Un niño de 25Kg, está parado sobre una superficie horizontal sin rozamiento. A) ¿Qué fuerza neta experimenta el niño?
B) ¿Qué fuerzas actúan sobre el niño? Representa dichas fuerzas.

Explain in physical terms how a microwave oven works. what would happen when you put a conductor in the microwave oven? explain.

Modern physics a photon emitted from an excited hydrogen atom has an energy of 3.02 electron volts. which electron energy-level transition would produce this photon? a. n=1 to n=6 b. n=2 to n=6 c. n=6 to n=1 d. n=6 to n=2 i chose b but the correct answer is d can someone tell me why? and what's the difference?

An object weighs 40n in air, weighs 20n when submerged in water and 30n when submerged in a liquid of unknown density. what is the density of the liquid?