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A photographer uses his camera, whose lens has a 60mm focal length, to focus on an object 2.5m away. He then wants to take a picture of an object that is 30 cm away. How far must the lens move to focus on this second object?
The mass of a copper atom is 1.54 10-25 kg, and the density of copper is 8 920 kg/m3. Find the edge dimension of each cube
Earth's atmosphere is constantly bombarded by cosmic ray protons that originate somewhere in space. What would be the electric current intercepted by the total surface area of the planet
A microscope has a 16.8 cm tube length, a 0.64 cm focal length of the objective lens, calculate the microscope's magnification
State and explain magnetic dipole moment µ of a coil of number of turns N and area A carrying current i
A box of mass 5.8 kg is accelerated from rest by the force across a floor at a rate of 2.0 m/s2 for 8.2 s. Find the net work done on the box.
A child is pushing a merry-go-round. The angle through which the merry-go-round has turned varies with time according to ?(t)=?t+?t3, What is the initial value of the angular velocity
An 8300-pF capacitor holds plus and minus charges of 1.35×10?7C. What is the voltage across the capacitor
What is volume concentration
Let's build a helium atom. Start with a nucleus with 2 protons and 2 neutrons, Calculate the energy gained by the system constructing this atom
Suppose a uniformly charged (with a linear charge density) wire starts at point 0 and rises vertically along the positive axis to a length. Determine the x-component of the electric field at point. That is, compute near one end of a long wire, in the..
A plane wave of monochromatic light is incident normally on a uniformly thin film of oil that covers a glass plate. find the thickness of the oil film
Two parallel conducting plates are separated by 10.0 cm, and one of them is taken to be at zero volts. What is the voltage between the plates
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