A 20 watt light bulb uses 20 joules of energy every second. A person expends 50 watts of energy per stair when climbing up stairs. Calculate how long you could light the light bulb if the energy used to climb 20 stairs were converted to electricity.

What would be the result of an alpha particle coming into a magnetic field? a) the alpha particle will stop moving. b) the alpha particle will reverse its direction. c) the alpha particle will be deflected in a curve path. d) the alpha particle will continue to travel in a straight line.

Specific heat refers to the amount of heat required to change 1 gram of a substance by degree(s) celsius

Global warming will produce rising sea levels partly due to melting ice caps but also due to the expansion of water as average ocean temperatures rise. to get some idea of the size of this effect, calculate the change in length (in m) of a column of water 1.45 km high for a temperature increase of 1.12°c. assume the column is not free to expand sideways. as a model of the ocean, that is a reasonable approximation, as only parts of the ocean very close to