Which statement is true about the loudness of sound? . a. it is directly proportional to the distance of the listener from the source.. b. it is inversely proportional to the square of the distance of the listener from the source.. c. it is directly proportional to the square of the distance between the listener from the source.. d. it is inversely proportional to the distance between the listener from the source.

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?

Asolid cylinder and a cylindrical shell have the same mass, same radius, and turn on frictionless, horizontal axles. the cylindrical shell has light-weight spokes connecting the shell to the axle. a rope is wrapped around each cylinder and tied to blocks of equal masses that are held the same height above the ground. both blocks are released simultaneously. the ropes do not slip. which block hits the ground first? or is it a tie?

If anyone who can me with this hw? i would really appreciate it