The temperature coefficient of resistivity of iron is 5.0 x 10–3/ºC; that of carbon is –0.50 x 10–3/ºC. When an iron wire and a carbon rod, each having the same 10 Ω resistance at 20ºC, are cooled from that temperature to –80ºC, the new ratio of the resistance of the carbon rod to the resistance of the iron wire at the lower temperature is Group of answer choices +1.9 –10 +2.1 –0.10 +10

7. see worksheet 1 for values of variables x1, x2 and x3 and answer the following questions: a. for each variable find the mean, median, coefficient of skewness, range and population standard deviation. b. compared to variable x1, how are the mean and median affected by extreme values (outliers) seen in x2 and x3. c. is the median or mean the better measure of location for x2 and x3? explain. d. explain the differences in the magnitudes of the skewness coefficients for the three variables. e. what is the relationship between the range and standard deviation looking across the three variables?

Determine the force the sun exerts on an object with a mass of 80.0 kg if that object is on the earth. what is the force exerted by the moon on the same object? what is the force the earth exerts on it?

The amount of potential energy possessed by an elevated object is equal to