Question

8. A Turbine cannot be rotated by
a) flowing water
b) heat of sun
c) steam
d) moving wind​

Answer 1

Answer:

heat of sun the turbine does not rotate

Answer 2

A turbine cannot be rotated by the heat of the sun (option b).

• To move the turbine, force is necessary.

• The kinetic energy of flowing water converts to provide the turbine blades with energy to rotate. The collision of the water molecules on the surface of the blade causes this energy transfer.

• In steam turbines, the immense amount of hot steam creates dynamic pressure on the turbine blades forcing them to rotate.
• In wind turbines, the force of the wind molecules hitting the blade surface causes the turbine to rotate.
• However, the heat from the sun does not provide direct contact of any molecules with the turbine blade surface. Hence, no force is applied to the blades, no energy transfer takes place and no pressure is applied on the blades so they stay still.