What is the total mechanical energy of a penny dropped off of the top of the Empire State Building if it has a potential energy of 47 J, and a kinetic energy of 23 J? 18 J
24 J
70 J
667 J

as technology advances, new experiments often expose problems in accepted theories. c

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the temperature in kelvin of 2.0 dm3 of an ideal gas is doubled and its pressure is increased by a factor of four. what is the final volume of the gas

the aurora is formed when charged particles emitted from the sun during a solar flare penetrate the earth's magnetic shield and collide with atoms and molecules in our atmosphere. these collisions result in countless little bursts of light, called photons, which make up the aurora.

auroras are generated by charged solar particles hitting molecules in earth's atmosphere. this usually happens in high latitudes, because our planet’s magnetic field tends to funnel these particles toward the poles. that’s why it can be experienced in northern ohio.