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Three equal point charges, each with charge 1.95uc , are placed at the vertices of an equilateral triangle whose sides are of length 0.400m . What is the electric U potential energy of the system? (Take as zero the potential energy of the three charges when they are infinitely far apart.) Use E0= 8.85×10?12 C^2/N*m^2 for the permittivity of free space.
The lines in a grating are uniformly spaced at 1520nm. Analyse the angular separation of the second order bright fringes between light of wavelength 603nm and 615.4 nm. Reply in units of mrad.
Four point charges, q, are fixed to the four corners of a square that is 10.3 cm on a side. What is the magnitude of each fixed charge in coulombs
Suppose that the resistance of such a resistance thermometer is 105? when its temperature is 17.2 °C. The wire is then immersed in a liquid, What is the temperature of the liquid
A majorette in a parade is performing some acrobatic twirlings of her baton. Assume that the baton is a uniform rod of mass 0.120kg and length 80.0m With a skillful move, the majorette changes the rotation of her baton so that now it is spinning abou..
A man doing a slow push-up is approximately in static equilibrium. His body is horizontal, with his weight of 763 N supported by his hands and feet, how far from the shoulders is the man's center of gravity
When a 0.20-kg block is suspended from a vertically hanging spring, it stretches the spring from its unstrained 0.005 m. find the total mechanical energy of the system at any instant
a 1.2-m-long steel rod with a diameter of 0.50 cm hangs vertically from the ceiling. By how much does the rod stretch
A net torque of 36N*m acts on a wheel rotating about a fixed axis for 6 s. During this time the angular speed of the wheel increases from 0 to 12 rad/s. What is the magnitude of the frictional torque
Sunlight is observed to focus at a point 18.5 cm behind alens. What is its power in diopters
A 5,000 kg satellite is orbiting the Earth in a circular path. The height of the satellite above the surface of the Earth is 800km. The velocity of the satellite is (Me = 5.98 x 10^24 kg, Re = 6.37 x 10^6 m, G = 6.67 x 10-11 N • m2/kg2)
An electron (charge -e) is projected horizontally into the space between two oppositely charged parallel plates. The electric field between the plates is 462N/C upward.
A mirror has a focal length of 10 cm. An object is located 15 cm to the left of the mirror. What is the total magnification for the two images
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