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The electric field midway between two equal but opposite point charges is 845 N/C, and the distance between the charges is 16.0 cm. What is the magnitude of the charge on each?
A small motor is mounted on the axis of a space probe with its rotor (the rotating part of the motor) parallel to the axis of the probe. Through how many revolutions has the rotor turned
Two people on ice skates are at rest and stand facing each other. They then push each other away. The mass of the person on the left is 90 kg. Which person has the higher speed
A railroad freight car of mass3.24multiplied by104kg collides with a stationary caboose car. Find the mass of the caboose
He-Ne lasers are often used in physics demonstrations. They produce light of wavelength 633nm, What is the average energy density in the laser beam
The projection lens in a certain slide projector is a single thin lens. A slide 23.6 mm high is to be projected so that its image fills a screen 1.87 m high. Determine the focal length of the projection lens
Identical samples containing 32P are measured for a period of 1 hr in a counter having an efficiency of 44 percent and a negligible background. From a large number of observations, the mean number of counts in 1 hr is (2.93 x 10^4)
A pair of flat mirrors meet to form a right angle. A beam of light is incident on one of them at a point 11.5 cm from their point of intersection, what is the angle of incidence at the first mirror
He+ is a helum atom with one electron missing. Treating this like a hydrogen arom, what is the first excited state of this atom
Since there is no accommodation and the implant allows for correct distance vision, a corrective lens for close work or reading must be used. calculate the power of the lens in the reading glasses
Estimate the size of sensitive cells of the human eye, provided that the entrance pupil of the eye about 1 mm in diameter under usual sunlight conditions. Assuming the size of sensitive cells is such that diffraction limit is met.
To demonstrate the tremendous acceleration of a top fuel drag racer, you attempt to run your car into the back of a dragster that is "burning out" at red light before the start of a race. (Burning out means spinning the tires at high speed to heat..
A 4.0 ohm resistor is connected in parallel with a 12 ohm resistor and both of these are connected to a DC power supply with voltage V. what is the current through the 4.0 ohm resistor
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