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A hot-air balloon achieves its buoyant lift by heating the air inside the balloon, which makes it less dense than the air outside. Suppose the volume of a balloon is 1800 m3 and the required lift is 3300 N (rough estimate of the weight of the equipment and passenger). Calculate the temperature of the air inside the balloon which will produce the required lift. Assume the outside air is an ideal gas at 0°C. What factors limit the maximum altitude attainable by this method for a given load?
An RLC circuit consists of a 218 resistor, a 45 ?F capacitor, and a 298 mH inductor, What is the phase angle between the current and the applied voltage
You want to use a lens with a focal length of 37.0cm to produce a real image of an object, with the image twice as long as the object itself. Where should the object be placed
Two cars collide at an intersection. Car A, with a mass of 1900{kg} , is going from west to east, while car B, of mass 1500{kg} , is going from north to south at 17.0{m}/{s} . As a result of this collision, the two cars become enmeshed and move as on..
The eyepiece of a compound microscope has a focal length of 2.90 centimeter and the objective lens has f = 0.740 centimeter. Find the distance between the lenses when the microscope is adjusted for a relaxed eye
1. gaseous helium is to be used to quench a hot piece of metal. the helium is in storage in an insulated tank with
a calculate the shear modulus g of 1040 carbon steel.b using the shear modulus value calculated above calculate the
You have a parallel plate capacitor with plates of 1.3 m2, and the magnitude of charge on each plate is 6.7 C. What is the force on an electron between the plates?
A horizontal spring with k = 110 n/m has one end attached to the wall. A 240g block is pushed onto the free end, compressing the spring by 0.190m. what's its speed when it leaves the spring
Five equal negative point charges -q are placed symmetrically around a circle of radius R. Calculate the electric potential at the center of the circle
A proposed ocean thermal energy conversion (OTEC) system is a heat engine that would operate between warm water (18 degree Celsius) at the ocean's surface, Calculate the maximum possible efficiency of the system
an 8.00kg point mass and a 14.5kg point mass are held in place 50.0 cm apart. Find the magnitude of the acceleration of the particle
A tuning fork with a frequency of 440Hz is held just above the top of a uniform glass tube containing water, What is the speed of sound in air
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