When a 1 kg mass is hung on a vertical spring, it extends the spring by 0.50 m. What is the magnitude of the force on the mass due to the spring

For the car in the picture ,in which direction is the normal force? -into the screen -down -out of the screen -up

Hydrogen atoms are excited by a laser to the =4n=4 state and then allowed to emit. what is the maximum number of distinct emission spectral lines (lines of different wavelengths) that can be observed from this system? 8 6 2 7 4 5 1 3 calculate the wavelength of the 4⟶14⟶1 transition. =λ=

Which are true about beta reactions? there will be more than one answer. a. it has no change b. it doesn't change the mass of the number c. it has a mass of 0.0005 atoms d. it causes transmutation.