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A glass window pane is 1.2 m wide, 1.5 m wide and 3 mm thick. The temperature at the inner surface of the glass is 22o C and at the outer surface 4oC. How much heat is lost each hour through the window? The density of glass is 2300 kg/m3, the specific heat is 840 J/kgC, the coefficient of linear expansion is 8.5 x 10-6 1/C and thermal conductivity is 0.80 J/smC.
During a particular car crash, it takes just 0.18s for the car to come to a complete stop from 50 km h -1. At what rate is the car accelerating during the crash
If a person radiates about 67 W of power at room temperature, how long does it take for a person to radiate away the energy acquired by consuming a 260 Calorie donut?
A cosmic-ray proton in interstellar space has an energy of 17.0 MeV and executes a circular orbit having a radius equal to that of Earth's orbit around the Sun, What is the magnetic field in that region of space
the fermilab tevatron could accelerate protons and anti-protons to kinetic energies of 1000 gev 1 tev. by how much in
A playground merry go round of a diameter 6m and mass 240 kg is rotating at 12 rev/min about a frctionless vertical axle. Facing the axle, a 30kg child hops on to the merry go round and manages to sit down on its ledge. What is the new angular spe..
Waly Whacko claims to have invented a heat engine that will revolutionize industry. It runs between a hot source at 300oC and a cold sink at 25oC. What is the actual maximum efficiency of his engine
An ice skater has a moment of inertia of 5.0 kgm^2 when her arms are outstretched. how fast will she be spinning
As a baseball is being thrown, it goes from 0.0 to 40.0 m/s in 0.17 s. What is the acceleration of the baseball
A metal object has a net charge of 1.761 x 10-12 C. How many excess or missing electrons does it have
A magnetic field is oriented at an angle of 41degrees to the normal of a rectangular area 4.5cm by 6.3cm. If the magnetic flux through this surface has a magnitude of 4.9×10^?5T*m^2 , what is the strength of the magnetic field?
q1. a 35.0-kg child swings in a swing supported by two chains each 2.90 m long. the tension in each chain at the lowest
Assume a load resistor RLoad is placed in parallel with a 12 volt battery and you measure the voltage across this resistor to be 6 volts
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