If a ship captain sounds a foghorn toward a huge object that in front of the ship and hears the echo 4.6 s later, how far away is the object ? (air temperature is 20 C) Think about this one . If you make a mistake, the ship could run into that huge object Someone help I really need help I hope someone answer

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?