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A gas water heater burns natural gas (methane, CH4). Each gram of natural gas burned yields approximately 13,000 calories of energy. A typical water heater takes in water at about 20oC (68oF) and raises its temperature to 60oC (140oF). A typical “low-flow” shower-head might use around 10L of water per minute (which we can estimate 5L of hot water and 5L of cold water mixed), and a typical shower might last 8 minutes. A liter of water has a mass of 1000g. So, how much natural gas does a typical shower require?.
If you tied the string from the previous problem to a wooden block, What is the minimum volume of wooden block you could use? The density of wood is 600 kg/m3
A closely wound circular coil with a diameter of 4.80 cm has 625 turns and carries a current of 0.540 A. What is the magnetic field at the center of the coil
Three 100 ? resistors are connected as shown in the figure. The maximum power that can safely be delivered to any one resistor is 21.5 W. find the total power delivered to the combination of resistors
A 100000 liter water tower is to be drained. The pump can pull water out of the tank through a circular opening in the tank at a velocity of 10 meters per second
A sample of a radioactive isotope is measured to have an activity of 237.1 mCi. how many nuclei of the isotope are there at this time
When blue light of wavelength 465 nm illuminates a diffraction grating, it produces a 1st order utmost but no 2nd order maximum.
A 1.00 liter bubble of air at the bottom of the Marianas Trench has an inital temperature of about 0C. what is the volume of the bubble as it breaks the surface
A total of 2.99·106 electrons are placed on an initially uncharged wire of length 2.25 m. a) What is the magnitude of the electric field a perpendicular distance of 0.494 m away from the midpoint of the wire? b) What is the magnitude of the accele..
Imagine Punch lives on the Earth at rest. Judy traveling past the earth with a speed of 0.600 c. What is the speed of the rocket seen by Judy in terms of the speed of the light
A doorway acts as a single slit for light that passes through it, but a doorway is much larger than the wavelength of visible light, Estimate the width of the doorway
One mole of an ideal gas does 3000J of work on its surroundings as it expands isothermally to a final pressure of 1.00atm, find the initial volume and the temperature of the gas
A 370-kg sailboat has an acceleration of 0.87 m/s2 at an angle of 64° north of east. Find the magnitude and direction of the net force that acts on the sailboat.
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