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(a) If two sound waves, one in air and one in (fresh) water are equal in intensity, what is the ratio of the pressure amplitude of the wave in water to that of the wave in air? Assume the water and the air are at 20°C.
(b) If the pressure amplitudes are equal instead, what is the ratio of the intensities of the waves?
A boat has a mass of 4710 kg. Its engines generate a drive force of 3610 N due west, What is the boat's acceleration, with correct sign
A spherical weather balloon is filled with hydrogen until its radius is 3.40 m. Its total mass including the instruments it carries is 10.0 kg. Find the buoyant force acting on the balloon
Water flows at 0.990m/s from a hot water heater, through a 450-kPa pressure regulator. What is the flow speed in this pipe
A 5 kg block is placed near the top of a frictionless ramp, which makes an angle of 30o degrees to the horizontal. Find the maximum compression of the spring
Kahlinium is an H-like atom consisting of an electron and the positive Casimir particle, what would be the wavelength of the first line of the Lyman emission series for this atom
Calculate the adiabatic flame temperature attained when methane at 298k, is combusted (a) with oxygen in the molar ratio air/CH4 = 9.524. Assume that CO2 and H2O are the products of the combustion. The adiabatic flame temperature is that temperature ..
A typical compact disc stores information in tiny pits on the disc's surface. What's the frequency of electromagnetic waves that have a wavelength equal to the typical CD pit size
The red line of the Balmer series in hydrogen (? = 656.3 nm) is observed to split into three different spectral lines with ?? = 0.07 nm between two adjacent lines when placed in a magnetic field B. What is the value of B if ?? is due to the energy sp..
When a particular inductor is connected to a sinusoidal voltage with a 245 V amplitude, a peak current of 7.9 A appears in the inductor. What is the maximum current if the fre- quency of the applied voltage is doubled? Answer in units of A. b.)What i..
What is the total charge of the uranium nucleus? (The neutral uranium atom has 92 electrons.), What is the magnitude of its electric field at a distance of 1.48×10-10 m from the nucleus
A 5.4-µC point charge is located at x = 0.9 m, y = 3.3 m, and a -3.9-µC point charge is located at x = 1.9 m, y = -1.9 m. (a) Find the magnitude and direction of the electric field at x = -3.2 m, y = 0.9 m.' (b) Find the magnitude and direction of..
A simple generator has a 620-loop square coil 21cm on a side. How fast must it turn in the 0.690 T field to produce a 140 V peak output.
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