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A college professor keeps 0.25 L (0.00025 m^3) of hot coffee in a thick styrofoam container. The container is 0.6 cm thick and has a total surface area of 0.025 m^2. Assume that the temperature of the inner wall surface is 85 C and that of the outer surface is 35 C. Assume the coffee's density and specific heat are the same as water's, 1000 kg/m^3 and 4184 J/Kg/C, and the thermal conductivity of styrofoam is 0.04 W/m/C.
a) at what rate is heat flowing out through the walls of the container?
b) At that rate, how long would it take for the temperature of the cofee to decrease by 1 Celsius degree?
A Radio transmitter's RLC oscillator circuit initially stores all its energy in the capacitor then begins to oscillate. What average power (in watts) would a correctly tuned and phase-matched AC power supply need to generate in order to prevent this..
In a double slit experiment, monochromatic light of wavelength 660 nm passes through a pair of slits separated by 3.40 x 10-5 m. find the angle corresponding to the first bright fringe
During practice, a soccer player kicks a ball, giving it a 32.5 m/s initial speed. It travels the maximum possible distance before landing down field. How far did the ball travel
What is the speed and total energy of an electron whose kinetic energy is 3 times its rest energy
Water has a mass per mole of 18.0 g/mol, and each water molecule (H2O) has 10 electrons. (a) How many electrons are there in 9.42 liters of water? (1 liter is equivalent to 1.00 × 10-3 m3) (b) What is the net charge of all these electrons?
Two blocks are travelling towards eachother. The first has a speed of 10cm/sec and the second has a speed of 60 cm/sec. compute the velocity of the first block after collision
An object of length 3.00 cm is inside a plastic block with index of refraction 1.40. find where is the object relative to its image
find its velocity after the explosion. The man pulls the boy up to the tree limb C by walking backward at a constant speed of 1.1 m/s. find out the speed at which the boy is being lifted at the instant x_A = 4 {rm m}.
The normal airflow over the Rocky Mountains is west to east. The air loses much of its moisture content and is chilled as it climbs the western side of the mountains. What is its temperature at the end of the descent
A certain car is capable of accelerating at a rate of 0.63 m/s2. How long does it take for this car to go from a speed of 56 mi/h to a speed of 60 mi/h.
Three point charges, Q1, Q2, and Q3, are located in the xy- plane. Q1 is -5.580E-6 C and is located at the origin; Q2 is 4.230E-6 C, Calculate the total electrostatic potential energy
How the system comes to thermal equilibrium
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