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A protein molecule is suspended in a gel, and has 31 excess electrons (hence the protein molecule is negatively charged). If placed in an electric field of 600 N/C, what is the (electric) force on this molecule?
An electromagnet is made by inserting a soft iron core into a solenoid. The solenoid has 1800 turns, radius 2.0 cm, and length 25 cm. What is the relative permeability KB of the iron core
the filament of a light bulb has a resistance of 570 . a voltage of 120 v is connected across the filament. how much
What is an average power output of the laser. What is the rms value of the electric field in the beam.
A light board, 10 m long, is supported by two sawhorses, one at one edge of the board and a second at the midpoint. What is the force exerted by the sawhorse at the end of the board
A uniform electric field of magnitude 640 N/C exists between two parallel plates that are 4.40 cm apart. A proton is released from the positive plate at the same instant that an electron is released from the negative plate.
A one-meter long stick ("meter stick") has mass 120 grams, and is hinged at one end (pivot). Calculate the rotational inertia of the stick
A square wire loop 11.0 cm on each side carries a clockwise current of 16.0 A. Find the direction of this magnetic field
A golfer hits a shot to a green that is elevated 3.20 m above the point where the ball is struck. find the speed of the ball just before it lands.
An elastic cord is 64 cm long when a weight of 56 N hangs from it and is 69 cm long when a weight of 83 N hangs from it. What is the "spring" constant of this elastic cord.
Suppose a 100m diameter stony (p= 3 g/cm^3) meteroid impacts the Earth with a speed of 20km/s. Assume all kinetic energy goes into the creation of an atmospheric blast wave.
A steel ball of mass 0.840 kg is fastened to a cord that is 75.0 cmlong and fixed at the far end. The ball is then released when thecord is horizontal (Fig. 9-68). At the bottom of its path, the ballstrikes a 2.40 kg steel block initially at rest on ..
Light of a wavelength 450 nm is incident on a sodium emitter in a photoelectric effect apparatus. Sodium is 2.3 eV, What is the stopping potential for the emitted electrons
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