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A molecule of DNA (deoxyribonucleic acid) is 2.35 µm long. The ends of the molecule become singly ionized: negative on one end, positive on the other. The helical molecule acts like a spring and compresses 1.34% upon becoming charged. Determine the effective spring constant of the molecule.
The force component along the displacement varies with the magnitude of the displacement, as shown in the graph. Find the work done by the force in the interval from 0 to 0.1 m
John measured the thickness of a book using a ruler. Calculate the mean thickness of the book.
From colonial times through the 1960s, the primary mode of mental illness treatment was institutional. What factors were responsible for this shift
The maximum tension that a 0.5m string can tolerate is 14N. A 2.5kg ball is attracted to the string being whirled in a vertical circle. What is the maximum speed the ball can have at the top of the circle.
A real heat engine working between heat reservoirs at 970. K and 650. K produces 550. J of work per cycle for heat input of 2200. J. Calculate the total entropy change of the universe
A toy cork gun contains a spring whose spring constant is 10.02 N/m. The spring is compressed 5.0 cm and then used to propel a 6.00 g cork. The cork, however, sticks to the spring for 1 cm beyond its unstretched length before separation occurs. The m..
White light is the incident from air onto a transparent material at an angle of 40 degrees. What are the indices of refraction for the two colors
question1car a is moving with a constant speed of 10ms and passes car b which is at rest. ten second later the latter
The relationship between angular frequency and wavenumber for a deep water wave is: ?=gk????, what is the group velocity of the wave
One of the first signs of sunburn is the reddening of the skin (called erythema). How many photons are incident on the skin in this amount of exposure
A bowling ball encounters a 0.76 m vertical rise on the way back to the ball rack, as the drawing illustrates. find the translational speed at the top
The graph of two cars that collide shows that they intersect at a point 5.5m on a distance/time graph. The first car has a velocity of 0.39m/s. How do the two sets of values compare
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