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4.0kg of water at 30 C is mixed with 4.0 kg of water at 47 C in a well-insulated container. Estimate the net change in entropy of the system.
A gymnast of mass 59 hangs from a vertical rope attached to the ceiling. You can ignore the weight of the rope and presume that the rope does not stretch. Utilize the value for the acceleration of gravity.
The Big Bang theory states that the beginning of the universe was accompanied by a huge burst of photons. Calculate the peak wavelength of this radiation
In special conditions, it is possible to measure the energy of a gamma-ray photon to 1 part in 10^15. For a photon energy of of 50 keV, estimate the maximum lifetime that could be determined by a direct measurement of the spread of the photon energy.
Consider a bird that flies at an average speed of 10.7m/s and releases energy from its body fat reserves at an average rate of 3.70W, How far will the bird fly before feeding again
At a recent rock concert, a dB meterregistered110dB when placed2.00m in front of a loudspeaker on the stage. What was the power output of the speaker
Two point charges -2Q and +3Q are on the x-axis, -2Q at the origin and +3Q at x = D. Find two points on the x-axis within the vicinity of the charges where the electric potential is zero
the potential difference between two parallel plates is 590 v. an alpha particle with mass of 6.64 10-27 kg and charge
With what tension should a rope with length 3.00m and mass 0.135kg be stretched for transverse waves of frequency 43.0Hz to have a wavelength of 0.720m. What torque does friction exert even as this wheel is slowing down.
A gymnast with mass m1 = 42 kg is on a balance beam that sits on (but is not attached to) two supports. The beam has a mass m2 = 106 kg and length L = 5 m. Each support is 1/3 of the way from each end. at first the gymnast stands at the left end of..
The primary coil of a transformer has N1 = 4.00 102 turns, and its secondary coil has N2 = 1.20 103 turns. If the input voltage across the primary coil is ?v = (140 V) sin ?t, what rms voltage is developed across the secondary coil? V
A parallel plate capacitor has a capacitance of 8.5 µF when filled with a dielectric. What is the dielectric constant of the dielectric
A bicyclist is finishing his repair of a flat tire when a friend rides by with a constant speed of 3.23 m/s. What is his speed when he catches up
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