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Double stranded DNA molecule negatively charged with a charge density of -e per nanometer
1. what is the electric field due a DNA molecule at a distance of 10 nm?
2. have 2 DNA molecules each 3 (mew)m length separated by a distance of 10 (mew)m what is the magnitude of the force between the 2 molecules? is attractive or repulsive?
3. is it valid to use the result for an line of charges?
A 6.0cm tall object is placed 39cm in front of a spherical mirror. It is desired to produce a virtual image that is upright and 4.8cm tall
A laser beam aimed from the earth is swept across the face of the moon. a. If the beam is rotated at an angular velocity of 1.55*10^-3 rad/s , what is the angle of divergence of the laser beam
Three resistors with values 0.90? , 2.9? , and 4.2? are connected in parallel in a circuit with a 6.4V battery. What is the total equivalent resistance
A magnetic field is perpendicular to the plane of a single-turncircular coil. The magnitude of the field is changing, so that anemf of 0.65 V and a current of3.1 A are induced in the coil. The wire isthe re-formed into a single-turn square coil, w..
Artificial gravity. One way to create artificial gravity in a space station is to spin it. If a cylindrical space station 275 m in diameter is to spin about its central axis, at how many revolutions per minute (rpm) must it turn so that the outermost..
two crates, of mass m1 = 71kg and m2 = 133kg , are in contact and at rest on a horizontal surface. Force F = 610N is exerted on the 71-kg crate. Determine the acceleration of the system
Two capacitors are connected parallel to each other. Let C1= 3.50?F ,C2 = 5.50?F be their capacitances, Calculate the potential difference across each capacitor
a 20 nc point charge is placed on the x axis at x 2.0 m and a -25 nc point charge is placed on the y axis at y - 3.0
Your company makes anemometers and plans to install light bulbs on them for high wind warnings. calculate the number of turns in the coil wire needed to light the bulb
The combination of an applied force and a friction force produces a constant total torque of 35.2 N · m on a wheel rotating about a fixed axis. The applied force acts for 6.10 s. During this time, the angular speed of the wheel increases from 0 to..
two identical point charges q 9.20 x 10-6 c are fixed at opposite corners of a square whose sides have a length of
Two air-track gliders of equal mass are initially moving in the same direction along a straight line. What is the speed of the first glider (rearmost) after the collision
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