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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Consider a resistor with color code “orange blue brown gold” and a measured value of 370 ω. determine the following: nominal value, tolerance, % error, and the probability of another resistor from the same manufacturing batch having a value closer to nominal than this one. use matlab or excel to evaluate the erf function.

If the chemical properties of a substance remain unchanged and appearance or shape of a substance changes it is called a ?

The electric potential a distance r from a small charge is proportional to what power of the distance from the charge? a. r^-1 b. r c. r^-2 d. r^2