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Physics, 22.06.2019 08:30
An object weigh 40n in air ,weigh 20n when submerged in water,and 30n when submerged in a liquid of unknown liquid density.what is the density of unknown of liquid?
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An insulated 40 ft^3 rigid tank contains air at 50 psia and 120°f. a valve connected to the tank is now opened, and air is allowed to escape until the pressure inside drops to 25 psia. the air temperature during this process is kept constant by an electric resistance heater placed in the tank. determine the electrical work done during this process.
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Physics, 22.06.2019 13:00
Discuss how the hardness or softness of the landing surface is related to the time required to stop the egg
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Đặt điện tích q=2.10-5C tại gốc tọa độ O của hệ trục Oxy. Xét hai điểm A(6;0) và B(3;4) trên hệ trục...
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