. in an atom, electrons and photons are in the nucleus, which is surrounded by neutrons.

The solar panels used by mark function because of the photoelectric effect. light shines on the cells causing electrons to be ejected from the metal, which produces an electric current. at night on mars, no light will fall on the solar cells and no electric current will be generated. according to your notes, what type of light is typically needed to cause the photoelectric effect? a)visible b)ultraviolet c)infrared

Consider a double atwood machine constructed as follows: a mass 4m is suspended from a string that passes over a massless pulley on frictionless bearings. the other end of this string supports a second similar pulley, over which passes a second string supporting a mass of 3m at one end and m at the other. using two suitable generalized coordinates, set up the lagrangian and use the lagrange equations to find the acceleration of the mass 4m when the system is released. explain why the top pulley rotates even though it carries equal weights on each side.

Astudent pushes a 60-n block across the floor for a distance of 10 m. how much work was done to move the block