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A small drop of water is suspended motionless in air by a uniform electric field that is directed upward and has a magnitude of 8410 N/C. The mass of the water drop is 3.20 x 10-9 kg.
(a) Is the excess charge on the water drop positive or negative?
(b) How many excess electrons or protons reside on the drop?
Many cheap electric stoves have three settings on their switch (besides OFF) labelled LOW MED and HIGH. What is the total element resistance in each case
a capacitor is connected across an ac generator whose frequency is 810 hz and whose peak output voltage is 170 v. the
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What fraction of the original kinetic energy of puck dissipates during the collision, kinetic friction before is 40 m/s, kinetic friction after is 29.3 m/s
calculate the radius of the circular orbit if the magnetic field is B=1.7 and the velocity is 6.3x10^6. assuming it is 1 electron
A contact lens is made of plastic with an index of refraction of1.52. The lens has an outer radius of curvature of+1.94cm and an inner radius of curvature of+2.54cm. What is the focal length of the lens?
A point source of light is submerged 2.4 m below the surface of a lake and emits rays in all directions. What is the maximum radius that this circle could have
What is the main optical element of a refracting telescope? A department store sells an "astronomical telescope" with anobjective lens of 30 cm focal length and an eyepiece lens of focallength 5 mm. What is the magnifying power of this telescope?
the diameters of the main rotor and tail rotor of a single-engine helicopter are 7.68 m and 1.02 m respectively. the
A wooden raft has a mass of 45 kg. When empty it floats in water (density 1000 kg/m3) with 68% of its volume submerged. What mass of sand could be put on the raft without it sinking.
The rectangular loop in the drawing consists of 75 turns and carries a current of I = 4.9 A. compute the magnitude of the net torque exerted on the loop
The two stars in a binary star system have masses 1.9 x 10^30kg and 6.1 x 10^30kg. What is the speed of the heaviest star
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