John took 45 minutes to bicycle to his grandmother's house, a total of 4 kilometers. what was his speed in km/hr? What are you solving for?
What’s the equation?
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Look at the potential energy diagram for a chemical reaction. which statement correctly describes the energy changes that occur in the forward reaction?

Wavelength,frequency,and energy are related.what happens to a wave as it’s wavelength gets shorter?

Unpolarized light of intensity i_0=750w/m^2 is incident upon two polarizers. after passing through both polarizers the intensity is i_2=280w/m^2. (a) what is the intensity of the light after it passes through the first polarizer in w/m^2? (b) write an equation for the angle between the polarizers in terms of the initial (i_0) and final (i_2) intensities. (c) find the angle between the polarizers in degrees.