Farmers fill their crop fields with water to protect from frost: why?
Water has high specific heat capacity so it delays the surrounding temperature to fall to zero degree Celsius ,thus protecting the crops from frost
Which is always constant for a machine of given design: MA or VR ? Ans: VR remains constant for a machine of given design as it depends on the distances moved by the load and effort but MA can vary due to the friction developed between the moving parts of the machine.
Comments
Post a Comment