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A molecule of DNA (deoxyribonucleic acid) is 2.31 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 1.02% upon becoming charged, and remains in this equilibrium position. Determine the effective spring constant of the molecule.
a diving bell in the shape of a cylinder with height 2.5m is closed at upper end and open at the bottom. its lowered
A satellite is in a circular orbit around an unknown planet. The satellite has a speed of 1.13 x 104 m/s, and the radius of the orbit is 3.77 x 106 m. What is the orbital speed of the second satellite
A 200 kg rocket sled can be accelerated at a constant rate from rest to 1600 km/h in 2.0 s. What is the magnitude of the required net force
A small object carrying a charge of -6.00 nC is acted upon by a downward force of 19.0nN when placed at a certain point in an electric field. What would be the magnitude and direction of the force
A particle's position is described by the equation below. sketch the position as a function of time between 0 and 100 seconds. An online math program can be found at wolframalpha.com and can aid in plotting, math, etc. For example to plot x(t)=e^-t..
a train is traveling at 30.0 relative to the ground in still air. the frequency of the note emitted by the train
a test charge of 3.10 microc is placed 6.10 cm away from a large flat uniformly charged nonconducting surface. the
A charged particle is injected at 143 m/s into a 0.0855-T uniform magnetic magnetic field perpendicularly to the field. What is the charge-to-mass ratio of this particle
The critical angle for the total internal reflection at the liquid air interface is 42.5 degrees. (a) If a ray of light traveling in the liquid has an angle of incidence of 35.0 degrees at the interface, what angle does the refracted ray in the ai..
A 1600·kg car traveling with a velocity of 6·m/s north collides head-on with a 3200·kg truck traveling with a velocity of 4·m/s south. What impluse is delivered to the truck by the car
When a ceiling fan rotating with an angular speed of2.70 {\rm rad/s} is turned off, a frictional torque of0.140 {\rm N \cdot m} slows it to a stop in 25.5 {\rm s}. What is the moment of inertia of the fan
Please show steps: Hydraulic engineers in the United States often use, as a units of volume of water, What volume of water, in acre-feet, fell on the town
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