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A molecule of DNA is 2.17 micrometers (10^-6 meters)long. The ends of the molecule become singly ionized -negative on one end, positive on the other. The helicalmolecule acts like a spring and compresses 1.00% upon becomingcharged. Determine the effective spring constant.
An airplane propeller is 2.08 m in length (from tip to tip)with mass 117 kg. The propeller is rotating at 2400 rev/min aboutan axis through its center. What is its rotational kinetic energy
A simple pendulum makes 143 complete oscillations in 2.80 min at a location where g = 9.80 m/s2. Find the period of the pendulum
An arrow is shot vertically upward and then 1.84s later passes the top of a tree 40.9m high. How much longer will the arrow travel upward, and how high will it go
A carnot engine operates between a hot reservoir at 47C and a cold one at -13C. If the engine absorbs 500J as heat per cycle at the hot reservoir, how much work per cycle does it deliver
An ambulance with its siren at frequency 700 Hz is racing down the highway at 50m/s, What is the wavelength of sound in front of the ambulance
A boat clashed on something and fell to the ocean floor, a few years later a few researchers sent a robot and found out that the pressure at the same level as the boat was 413 atm. The density of the seawater was 1025 kg/m cubed. what is the depht of..
A major leaguer hits a baseball so that it leaves the bat at a speed of 32.0 and at an angle of 36.9 above the horizontal. You can ignore air resistance. What is the direction of the baseball's velocity when it returns to the level at which it left..
To monitor the breathing of a hospital patient, a thin belt is girded around the patient's chest, Find the average induced emf in the coil during this time. Assume the magnitude of the Earth's magnetic field is 26.9
An Earth satellite's elliptical orbit ranges from 300km to 840km altitude. At the high point, it's moving at 7.29km/s. How fast is it moving at the low point
A proton moves through a magnetic field at 25.9% of the speed of light. what is the magnitude of the magnetic force acting on the proton
A hiker moves from base camp a distance of 1250 m due East, then another 845 m in a direction 60.0 degrees North of East. What is the final displacement and direction from base camp
A rabbit runs in a straight line with a velocity of +1.40 m/s for a period of time, rests for 12 s, and then runs again along the same line at +0.63 m/s for an unknown amount of time.
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