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A molecule of DNA (deoxyribonucleic acid) is 2.16 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 1.09% upon becoming charged. Determine the effective spring constant of the molecule.
An iron casting containing a number of cavities weighs 16967.7 N in air and 13515.2 N in water. What is the total volume of all the cavities in the casting
Two 100cm2 parallel electrodes are spaced 2cm apart. Oneis charged +5μC, the other -5μC, A 1.0cm x 1.0cm surfacebetween the electrodes is tilted to where its normal makes a 45degree angle with the electric field. What is the electric flux through ..
(from Roger Ordidge, with alterations) The magnetic field can store energy, but it can do 110 work. Therefore, another agency must be responsible for doing the work that puts the energy into the magnetic field.
A positively charged He+ atom has two protons in the nucleus and one electron in the shell. In a classic model of the atom, What is the radius of the orbit
A 0.95 kg air-track glider is attached to each end of the track by two coil springs. It takes a horizontal force of 0.500 N to displace the glider to a new equilibrium position, x= 0.130 m.
When you lift a bowling ball with a force of 80.2 N, the ball accelerates upward with an acceleration a. Calculate the weight of the bowling ball
A lens for a 35-mm camera has a focal length given by f = 67 mm. What is the magnification of the image on the film
the drawing shows a type of flow meter that can be used to measure the speed of blood in situations when a blood vessel
When point charges q1 = +7.0 ?C and q2 = +6.6 ?C are brought near each other, Determine the distance between the charges
What is the total charge of the uranium nucleus? (The neutral uranium atom has 92 electrons.), What is the magnitude of its electric field at a distance of 1.48×10-10 m from the nucleus
A juggler throws a ball from height of 0.950 m with a vertical velocity of +3.75 m/s and misses it on the way down. What is its velocity when it hits the ground
Find the size of the net force produced by a 7 N and an 12 N force in each of the following arrangements. (a) The forces act in the same direction. N= (b) The forces act in opposite directions. N= (c) The forces act at right angles to each other. ..
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