The specific heat capacity of water is 4200 j/kg find the energy needed to heat

it means that it takes 4,200 joules of energy (that's the j) to raise the temperature of 1 kg of water (kg-1)

you need to stop taking that class

it was spontaneous.

"ain't i a woman? " is the name given to a speech, delivered extemporaneously, by sojourner truth, (1797–1883), born into slavery in new york state.sojourner truth' delivered her famous speech "ain't i a woman? " (which did not have a title at that moment) was given without any previous preparation. her dissertation took place at the women's convention in akron, ohio, in 1851.