The main source of energy that powers the earth is the
a coat
b electrical
c moon
d sun

Your answer would be the sun :D

Explanation: If it wasn't for the sun the earth would just be a giant ball of ice and no would be able to live on earth

water at room temperature is flowing through a pipe with pressure taps located 10 ft apart along one section of the pipe, which are connected to a mercury (s=13.6) manometer.

a gas, having a molecular weight of 13 kg/kmol and a kinematic viscosity of 0.25 cm2/s, flows through a pipe 0.25 m internal diameter and 5 km long at the rate of 0.4 m3/s and is delivered at atmospheric pressure.