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A molecule of DNA (deoxyribonucleic acid) is 2.22 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 0.81 percent upon becoming charged, and remains in this equilibrium position. Find the effective spring constant of the molecule.
A system consists of two positive point charges, q1 and q2>q1. The total charge of the system is +62.0 x 10^-6 C, Find q1 and q2
What does the ammeter read? What does the voltmeter read?
A solenoid 2.9 m long has a radius of 0.85 cm and 630 turns. It carries a current I of 2.5 A. What is the approximate magnetic field B on the axis of the solenoid
A string vibrates according to the equation y = 0.5 sin 0.37 x cos 64 t, where x and y are in centimetres and t is in seconds. What is the velocity (in centimetres/second) of the component waves whose superposition can give rise to this vibration?
An electron is observed traveling at a speed of 25.7·106 m/s, How far will the electron travel before coming to a stop
After a long time thus that the capacitor is fully charged, the switch is opened. Find what is the time constant for discharging the capacitor
A plate carries a charge of -3.11mC,while a rod carries a charge of +2.02mC.How many electrons must be transferred from the plate to the rod,so that both objects have the same charge.
The potential difference between the plates of a leaky(meaning that charge leaks from one plate to the other) 2.0 uFcapacitor drops to one-fourth its initial value in 2.0s
An ideal gas in a container of volume 0.15m^3 at 0c is kept under the pressure of 10 atm. Determine the number of gas molecules in the container
A .30-06 rifle fires a bullet with a mass of 10 g at a velocity of 800 m/s. If the rifle has a mass of 4 kg, what is its recoil speed
A nonreflective coating (n = 1.30) covers the glass (n = 1.52) of a camera lens. determine the minimum nonzero thickness
A 3.0 g bullet traveling at 350 m/s hits a tree and slows down uniformly to a stop while penetrating a distance of 12 cm into the trees trunk. What is the force exerted on the bullet in bringing it to rest.
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