Abat flying in a cave emits a sound and receives its echo 0.1 s later. how far away is the cave wall? assume the speed of sound to be 340 m/s. answer in units of m.

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?

What is the relationship between globular clusters and the milky way?

The current through a 10 ohm resistor is 1.2 amperes.what is the potential difference across the resistor?