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A hot air balloon is a bit like a bubble in water. It rises in air when the mass of relatively cool surrounding air displaced by the balloon is greater than the mass of the balloon and the gondola that hangs below it. There is a big opening at the bottom of the balloon where a propane burner that heats the inside air is located. Air is free to move in or out of the balloon through the opening. What is the buoyancy? do we use archimedes principle?
What are ranges of wavelength and frequency
Coherent light with wavelength 610 passes through two very narrow slits, and the interference pattern is observed on a screen a distance of 3 from the slits. The first-order bright fringe is a distance of 4.84 from the center of the central bright..
A flat, uniform, circular disk (R = 2.25 m, m = 84.0 kg) is initially at rest, but it is free to rotate in the horizontal plane about a vertical, frictionless axis through its center.
Before going into orbit, an astronaut has a mass of 55 kg. While in orbit, a measurement determines that a force of 100 N causes her to move with the acceleration of 1.90 m/s2. To regain her original weight, must she go on a diet or start eating m..
A small but measurable current of 1.2*10^-10 A exists in a copper wire whose diameter is 2.5mm compute the current density and the electron drift speed.
What is the mass of the liquid in the vat.
The shaft shown below has a solid round cross-section & is supported by bearing at A & B. Find the location of maximum bending stress in the shaft.
What is the resultant velocity of the lightning bug. find the force provided by the cable.
A 16 cm x 16 cm square loop of wire lies in the xy-plane with its bottom edge on x-axis. The resistance of the loop is 0.490 ohms. A magnetic field parallel to the z-axis is given by B= 0.830 y^2 t, where B is in tesla, y in meters, and t in seconds...
What is the frequency of up and down oscillations of the wheel? Regard wheel as a mass on one end of a spring and regard the body of the car as a fixed support for the other end of the spring.
At time t = 0, the hockey puck is sent sliding over a frozen lake, directly into a strong wind. Gives the velocity v of the puck versus time as puck moves along a single axis. (The time axis is marked in increments of 0.25 s.) At t = 2.8 s, what i..
The specific heat of water is 4186 J/kg·K. The latent heat of fusion is 333 kJ/kg. The density of water is 1.00 g/cm3.
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