Liquid nitrogen which normally has a boiling point of 77K is commonly used to cool substances to low temperatures. How much energy must be removed from 1.0 KG of gaseous nitrogen at 77K for it to completely liquefy?

Jason is a body builder. despite being more fit, he weighs more than his brother ryan, who is the same height. which is a possible reason? a. jason has more muscle mass than ryan does. b. jason has more body fat than ryan does. c. jason has more muscle mass and body fat than ryan does d. jason has less body fat than ryan does.

Considering only the earth's rotation, determine how much later the asteroid would have had to arrive to put the explosion above helsinki at longitude 25˚ e? this would have obliterated the city.

Glass has a hardness that is in the middle of the hardness scale. what is the hardness of glass?