What is the mass number of an atom with 5 protons and 7 neutrons

A hydrogen electron returns from energy level n = 3 to n = 1 during electron transition. What will the spectral lines emitted by this electron look like under a spectroscope? dark line spectrum white light continuous spectrum bright line spectrum

Does radiation need a phase of matter to travel with?

In hooke's law is force directly proportional to extension?

How much heat is required to warm 1.70 kg of sand from 28.0 ∘c to 100.0 ∘c?

Blocks A (mass 4.00 kg) and B (mass 6.00 kg) move on a frictionless, horizontal surface. Initially, block B is at rest and block A is moving toward it at 5.00 m/s. The blocks are equipped with ideal spring bumpers.

A box with a mass of 100.0 kg slides down a ramp with a 50 degree angle. What is the weight of the box? N What is the value of the normal force? Round the answer to the nearest whole number.

How does thermal energy heat a house? What devices and systems are involved?

A skater with an initial speed of 7.68 m/s stops propelling himself and begins to coast across the ice, eventually coming to rest. Air resistance is negligible. (a) The coefficient of kinetic friction between the ice and the skate blades is 0.105.

A. A PH202 student lives next to a construction site and sees a crane with a wrecking ball demolish the building next door. The wrecking ball swings along the wall between her house and the neighbor's house.

Sometimes when you are training for event you may notice a decrease in improvement in level out of performance true or false