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If I put 40g of ice at 0°C into a perfectly insulated cup containing 250g of coffee at 90°C, what will the final temperature be when the system comes into thermal equilibrium? Suppose that the specific heat of coffee is the same as that of water.
A 70 ohm lamp and a 75 ohm lamp are connected in series and placed across a potential of 41 V. What is the equivalent resistance of the circuit
A camera lens used for taking close-up photographs has a focal length of 21.5 mm. The farthest it can be placed from the film is 30.0mm. What is the closest object that can be photographed
THe index of refraction of gold is n= .31 + i2.88 at 560nm, and n=12.2 + i54.7 at 9.92um. Find the normal incidence absorptivity and reflectivity at both wavelengths. Please show each step by step.
The average kinetic energy per molecule of an ideal gas with originally Ni=1000 molecules is Kavg=500J. What is the final number of molecules Nf after this process
a converging lens of focal length 8 cm is 20 cm to the left of a diverging lens of focal length - 6 cm. a coin is
Consider a cube of sides a = 4.60 m, as shown in the diagram below. Suppose that an electric field is present and is given by E = bxn, Calculate the magnitude of the total charge within the cube
A thin transparent film has an index of refraction of 1.57. It consists of a flat plate with air on both sides of the film. Determine the minimum thickness of the plate
A liquid of density ρ is poured slowly on top to push piston down. How far will the piston push down
Determine the least value of n for which there is total internal reflection on the vertical surface.
The isotope lithium-7 has a mass of 7.0160 atomic mass units, andthe isotope lithium-6 has a mass of 6.0151 atomic mass units. calculate the average atomic mass of lithium
High power lasers are used to cpmpress a plasma (a gas ofcharged particles) by radiation pressure. Find the pressure exerted on the plasma if the plasma reflects all the light beamsdirectly back along their paths
If the arm is 5.50-m long and pivots about one end, at what angular speed (in rpm) should it spin so that the acceleration of the lander is the equal as acceleration because of gravity at the surface of Europa? The mass of Europa is 4.8 times 10^ ..
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