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A Styrofoam box has a surface areaof 0.84 m2 and a wallthickness of 2.0 cm. The temperature of the inner surface is5.0°C, and the outside temperature is 27°C. If it takes 7.9 h for 5.0 kg of ice to melt in the container,determine the thermal conductivity of the Styrofoam.
W/mK
Three protons are at the vertices of an equilateral triangle 0.800nm on each side. What is the potential energy of this set of charges
The Earth can be approximated as a sphere of uniform density, rotating on its axis once a day. The mass of the Earth is 5.97×1024 kg, the radius of the Earth is 6.38×106 m, and the time of rotation for the Earth is 24.0 hrs.
A violinist is tuning her instrument to concert A (440 Hz ). She plays the note while listening to an electronically generated tone of exactly that frequency, What was the frequency of her violin when she heard the 4.00 beat
A bar of gold measures 0.16 m cross 0.056 m cross 0.049 m. How many gallons of water have the same mass as this bar
A 0.4 kg mass attached to a spring is pulled back horizontally across a table so that the potential energy of the system is increased from zero to 150 J. find the kinetic energy of the system after the mass is released
A boat has a mass of 6800 kg, Its engines generate a drive force of 4100 N, due north, while the wind exerts a force of 800 N, What is the magnitude and direction of the boat's acceleration
A bowling ball (mass= 7.2 kg, radius= 0.14m) and a billiard ball (mass= .44 kg, radius= .028m) may each be treated as uniform spheres. find the magnitude of the maximum gravitational force
A 4.0 kg mess kit sliding on a frictionless surface explodes into two 2.0 kg parts, What is the original speed of the mess kit
How much heat energy can created throughout motion
A 190? resistor is connected to an AC source withE0 = 14V. What is the peak current through the resistor if the emf frequency is 100 Hz
Find chemical potential exactly as a function of temperatureT for the given gas density n=N/S where S is the surface area. Is there Bose-Einstein condensation? Explain your answer.
What was the power of the motor that kept the wheel rotating at 6.5 rev/hr in spite of friction.
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