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A very thin sheet of plastic (n=1.65) covers one slit of a double-slit apparatus illuminated by 640nm light. The center point on the screen, instead of being a maximum, is dark.
What is the (minimum) thickness of the plastic?
A 3.60 {rm m}-long, 430 {rm kg} steel beam extends horizontally from the point where it has been bolted to the framework of a new building under construction. A 66 {rm kg} construction worker stands at the far end of the beam.
At what angle does it leave the field region?
A rotating cylinder about 16 {rm km} long and 6.8 km in diameter is designed to be used as a space colony. With what angular speed should it rotate so that the residents on it will experience the same acceleration due to gravity as on Earth.
A 6.30kg block is pushed 9.45m up a smooth 37.0? inclined plane by a horizontal force of 80.0N . If the initial speed of the block is 3.35m/s up the plane. Calculate the initial kinetic energy of the block
Find the mass flow rate in through the vent in question #1 using the following well-known relationship for the mass flow into an opening:
Light of wavelength 665 nm is used to illuminate normally two glass plates 12 cm in length, How many bright fringes appear along the total length of the plates
The unstable isotope 234Th decays by beta emission with a half-life of 24.5 days. what is the decay rate after 37 days
A loudspeaker of mass 24.0 {rm kg} is suspended a distance of h = 1.40 {rm m} below the ceiling by two cables that make equal angles with the ceiling. Each cable has a length of l = 3.70 {rm m}.
How fast is the mass moving at the top of its new path (directly above the peg)?
A small piece of rock is weighed in air and then weighed while immersed in oil of density 800 kg/m3. If the weight in air is 21.5 N and the weight in the oil is 11.8 N, calculate the density of the rock
Two point charges are located on the axis as follows: charge = -2.00 at = -0.500 , and charge = 2.80 at the origin ( = 0). What is the magnitude of the net force exerted by these two charges on a third charge = 9.00 located at = 0.250?
You buy an ice cream cone. The cone you are given is filled with melted ice cream of density 1.2g/cm^3. Find the pressure at the bottom of the cone
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