An aluminium sphere 5 cm in diameter is suspended by a fine thread inside an evacuated jar, so that is can lose heat only by radiation. The sphere's initial temperature is 100°C
and the wall of the jar is always 22°C.
a) What is the initial net rate of heat loss of the sphere?
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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?