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A laser beam has a power of 1 mW and a diameter of 2.257 millimeter. Find how many photons are emitted per second over an area of 1mm^2, λ =632.8 nm?
a uniform piece of aluminium is 4m by 4m and 2cm thick. a 1m by am square piece is cut out from it. the center of the
A 85.5-kg horizontal circular platform rotates freely with no friction about its center at an initial angular velocity of 1.59 rad/s. Find the angular velocity of the platform with its load
question a diffraction grating with 305 linesmm is 1.00 m in front of a screen. what is the wavelength of light whose
A mass of 1.0 kg is pushed against a spring with a spring constant of 25 N/m. What is the amount of potential energy acquired by the spring when it is compressed
A 10-cm-diameter cylinder of helium gas is 20 cm long and at 20°C. The pressure gauge reads 120 psi. how many helium atoms are in the cylinder? what is the mass of the helium?
Estimate the average number of atoms comprising a bacterium for example Escherichia coli. Assume that the bacterium is a cylinder of 2mum length, 0.5mum diameter (and for practical purposed is made up mainly of water, which has a density of 1kg/liter..
A husband and wife take turns pulling their child in a wagon along a horizontal sidewalk. find the magnitude of the pulling force exerted by his wife
a what is the minimum energy eo stored in a resonant lc circuit?b find an expression for the value of capacitance c if
Two concentric metal spheres are found to have a potential difference of 776.0 V when a charge of 3.026·10-8 C is applied to them. What is the radius of the inner sphere
If you stand on a bathroom scale, the spring inside the scale compresses 0.40mm, what does the scale read at its peak
A magnet in the form of a cylindrical rod has a length of4.90 cm and a diameter of 1.10 cm. What is its magnetic dipole moment
A ball is thrown upward at 20 m/s from the top of a building, which is 100 meter high. Another ball is thrown downward from the top of the building at 15 m/s. What is their final speed when they hit the ground
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