Wind can move the blades of a windmill

When seen from below, the blades of a ceiling fan are seen to be revolving anticlockwise and their speed is decreasing.Select correct statement about the directions of its angular velocity and angular acceleration.

State the function of the gear bear bor in a wind mill?

Why do the blades of a pair of scissors have edges ?

A winding wire which is used to prepare a solenoid of length 80 cm can bear a maximum cuurent of 10 A. the cross-sectional radius of the solenoid is 3 cm. what should be the length of the winding wire if a magnetiic field of 0.2 T is to be produced at the centre of the solenoid along its axis?

What is the effect of wind on Doppler shift of sound waves? Does velocity of sound remain same in presence of wind?

Write whether following statements are true or false. If false correct and rewrite them: Leaves with undivided leaf blade and a single mid rib are called compound leaves .

A toroid with a circular cross-section has a current I in its winding. The total number of windings is N. The total current through an Amperian loop of radius r equal to the mean radius of the toroid is

Write whether the following statements are True or False : Bones can move in 360^@ angle in a hinge joint.

If friction is zero , can a vehicle move on the road ? Why are we not considering the friction in deriving the expression for the banking angle ?