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Q1. A krypton laser produces the cylindrical red laser beam 2.0mm in diameter with 2.0W of power. What is the light intensity on a wall 0.70 m away from the laser?
Q2. Estimate g for space shuttle territory, 180km above Earth's surface. Earth's mass is 6 x 10^24 kg and its radius is 6380km.
Q3. On a workday an average decibel level of the busy street is 89 dB, with 100 cars passing a given point every minute. If the number of cars is reduced to 30 every minute on a weekend, what is the decibel level of street?
How long does it take for amplitude to drop to half its initial value . How long does it take for mechanical energy to drop to half its initial value.
What is wavelength of the X-ray photon
What was the average acceleration throughout the trip
What is magnitude of the Coulomb force
What is tension in each of the cables
A staging that weighs 440 N supports two painters, one 110 N and the other 460 N. The reading in the left scale is Ft = 800 N. What is the reading Fr, in the right hand scale.
What is the magnitude and direction of the magnetic field
A disk of radius R = 9 cm is pulled along a friction less surface with a force of F = 15 N by a string wrapped around the edge. At the instant when d = 28 cm of string has unwound off the disk, what is torque exerted about the center of the disk.
A ball has fallen to the street below, and a passerby returns it by launching it at an angle of 53.0° above the horizontal at a point 26.0 m from the base of the building wall. The ball takes 2.20 s to reach a point vertically above the wall.
What average force athletes legs apply on a ground
What would be apparent speed of the spacecraft image
What is the frictional force
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