Prove that, something to the power zero is one.
Answer:-
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Solar constant.
Answer:- It is the amount of heat energy (radiation) absorbed per minute by the sq. cm of a perfectly black body surface placed at a mean distance of the earth from the sun, in the absence of the atmosphere, the surface being held perpendicular to the sun's rays.
What is degree of freedom ?
Answer:- Degree of freedom, of a mechanical system, is defined as the no. of possible independent ways in which the position and configuration of the system may change.
Explain Recoil of a gun 🔫 ?
Explanation:- When a bullet is fired from a gun, the gun recoils back.The reason is that the gun exerts an action force on bullet in forward direction,the bullet also exerts an equal and opposite reaction force as gun.As a result the gun recoils in backward direction.The gun-man feels a backward jerk.
What is centripetal force ?
Answer:- Centripetal force is that external force which deflects a particle from its linear path to make it moves along a circle and is always directed radially inwards.
Why a cricket player moves his hands backward while catching a ball 🏀?
Answer:- Initially the ball is moving with a certain velocity and the player has to apply a retarding force to bring the ball to rest in his hand.In this case ∆t→0 so a large force exerted by the ball upon the hands of player.But if he moves his hands backward then he provide a greater time for change in momentum.Thus a small force is exerted by the ball upon the hands.
What is impulse ?
Answer:- The impulse of a force may be defined as the product of the average force and the duration of impact. I.e Impulse (I)=average force × time I=Fdt or I=dp dp=change in momentum