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The concrete wall of a building is 0.147 m thick. The temperature inside the building is 22.4 °C, while the temperature outside is 0.0 °C. Heat is conducted through the wall. The outside of the wall loses the energy only due to radiation. What is the emissivity of the wall?
There should be no unit
Dr Jeeves has invented a new kind of heat engine that operates using a pool of molten copper at 1083 degrees celcius and a block of solid lead at 327 degrees celcius. How much power is produced by the engine
A projectile is fired at an angle of 55.0 degrees above the horizontal with the initial speed of 35.0 m/s. How long does it take the projectile to reach the highest point
In a closed piston-cylinder device, an isothermal expansion of anideal gas from 1.5 m3 to 4.7m3 occurs at a temperature of 99oC. How much heat is need to complete the process
What are its potential positive and negative impacts on society at large, and what ethical role does the scientist play (or does not play) in the end result of what science is used for?
consider two identical particles in a 1D infinite square well of length L. write the symmetric and anti-symmetric spatial ground state wave functions
The focal length of a bi-convex lens is 10 cm. The focal length of a convex-concave thin lens is -20 cm. If placing them in parallel and in close contact, what is the compound focal length
A person of mass 80kg stands at the center of a rotating merry-go-round platform of radius 3.2m, Calculate the rotational kinetic energy of the system of platform plus person before and after the person's walk
After considerable use, the walls of the channel became rougher and the Manning coefficient, n, doubled. Determine the new value of L if the flowrate stayed the same.
water is pumped into a storage tank from a well delivering17.8 gallons of water in 30 seconds through a pipe of 1.16 inchessquared cross sectional area. What is the average velocity of the water in the pipe
Consider a capacitor C being discharged through a resistor R as shown in figure a. The initial potential difference across the capacitor is 24.0 V, Compute the initial charge and time constant
A steel spoked motorcycle wheel without the rubber tire is rotating by angular speed of 27.3 rad/s. The temperature of the wheel changes from 10 degrees Celsius to 210 degrees Celsius.
According to the student's watch, how much time does she actually have for lunch if she wants to go to the furthest restaurant (including travel time)?
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