how mass changes with speed

Q. How mass increases with speed ?

Q. How does the speed of sound change with change in amplitude of sound wave?

Q. How does the speed of sound change with change in wavelength of sound wave?

Q. How does mass change with increase in temperature?

Q. A man turns on rotating table with an angular speed $\omega$. He is holding two equal masses at arms length. Without moving his arms, he just drops the two masses. How will his angular speed change?