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Two ice skaters, one with mass of 45kg and the other was a mass of 60kg, are moving together at 0.20m/s with the 60kg skater in front. After they have pushed off from one another, the speed of the 60kg skater is 0.257 m/s in the same direction as the original combined-skater velocity. What is the speed of the 75kg skater after they have pushed off?
A GaAs quantum well structure is given where a thin GaAs layer is embedded between AlGaAs layers. Assuming the we can treat the electrons in the GaAs conduction band as being trapped in a 1-D potential well in the x direction,
A soprano saxophone is an open pipe. If all keys are closed, it is approximately 65 cm long. Using 343 m/s as the speed of sound, find the lowest frequency that can be played on the instrument.
An object that is launched straight up from the ground reaches maximum height H and falls straight back down to the ground, Express the average speed over the entire trip as a function of H and T
a plug in an electrical device consists of two metal conductors that are seperated by a distance of 75cm. an electric
Entropy (arrow of time)Why did the universe have such low entropy in the past, resulting in the distinction between past and future and the second law of thermodynamics?
In one type of computer keyboard, each key holds a small metal plate that serves as one plate of a parallel-plate, air-filled capacitor. Calculate the capacitance before the key is depressed
A 52-kg mountain climber, starting from rest climbs a vertical distance of 730m. At the top, she is again at rest. Find her efficiency as a heat engine
In a thin film experiment, a wedge of air is used between two glass plates. how much thicker is the air wedge at the 16th dark fringe than it is at the 6th
The total weight of a wheelbarrow filled with gravel is 120 lb. If the wheel barrow is held on an 18° incline in the position shown, determine the magnitude and direction of
A cylindrical storage tank has a radius of 1.34 m. When filled to a height of 3.74 m, What is the density of the solvent
A mass spring system had k= 55.6 N/m and m=0.41 kg. Find the frequency of its simple harmonic motion
A wheel is rotating about an axis that is in the z-direction. The angular velocity is at , increases linearly with time and is at . We have taken counterclockwise rotation to be positive.
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