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The density of air decreases with altitude. Consider a planet having a layer of atmosphere extending no more than 70.0 km above the surface. The atmospheric pressure at the surface of this planet is 80.0 kPa, and the average radius of this planet is 6.70×106 m. Decide the mass of air in this atmosphere. You will require to take into account the fact that g varies with altitude. The density of the planet itself is 5550 kg/m3.
The force of the wind on the sails of a sailboat is 390 Newton north. find the direction and magnitude of the acceleration of sailboat
An inductor is connected to the terminals of a battery that has an emf of 12.0 V and negligible internal resistance. What is the resistance R of the inductor
a professors office door is 0.96 m wide 2.2 m high 4.1cm thick has a mass of 20 kg and pivots on frictionless hinges. a
In a specific heat experiment 212.0 grams of aluminum (C=913.0 J/kg.K) at 100.0°C) is mixed with 64.0 g water at 20.0°C. Find the entropy change of the aluminum
suppose you wish to improve the efficiency of a carnot engine. compare the improvement to be realized via each of the
A helicopter, starting from rest, accelerates straight up from the roof of a hospital. The lifting force does work in raising the helicopter. What is the average power generated by the lifting force
A 1.30 kg mass on a spring oscillates horizontally with little friction according to the following equation: x=0.0500cos(2.90t), Find the maximum energy stored in the spring during an oscillation
A solar cell generates a potential difference of 0.400 V when a 150.0 ? resistor is connected across it, What is the emf of the cell
A satellite is in a circular orbit around the Earth at an altitude of 3.38 106 m. Find the acceleration of the satellite
a typical house is built on a cement slab with four walls and a roof. the thermal conductivities of the four walls the
Suppose a cube of aluminum which is 1.00 cm on a side accumulates a net charge of +3.10 pC. (a) What percentage of the electrons originally in the cube was removed.
Nearly plane waves of C02 laser light of wavelength l = 10.6 m emerge from a circular aperture 10 cm in diameter. If the C02 laser light is to be examined on a target in the far field
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