A 2.0 - m long string is tied to a 3.0 - kg rock and the rock is twirled around in a circle at a constant speed. The speed of the rock is such that the string makes an angle of 45 degrees with the horizontal . How long does it take the rock to complete one full circle ?

Unpolarized light falls on two polarizer sheets whose transmission axes are at right angles. a third polarizer is placed between the first two so that its axis makes a 52-degree angle with the axis of the first polarizer. a) what fraction of the incident light intensity is transmitted through the first polaroid? b) what fraction of the incident light intensity is transmitted through the second polaroid? c) what is the angle of polarization of the light that enters the third polaroid? d) what fraction of the incident light intensity is transmitted through the third polaroid. e) what happens if the middle polaroid is removed?

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Ways that industry and agriculture use physical properties to separate substances