[انا العمري]

بسم الله الرحمن الرحيم ..
اتمنى احد يساعدني في حل الاسئله ..^^

True or false and correct:
1 – The necessary condition for simple harmonic motion in simple pendulum if F = k x, where ( k is the restoring force and x is the displacement).
2 – In the capillary rise, the water rises in the tube because F.cos(θ) is minimum.
3 – The surface tension (γ) is defined as is the work done per unit volume of the liquid surface to increase this area.
4 – The acceleration due to gravity is g = 4 π(L/T2) with the unit of cm/sec2.
5 – The force constant of the spring is k = 4 π2 / (m/T2) gm /sec2.
6 – A block on the end of a spring is pulled to position x = A and released. In one and half cycle of its motion, the total distance dose it travels equal 3A.
7 – The power of lens Defined as: it is the object distance of a point on the lens axis whose image is at infinity.
8 – The contact angle (θ) define as the angle between the surface liquid and the surface of liquid and the surface of solid and its magnitude is the same to any liquid.
Define the following:
The surface tension – Power of lens – The focal lens – period time – restoring force