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A molecule of DNA (deoxyribonucleic acid) is 2.23 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 1.19% upon becoming charged, and remains in this equilibrium position. Decide the effective spring constant of the molecule. Four Sig Figs
Starting from rest, a 91-kg fire fighter slides down a fire pole. The average frictional force averted on him by the pole has a magnitude of 750 N, and his speed at the bottom of the pole is 3.2 m/s. How far did he slide down the pole?
Two people stand 5.20 m apart and 4.00 m away from a large plane mirror in a dark room. At what angle of incidence should one of them shine a flashlight on the mirror so that the reflected beam straight strikes the other person.
The speed of a bobsled is increasing because it has an accelerationof 2.4m/s^2. At a given instant in time, the forces resistingthe motion, including kinetic friction and air resistance, total450 N. The mass of the bobsled and its riders is 270kg. Wh..
An unstable particle with a mass equal to 3.34 multiplied by 10-27 kg is initially at rest. The particle decays into two fragments that fly off with velocities of 0.981c and -0.864c, respectively. Find the masses of the fragments. (Hint: Conserve ..
An aircraft weighing 971 N is accelerated at 9.1 m/s/s for 5 seconds, at which time the aircraft launches. What is the force required to launch the aircraft
In the Bohr theory of the hydrogen atom, an electron moves in acircular orbit about a proton, where the radius of the orbit is.529X10^-10meters. (a), find the electric force between the two.(b) If this force causes the centripetal acceleration of the..
A satellite is in a circular orbit around the Earth at an altitude of 3.60 106 m. Find the acceleration of the satellite
The length of a beam increases by 1.26mm when its temperature is raised from 29.87oC to 71.49 oC. What is the length of the beam at the initial temperature
the drawing shows a type of flow meter that can be used to measure the speed of blood in situations when a blood vessel
What is the average pressure on the soles of the feet of a standing78.9-kg person due to the contact forcewith the floor? Each foot has a surface area of 0.022 m2.
In effect, the first circular dark fringe in the diffraction pattern defines the size of the central bright spot on the moon. find the diameter (not the radius) of the central bright spot on the moon.
express the potential difference between the plates.
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