1kg of ice at 0°c is heated at a constant rate and its
temperature is recorded after every 30 s till steam is
formed at 100°c. draw a temperature-time graph to
represent the change of phases.

Asun-sized star will spend most of its lifetime as a: white dwarf red giant protostar main-sequence star

The air that we breath is made mostly of which gaseous molecule

You have two photos of a person walking. one shows the person at the corner of third and main streets, the other shows the person at the corner of tenth and main streets. there are lampposts at every corner in this town, and the first picture shows it to be 10: 32: 00 exactly. the second picture shows it to be 10: 49: 30. you know three facts: (1) all of the clocks are synchronized; (2) there are exactly 12 equal-sized blocks per kilometer in this town; and (3) the streets that cross main in this area are numbered consecutively, with no interruptions. what is the person’s average speed in kilometers per hour?