A sample of helium occupies 44.8 L at STP. What is the mass of the sample?
A. 2.00 g
B. 4.00 g
C. 8.00 g
D. 16.0 g
C. 8.00 g
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The room-temperature yield strength of very-low-carbon steel as a function of the square root of the interstitial solid-solution carbon concentration is shown in Figure 7.12.
(a) Evaluate all of the constants in the equation for the tensile yield strength as a function of solid-solution chemical composition. (b) The maximum equilibrium composition of interstitial carbon possible in ferritic iron is 0.0011 atom fraction (af). If an iron-carbon alloy of this composition could be produced at room temperature, what should the yield strength be? You must solve this problem analytically; you can check your result graphically. (c) If the composition of 0.0011 af of carbon is exceeded, the extra carbon forms iron carbide. If a specimen is produced with 0.0015 af of carbon, do you expect the strength to be given by an extension of the line in the figure? Briefly explain your answer.
Length Contraction: Observer A sees a ruler moving by in a relativistic rocket and measures its length to be LA. Observer B moves along with the rocket and measures the length of the ruler to be LB. What is true about these two length measurements?
A. LA > LB B. LA = LB C. LA < LB D. LA could be greater or smaller than LB depending on the direction of the motion.
In Copernicus' model of the solar system, the planets orbited the ________ in ________ orbits.
A. Sun; circular B. Earth; circular C. Earth; elliptical D. Sun; elliptical
If two objects are electrically attracted to each other,
A) both objects must be negatively charged. B) both objects must be positively charged. C) one object must be negatively charged and the other object must be positively charged. D) one of the objects could be electrically neutral. E) None of the above statements are absolutely true.