The two waves in the diagram are occupying the same place at the same time. at what time will the interfering waves have an amplitude of zero?

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The boy of mass 30 kg is at r1= 2 meters from the fulcrum. of the girl is 45 kg, at what r2 must she sit so that they are balanced ?

Imagine you are standing in the antarctic during the southern hemisphere summer. the sky is clear and blue. there are no clouds in the sky. your shadow is cast on the icy ground. what is the color of the shadow?

What is the force that opposes motion and works against the downward pull? a) friction b) gravity c) weight d) acceleration