A rope of length with a mass of 4kg attached to it's end is making 360rev/min, if the tension on the rope is 4000N find the length of the Rope​

The sun generates both mechanical and electromagnetic waves. which statement about those wave is true?

The coefficient of friction is a number that represents the resistance to sliding between two in contact with one another.

Two conductors, a and b, are each in the shape of a tetrahedron. but of different sizes. they are charged in the following manner: 1. tetrahedron a is charged from an electrostatic generator to charge q. 2. tetrahedron a is briefly touched to tetrahedron b. 3. steps 1 and 2 are repeated until the charge on tetrahedron b reaches a maximum value. if the charge on tetrahedron b was q/4 after the first time it touched tetrahedron a. what is the final charge qbmax on tetrahedron b?