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A star moves at speed of 5x10-3c away from the earth. It emits light at a wavelength of 5890A (observed on the star). What is the wavelength of light observed on the earth? The maximum wavelength human eyes can see is 6500A. How fast does the star have to move for its light to be invisible to an earth observer?
A Styrofoam ball of the same size as the lead ball takes a longer time to reach the ground. Which of the following is a good explanation for this? Briefly, describe your reasoning. Air resistance is a significant force in this problem
An infinitely long cylinder, of radius R, carries a frozen-in magnetisation, parallel to the z-axis, M=k s k-hat, where k is a constant and s is the distance from the axis. there is no free current anywhere.
An electron with mass 9.11×10-31 kg moves with a speed of 2.00×106 m/s in a circle of 2.83 cm radius under the influence of a magnetic field. What is the radius of the proton's orbit
A lens appears greenish yellow (λ=575 nm) when illuminated with white light. The index of refraction of the lens is 1.52. What is the minimum thickness of the coating (n=1.30) used on the lens to give it this hue?
Electrons have a charge of q = -1.602 × 10-19 C. A student observes a Styrofoam cup has a total charge of Q = -0.34 C. Compute how many electrons are in the cup
a total of 3.02 106 electrons are placed on an initially uncharged wire of length 1.45 m.a what is the magnitude of
A 1350 kg car accelerates uniformly from 35.5 km/h to 75.5 km/h over 250 m. Determine the time taken for the car to accelerate
Two forces F1 and F2, act at a point. F1 has a magnitude of 9.20N and is directed at an angle of 61.0 degrees above the negative x axis in the second quadrant. What is the magnittude of the resultant force
Starting from rest, a 12 cm diameter compact disk takes 2.4 s to reach its operating angular velocity of 2030 rpm. How much torque is applied to the disk
A person is standing 8 m away from a speaker and experiences an intensity level consistent with the standard pain threshold. what is the power of the speaker
A rocket burns fuel at a rate of 200 kg/s and exhausts the gas at a relative speed of 4.0 km/s. Find the thrust of the rocket
A (perfect) transformer has 20 V and 2 A in its primary coil, 200 turns in its primary circuit, and 20 in its second. How much power is in the secondary circuit
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