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A spherical balloon is made from a material whose mass is 3.00 kg. The thickness of the material is negligible compared to the 1.4 m radius of the balloon. The balloon is filled with helium (He) at a temperature of 305 K and just floats in air, neither rising nor falling. The density of the surrounding air is 1.19 kg/m3. Find the absolute pressure of the helium gas.
When playing fortissimo (very loudly), a trumpet emits sound energy at a rate of 0.750 W out of a bell (opening) of diameter 13.2 cm. What is the sound intensity level right in front of the trumpet
The plates of a parallel-plate capacitor have a separation of 2.28mm , and each has an area of 15.4cm2. find the magnitude of the electric field between the plates
Suppose a block of mass 5 kg is resting on a horizontal surface and coefficient of static friction between block and surface is 0.2. What is the reaction on the block by the vertical wall
A creamy salad dressing is made up of heavy cream, corn oil, and vinegar (as well as a pinch of dry mustard, salt and pepper). What is the order of the layers from top to bottom
How much energy is stored in a 11.2mH inductor carrying a 1.45A current? Solve for mJ
A cylindrical space station of radius R and length L has a density that varies with distance from its center, Calculate the total mass M of the entire space station
The efficiency of a knife is 75%. If you push down on the knife with a force of 5 N to cut a piece of cake that is 6 cm thick, how much work is done on the cake
A small piston with area A1 = 45 cm^2 acts in a cylinder to lift a larger piston A2 = 550 cm^2 Find the force on the small piston (F1) if the pressure in the system is 7000 pascals.
A steel cable with total length 30 m and mass 100 kg is connected to two poles. find the wavelength of the resulting wave on the cable
A 12.0-g piece of Styrofoam carries a net charge of -0.746 µC and is suspended in equilibrium above the center of a large, What is the charge per unit area on the plastic sheet
A step-down transformer is used for recharging the batteries of portable devices. calculate rms output voltage of the transformer
Green light (555 nm) is normally incident on a pair of slits which are 12mircometers apart. How many interference fringes will there be
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