Hey I need help with the question below: Guy runs 100 m in 11.85 s, Jeanne runs 200 m in 24.12 s and Terry runs 300 m in 39.18 s. Calculate the average speed vector of the trio. Compare it with the average speed vector of each. The three run in a straight line.

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Acertain radio station broadcasts radio waves that have a wavelength of 298cm what is its broadcast frequency?

Select all the correct answers. which changes will increase the rate of reaction during combustion? decreasing the area of contact between the reactants adding more oxygen to the reaction removing heat from the reaction changing the reactants from solid form to powdered form lowering the exposure of the reactants to air

What is the difference between mass density and weight density?