Ahydrogen atom has a diameter of about 10nm
(a) express this diameter in meter
(b) express this diameter in millimeter
(c) express this diameter in micrometer
show working if you can.
i'm in high school, i don't know why it says i'm a middle schooler.

Determine the maximum r-value of the polar equation r =3+3 cos 0

2kg of refrigerant 134a undergoes a polytropic process in a piston-cylinder assembly from an initial state of saturated vapor at 2 bar to a final state of 12 bar, 80 degree c. a)determine the work for the process in kj. b)sketch the process on a p-v diagram.

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?