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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 1.35 percent upon becoming charged, and remains in this equilibrium position. Obtain the effective spring constant of the molecule.
A cylinder with a piston contains 0.250 mol of ideal oxygen at a pressure of 2.25x105 Pa and a temperature of 355K. The gas first expands isobraically to three time sits original volume. It is then compressed isothermally back to its original volume,..
Two 500 g spheres with equal positive charges are suspended by 10.0 cm long strings in a uniform electric field E = 2.00 x 106 N/C, If the charged spheres are in equilibrium when their strings make angles of 20.0. with the vertical, determine the c..
How much time does the ball spend in the air. What is the longest "hole in one" that the golfer can make, if the ball does not roll when it hits green.
Consider a simple RC circuit (a power supply, capacitor andresistor) in series. If you add a parallel branch, to the R and C,that only contains another resistor, what happens to the time constant?
How might a magician make the Statue of Liberty disappear? Imagine that you are sitting with some spectators on a circular platform that, unknown to all of you, can rotate very slowly. It is evening, and you can see the Statue of Liberty a short dist..
A curve in a highway has radius of curvature 130 m and is banked at 3.5°. On a day when the road is icy, what is the safest speed to go around the curve
if the radius of a blood vessel is reduced by cholesterol deposits to 90 of its original value flow will decrease. by
You place 73 moles of hydrogen gas in a balloon of volume 2.6 m3, and find the pressure to be 1.4 times atmospheric pressure. What is the typical speed of a hydrogen molecule?
Breathing deep, your professor inhales air at 0.203 m/s. As the air goes through a constriction in his bronchus, it doubles in speed. How much does the air pressure drop in the constriction
Red blood cells have a particular gravity of 5.00 and a diameter of about 7.50 . If they are spherical in shape (which is not quite true), calculate what is the mass of such a cell
When you walk with a cup of coffee (diameter5 cm) at just the right pace of about1 step per second,What is the speed of the waves in the coffee
The pressure-volume graph shows an engine cycle where the working substance is an ideal monatomic gas (? = 5/3). The process A-B is adiabatic. calculate the heat removed from the gas
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