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A molecule of DNA (deoxyribonucleic acid) is 2.21 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 0.95% upon becoming charged. Decide the effective spring constant of the molecule.
The electric potential in a certain area is given as: V = 3x^2 + 5yz. what is the electric field in the area
A ball is thrown directly up from the ground with speed vsub0. At the same time, a second ball is dropped from rest from a height H, straight above the point where the first ball was thrown upward. There is no air resistance. A) Find out the time at ..
The pilot of an airplane executes a loop-the-loop maneuver in a vertical circle. What is the pilot's apparent weight at the lowest point if his true weight is 160 lb
Water stands at a depth D=35.0m behind the vertical upstream face of dam of width W=314m. Discover (a) the net horizontal force on the dam from the measure pressure of the water and (b) the net torque due to that force about a horizontal line during ..
A mass of 12.5 kg is hanging by a steel wire 1.11 m long and 1.03 mm in diameter. If the mass is pulled down slightly and released, what will be the frequency of the resulting oscillations
sound is detected when a sound wave causes the eardrum to vibrate. typically the diameter of the eardrum is about 8.4
A 38.0 kg box initially at rest is pushed 4.00 m along a rough, horizontal floor with a constant applied horizontal force of 125 N. determine the final speed of the box
Bob takes off for a planet that is 100 LY away moving in a rocket ship at .9999c relative to Earth when he is 10 years old. How old is Bob (in years) when he arrives
Find the energy levels and the wave functions of the ground state and the first excited state for a system of two noninteracting fermions with with spin 1/2 moving in a one-dimentional infinite square well
A speeder is pulling directly away and increasing his distance from a police car that is moving at 21 m/s with respect to the ground. compute the speeder's speed with respect to the ground
A 17cm radius air duct is used to replenish the air of a room 7.1 m x 5.2 m x 4.5 m every 16 min. How fast does air flow in the duct
A 710 kg car stopped at an intersection is rear-ended by a 1800 kgtruck moving with a speed of 16 m/s. If the car was in neutral andits brakes were off, so that the collision is estimated elasticfind the final speed of the truck. Find the final sp..
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