Earth's core is composed primarily of -iron oxides and magnesium -silicon and iron -iron and nickel -magnesium and nickel

Starting with only the balmer series light (visible light), how could we ensure that the solar panels generate a current that mark can use for his power station? a)by gradually increasing the brightness (amount) of light that we shine on it. b)by gradually increasing the frequency of the light we shine on it. c)by gradually increasing the wavelength of the light that we shine on it.

What is the primary force that suspension bridges use cables to hold their spans up? a. tension force b. resistance force c. normal force d. elastic force e. applied force

How much energy must a refrigerator absorb from 225 g of water so that the temperature of the water will drop from 35°c to 5°c