A0.25-kg ball attached to a string is rotating in a horizontal circle of radius 0.5m. assume the tension force is directed horizontally.
if the ball revolves twice every second, what is the tension in the string?

T= 19.74 N

Explanation:

The tension in the string will be equal to centripetal force on the ball. (Newton's 3rd law, equal acting and reacting forces acts on a body)

T = Fc

Fc = m w ²r

here:

m = 0.25 kg, r = 0.5 m

w = 2 rps = 2 * 2π rad/s      ( ∴ 1 revolution = 2π radians )

w = 4π rad/s

Fc = m w ²r = 0.25 * ( 4π )² * 0.5 N

Fc = T = 19.74 N

T= 19.74 N

current and voltage can both be different in different parts of a circuit so it matters where you place the ammeter and voltmete

answer: the metamorphic rocks are formed when they are exposed to high pressure and high temperatures. this happens when one of the earth's plates comes in contact with the other plate by traveling in opposite directions, straight into each other or slipping under one another. the friction that is caused by this activity results in   melting of rocks and when it cools they are known as metamorphic rocks. this process needs a controlled amount of pressure and temperature otherwise it may turn into magma.