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Hot air balloons contain a fixed volume of gas. When the gas is heated, it expands, and pushes some gas out at the lower open end. As a result, the mass of the gas in the balloon is reduced. Why would the air in a balloon have to be hotter to lift the same number of people above Colorado, Vail, which has an altitude of 2400 m, than above the tidewater flats of Virginia, at an altitude of 6 m?
oppositely charged parallel plates are separated by5.29mm. a potential difference of 600 v exists between the plates.a
White light shines on a 118nm thick sliver of fluorite (n=1.43). What wavelength is most strongly reflected
A 73 kg window cleaner uses a 17 kg ladder that is 5.1 m long. He places one end on the ground 2.4 m from a wall, What is the angle of this force on the ladder
A laser beam is incident at an angle of 38.0 degree to the vertical onto a solution of corn syrup in water. find what the index of refraction of the syrup solution
a computer disk rotates at a constant angular speed of 34.1rads while being read. when searching for a file the disk
A 0.470 kg pendulum bob passes through the lowest part of itspath at a speed of 3.80 m/s. What is the tension in the pendulum cable when the pendulumreaches its highest point
the storage battery of a car has an emf of 12 v. if the internal resistance of the battery is 0.4 omega what is the
Two tug boats are towing a ship. Each exerts a horizontal force of 5 tons and the angle between their towropes is 90 degrees. What net force is exerted on the ship?
The current in a solenoid with 21 turns per centimeter is 0.45A, Find the magnitude of the net magnetic field a radial distance of 0.70 cm from the straight wire.
A 70-kg climber is hanging by a rope off the edge of a cliff, with the top end of the rope tied to a 200-kg rock. However, the rock is sitting on an icy horizontal surface,
a nonreflective coating n 1.42 covers the glass n 1.52 of a camera lens. assuming that the coating prevents
you place a small lightbulb 70 cm from a concave mirror and find a real image 17 cm from the mirror. where should you
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