Which of the following is an example of a scientific law? a) a prediction that increasing the volume of an object will increase its ability to float in water b) an explanation for why some electrons are affected when they are hit by photons and some electrons are not. c) experimental results that show that v = λf d) none of the above

An electron and a proton have the same kinetic energy upon entering a region of constant magnetic field and their velocity vectors are perpendicular to the magnetic field. suppose the magnetic field is strong enough to allow the particles to circle in the field. note: you'll need to look up the masses for an electron and proton. 1) what is the ratio of the radii of their circular paths rp/re?

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A100-watt light bulb illuminates a solar cell. the electricity from the solar cell operates a water pump that delivers 1 watt of power. what is the efficiency of the system?