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A solid concrete wall 4.0 m X 2.4 m X 30 cm thick has a thermal conductivity of 1.3 W/(mK) and separates a basement at 18C from the ground outside at 6C. How much heat flows during the walls in one hour?
A transformer has 450 turns in its primary coil and 30 turns in its secondary coil. Which one of the following statements concerning this transformer is true? This is a step-up transformer. The turn’s ratio is 15 for this transformer.
The escape speed from the Earth is 1.12 × 10^4 m/s, so a gas molecule traveling away from Earth near the outer boundary of the Earth's atmosphere would, at this speed, be able to escape from Earth's gravitational field.
a 5.0 box is on a frictionless 45 slope and is connected via a massless string over a massless frictionless pulley to a
air flows from a reservoir 2 0 0 1 40 p mn m t c acircdeg through a laval nozzle with a throat diameter of 0.1 m
A satellite has a mass of 92 kg and is located at 1.99 106 m above the surface of Earth. What is the magnitude of the gravitational force on the satellite
An archer's bow is drawn at its midpoint until the tension in the string is 0.835 times the force exerted by the archer. What is the angle between the two halves of the string
a mortar crew is positioned near the top of a steep hill. enemy forces are charging up the hill and it is necessary for
Two small-sized objects are placed on a uniform 9.00 {\rm kg} plastic beam 3.00 {\rm m} long, Find the location of the center of mass of this system by setting x=0 at the right end of the beam
An electric power station is producing 1.60 × 103 W of power that is to be sent to a small town located 11 km away, Find the power lost in heating the wires if the voltage is stepped up from 130 V to 1400 V
A 120 kg scaffold is 6.6 meters long. It is hanging with two wires, one from each end. A 540 kg box sits 1 meter from the left end. What is the tension in the right hand side wire?
the membrane that surrounds a certain type of living cell has a surface area of 4.00 10-9 m2 and a thickness of 1 10-8
two filaments of current infinitely long and strait that have current with the same magnitude. find the magnetic field
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