Awheel rotates with a constant angular acceleration of  rad/s2. during a certain time interval its angular displacement is  rad. at the end of the interval its angular velocity is 2 rad/s. its angular velocity at the beginning of the interval is:

The angular velocity at the beginning of the interval is .

Explanation:

Given that,

Angular acceleration

Angular displacement

Angular velocity

We need to calculate the angular velocity at the beginning

Using formula of angular velocity

Where, = angular acceleration

= angular velocity

Put the value into the formula

Hence, The angular velocity at the beginning of the interval is .

two charges are fixed in place on the x-axis as shown. the charge at x = 0 is negative and has magnitude q = 2 μcoulombs (1 μcoulomb = 10-6 coulombs). the charge at x = d, (d = +12 cm), is positive and has magnitude q = 4 μcoulombs. find a point x = xo along the x-axis at which the electric field is zero.

in this image, you can see solar radiation going through ocean water.

no image, but probably absorption