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A 5 kg block, measuring 10 cm per side, is held 50% submerged in water by a Helium balloon. If the density of Air is 1.18g/L, Helium is 0.1649 g/L, and H2O is 1000g/L, what is the diameter of the balloon.
For 140 keV gamma rays, the mass attenuation coefficients for hydrogen and oxygen are 0.26 and 0.14 cm^2/g, respectively. What is the mean free path in water at this energy
A 12.0 m long conveyor belt, inclined at 40.0°, is used to transport bundles of newspapers from the mailroom up to the cargo bay to be loaded on to delivery trucks. Each newspaper has the mass of 1.00 kg, and there are 26 newspapers per bundle. Concl..
How much work is required to pull him 75 m up a 30° slope (assumed frictionless) at a constant speed of 2.1 m/s? Your response differs from the correct answer by more than 10%. Double check your calculations. Illustrate what power must a motor have t..
Use the blackbody radiation law to estimate the wavelength of maximum intensity for the light from the sun's photoshere
A new circus act is called the Texas Tumblers. Lovely Mary Belle swings from a trapeze, projects herself at an angle of 53, and is supposed to be caught by Joe Bob, whose hands are 6.10 above and 8.02 horizontally from her launch point. You can ignor..
A 160 m wide river flows due east at a uniform speed of 4.05 m/s. A boat with a speed of 7.2 m/s relative to the water leaves the south bank pointed in a direction 39o west of north. What is (a) magnitude and (b) direction of the boat's velocity r..
A converging lens can be used as a lighter (on a sunny day). If you want to use it to light a match, where should you put the match, What is the radius of the mirror
A cube of ice is taken from the freezer at -8.0 and placed in a 113 aluminium calorimeter filled with 306 of water at room temperature of 20.0. The final situation is observed to be all water at 15.0.
A capacitor consists of square conducting plates 28cm on a side and 5.5mm apart, carrying charges ± 1.8?C, Find the stored energy
A 14 g ball of clay travelling east at 3.0 m/s collides with a 30 g ball of clay travelling north at 2.00m/s. What are the speed and the direction of resulting 44 g ball of clay.
A radar for tracking aircraft broadcasts a 12.0GHzmicrowave beam from a 2.00m -diameter circular radar antenna, What is the diameter of the radar beam at a distance of 30.0km
An engine goes through the following cycle with 2.20 sample of a diatomic gas. I. an isothermas expansion from point a to point b. II. a constant pressure compression from point b to point c. III.
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