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An electron is accelerated from rest by a potential difference of 350 V. It then enters a uniform magnetic field of magnitude 200 mT with its velocity perpendicular to the field.
(a) Calculate the speed of the electron.(b) Calculate the radius of its path in the magnetic field.
A molecule of DNA (deoxyribonucleic acid) is 2.28 µm long. The ends of the molecule become singly ionized: negative on one end, positive on the other. Determine the effective spring constant of the molecule
Shaving/makeup mirrors typically have one flat and one concave (magnifying) surface. compute the focal length of the mirror
The potential equals 7.52 V at the midpoint between two point charges that are 0.95 m apart. One of the charges is 1.10 10-9 C. Find the value of the other charge.
at a point p the electric field is 71 nc at 22 degrees clockwise from the positive x axis. a particle of mass 1.5 kg
Assuming an electron free Earth. Find the force on a single proton just above Earths surface under these conditions. Compare your answer with the weight of the proton.
A bird stands on a dc electric transmission line carrying 3200A. What is the potential difference between the bird's feet
An object of mass 2.00 kg is held at a position A, a vertical height of 20.0 m above the ground. Point B is 8.00 m directly below A. Neglect air resistance and use g = 10.0 m/s.
A model of a helicopter rotor has four blades, each 3.60 m in length from the central shaft to the bladetip. What is the radial acceleration of the blade tipexpressed as a multiple of the acceleration due to gravity,g?
a 384 kg piano slides 3.6 m down an 27deg incline and is kept from accelerating by a man who is pushing back on it
A block is projected up a frictionless inclined plane with initial speed v0 = 1.44 m/s. The angle of incline is ? = 45.8°. How long does it take to get there
A pump draws water through a 150 mm diameter pipe from a reservoir whose surface level is at datum level and discharges it through a 100 mm diameter pipe to another reservoir whose surface level is 72 m above datum level.
A wire 3.00 m long and 0.450 mm2 in cross-sectional area has a resistance of 40 at 20°C. what is the temperature coefficient of resistivity
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