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Spaceman Spiff sits just outside the Milky Way galaxy with a cup of liquid Helium which is at approximately 4K (-269 degrees C). He has with him a small sphere made entirely of copper which is at a temperature of 219K (-54 degrees C). After a certain amount of time his copper sphere comes into equilibrium with the liquid Helium. If his sphere has a diameter of 2 cm, a mass density of 8.96 g/cm3, and a specific heat of 0.386 J * K-1* g-1, and the process of the copper coming into equilibrium with the liquid helium burned off 150g of liquid Helium, what is the latent heat of vaporization of liquid Helium? (assume that 4K is the boiling point of He and there is more than 150g of He).
Dinoflagellates are single-cell creatures that float in the world's oceans; many types are bioluminescent. When disturbed by motion in the water, What is the power of the flash in watts
A world-class sprinter accelerates to his maximum speed in 4s . He then maintains this speed for the remainder of a 100m race, What is his average acceleration for the entire rac
A uniform stick 1.5 m long with a total mass of 300g is pivoted at its center. With what angular speed is the stick spinning
A 1.9kg block slides along a frictionless surface at 1.7m/s . A second block, sliding at a faster 4.9m/s , What was the mass of the second block
A sports car crosses the bottom of a valley with a radius of curvature equal to 95m. At what speed was the car traveling
The left end of a long glass rod 8.00 cm in diameter, with an index of refraction of 1.60, Find position in air of image if the left end of the rod were polished to a plane surface
The current through a 908 ohm resistor is 189 mA; to the nearest volt, what is the potential difference across the resistor
A circular solenoid contains 100.0 turns of wire and carries a current of 2.0 amps. Calculate the magnetic flux through one turn of the wire
Birds resting on high-voltage power lines are a common sight. The copper wire on which a bird stands is 2.5 cm in diameter and carries a current of 48 A. calculate the potential difference between its feet
Future space stations will create an artificial gravity by rotating. What rotation period will provide "normal" gravity
question1a bolt drops from the ceiling of a train car that is accelerating northward at a rate of 3.50 ms2.a what is
Find the maximum usable magnification for the 200 inch Hale telescope of the Mt. Palomar observatory
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