A steel I-beam is 12.0 m long. It is supported at its center by a cable at a construction site is undergoing torsional oscillations. Two workers, each of mass 85 kg, jump on opposite ends of the beam. If the frequency of the oscillations decreases by 25%, what is the mass of the beam

Will give brainliest! which statement best describes the difference between strong nuclear forces and weak nuclear forces? weak nuclear forces are involved when certain types of atoms break down. strong nuclear forces are responsible for holding atoms' nucleus together. weak nuclear forces hold bonds between atoms together. strong nuclear forces hold together the nucleus of an atom. strong nuclear bonds prevent atoms from falling apart. weak nuclear bonds prevent compounds from falling apart. strong nuclear forces are involved in breaking electrons from their shells. weak nuclear forces hold protons in the nucleus.

What is the average speed of a car that travels 40 mph for 1 hour and 60 mph in another hour?

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