Nx-ray studies of crystalline peptides, linus pauling and robert corey found that the c—n bond in the peptide link is intermediate in length (1.32 å) between a typical c—n single bond (1.49 å) and a c=n double bond (1.27 å). they also found that the peptide bond is planar (all four atoms attached to the c—n group are located in the same plane) and that the two α-carbon atoms attached to the c—n are always trans to each other (on opposite sides of the peptide bond). (a) what does the length of the c—n bond in the peptide linkage indicate about its strength and its bond order (i. e., whether it is single, double, or triple)? (b) what do the observations of pauling and corey tell us about the ease of rotation about the c—n peptide bond?
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Physics, 21.06.2019 17:00
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Physics, 21.06.2019 17:30
Abatter hits the baseball a with an initial velocity of v0 = 110 ft/sec directly toward fielder b at an angle of 23° to the horizontal; the initial position of the ball is 2.2 ft above ground level. fielder b requires 0.44 sec to judge where the ball should be caught and begins moving to that position with constant speed. because of great experience, fielder b chooses his running speed so that he arrives at the “catch position” simultaneously with the baseball. the catch position is the field location at which the ball altitude is 8.4 ft. determine the velocity of the ball relative to the fielder at the instant the catch is made.
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Physics, 23.06.2019 02:00
Estimate the kinetic energy of mars with respect to the sun as the sum of two terms, that due to its daily rotation about its axis, and that due to its yearly revolution about the sun. (assume mars is a uniform sphere with mass = 6.4×10 to the power of 23 kg, radius = 3.4×10 to the power of 6 m, rotation period = 24.7 hours, orbital period = 686 days and is 2.3×10 to the power of 8 km from the sun.)
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Nx-ray studies of crystalline peptides, linus pauling and robert corey found that the c—n bond in th...
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