A crowbar of length 1m is pivoted at 20cm away from the load of 400N calculate effort applied ,MA, VR ,efficiency ,show a diagram of lever

Why does the sun appear to be the brightest star in the sky? a- its apparent brightness is much greater than other stars. b- it burns more gas, making it brighter than any other star. c- it is the largest star in the galaxy, so it is the brightest star. d- its relative distance to earth is closer than the other stars.

An electron moved from shell n = 2 to shell n = 1. what most likely happened during the transition? a fraction of a photon was added. a photon of energy was absorbed. a fraction of a photon was removed. a photon of energy was released.

What mass of natural gas (ch4) must you burn to emit 276 kj of heat?