1 1.3.2 Test (CST): Science and Engineering *A:
Question 5 of 25
Einstein's theory of general relativity is currently the best explanation of
gravity. Why has this theory not been replaced with a new one?
O A. It still explains the experimental evidence pertaining to gravity
B. Because of Einstein's fame, it remains popular among scientists
C. Scientists assume it is correct and therefore no longer perform
experiments on gravity
O D. The force of gravity has been shown to remain constant over time
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Explain the difference between each pair of concepts. a. frequency and relative frequency b. percentage and relative frequency a. select the correct choice below. a. frequency is the total number of observations in a data set. relative frequency is the number of times a particular distinct value occurs. b. frequency is the number of times a particular distinct value occurs. relative frequency is the ratio of the frequency of a value to the total number of observations. c. frequency is the total number of observations in a data set. relative frequency is the ratio of the number of times a particular distinct value occurs to the frequency. d. frequency is the number of times a particular distinct value occurs. relative frequency is the ratio of the frequency of two different values.

Consider a 1000 w iron whose base plate is made of 0.5 cm thick aluminum alloy 2024-t6 (ρ = 2770 kg/m3 and cp = 875 j/kg°c). the base plate has a surface area of 0.03 m2. initially, the iron is in thermal equilibrium with the ambient air at 22°c. assuming 90% of the heat generated in the resistance wires is transferred to the plate, determine the minimum time needed for the plate temperature to reach 200°c.

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