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An air-filled lead balloon of radius R is totally submerged in a tank of water. (a) Show that the thickness of the skin of the lead balloon is t=(Pw/Ppb)(R/3) where Pw and Ppbare the densities of water and leadrespectively. (b) Calculate the thickness if the balloon has a radius 0.1 meters and the density of lead is given by 11.3E3 kg/m^3.
The tension in the horizontal towrope pulling a water-skier is 240 N, How much work does the towrope do on the water-skier
question a child throws a ball downward from a tall building. note that the ball is thrown not dropped and disregard
A radio-controlled car increases its kinetic energy from 8 J to 10 J over a distance of 5 m. What was the average net force on the car during this interval
A cross section of an infinite conducting sheet carrying a current per unit x-length of λ; the current emerges perpendicularly out of the page
Given a saturation vapor pressure of 57mb, and relative humidity of 50%, find the saturation temperature (temperature at the LCL, Lifted Condensation Level).
One liter of water is 41C is used to make iced tea. How much ice at 0 C must be added to lower the temperature of the tea to 17C? The specific heat of water is 1 cal/g C and latent heat of ice is 79.7 cal/g. Reply in units of g.
A comet of mass 1.3 1010 kg moves in an elliptical orbit around the Sun. Its distance from the Sun ranges between 0.545 AU and 79.0 AU. What is the eccentricity of its orbit
When red light in a vacuum is incident at the Brewster angleon a certain type of glass, the angle of refraction is 24.7°. evaluate the index of refraction of the glass
A pendulum of length L = 8.40 m with a bob of mass m = 18.0 kg is pulled aside until the bob is a distance L = 6.72 m above its equilibrium position
A rocket with an initial mass of 1 000 kg adjusts its thrust by varying the rate at which mass is ejected. at what rate is mass being ejected at that instant
A 4.6m -wide swimming pool is filled to the top. The bottom of the pool becomes completely shaded in the afternoon when the sun is 20?above the horizon, How deep is the pool
In a crash test, a test car of mass 1711 kg is moving at a speed of 37.2 m/s when it crashes into a wall. how much average power (in W) is expended in this process
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