8.14 following are tabulated data that were gathered from a series of charpy impact tests on a tempered 4140 steel alloy. temperature (°c) impact energy (j) 100 89.3 75 88.6 50 87.6 25 85.4 0 82.9 −25 78.9 −50 73.1 −65 66.0 −75 59.3 −85 47.9 −100 34.3 −125 29.3 −150 27.1 −175 25.0 (a) plot the data as impact energy versus temperature.

In 1995 a research group led by eric cornell and carl wiemann at the university of colorado successfully cooled rubidium atoms to the 20-200 nk temperature range. assuming (incorrectly) that the rubidium atoms behave liké particles of a classical ideal gas, calculate the rms speed of a rubidium atom at a temperature of 112.0 nk. in the experiments one particular isotope of rubidium was used, rubidium-87. the molar mass of this isotope is 86.91 q/mol. tries 0/20 submit answer

Awave travels at a speed of 5.2 m/s. if the distance between crests is 0.40 m, what is the frequency of the wave? use f=v/wavelength a. 13 hz b. 2.1 hz c. 0.077 hz d. 5.6 hz

Acar traveling at 22 m/s starts to decelerate steadily. it comes to a complete stop in 15 seconds. what is it’s acceleration?