Which of the following represents a system that is completely open? A. a pot of boiling water B. a pressure cooker C. a capped soda bottle D. a pressurized canister of helium gas

The charge on an electron is 1.60218 × 10−19 c and its mass is 9.10939 × 10−31 kg. how strong a magnetic field must be experienced by the electron if its path is a circle of radius 5.5 cm? answer in units of t.

Aphoton is absorbed by an electron that is in the n = 3 state of a hydrogen atom, causing the hydrogen atom to become ionized. very far away from the nucleus, the released electron has a velocity of 750,000 m/s. what was the wavelength of the absorbed photon?

What is the momentum of a 47-gram tennis ball that is traveling at 40 m/s