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A sound source of 500 Hz with an acoustic power of 1/10 of a watt how do you find the intensity 1/2 a m from the source, the pressure amplitude, and the magnitude of the specific acoustic impedance
Calculate the rate of heat transfer between the turbine and the surroundings . note the relative magnitudes of the kinetic energy and enthalpy change.
Calculate the heat transferred for the decomposition of 53 gof ammonium dichromate according to the following equation.(NH4)2Cr2O7 -->N2 + 4H2O +Cr2O3 &
How much heat is transferred when 100 g of calcium oxide (CaO)reacts with carbon according to the equation below? Is this reaction endothermic or exothermic?CaO + 3C --> CaC2 +CO &nbs
A vanadium electrode is oxidized electrically. If the mass ofthe electrode decreases by 114 mg during the passage of 650 coulombs, what is the oxidation state of the vanadium product?
A hypothetical element has 2 main isotopes. One has a mass of 56 amu and the other has a mass of 58 amu. If the atomic weight of this element is 56.73 amu, what is the percent abundance
Now consider the core to be surrounded by a cladding material with an index of refaction of n=1.30. What is the maximum angle θ, that light can enter the fiber and be trapped by total internal
The reaction of 9.6 grams of fluorine with excess chlorine produced 3.2 grams of ClF3. What percent yield of ClF3 was obtained?
In the Bohr model of the hydrogen atom, an electron moves in a circular path around a proton. The speed of the electron is approximately 2.46 x 106 m/s. (a) Find the force acting on the electron as
A person stands on a scale in an elevator. As the elevator starts, the scale has a constant reading of 598 N. As the elevator later stops, the scale reading is 392 N. Assume the magnitude of the ac
A balloon containing 5.7 dm3 ofgas at 14°C and 100.0 kPa rises to an altitude of 2000 m, wherethe temperature is 20°C. The pressure of gas in the balloon isnow 80.0 kPa. What is the vol
Consider light that is refracted by a prism shaped like an equilateral triangle. The incident ray is parallel with the prism's base. what is the total deflection of the ray, given that the index of
A 6300-kg satellite is in a circular earth orbit that has a radius of 3.0 x 107 m. A net external force must act on the satellite to make it change to a circular orbit that has a radius of 8.3 x 106 m
Briedfly describe the model for the mechanism by which atomsabsorb light energy. Then indicate how the moel is related to thefact that atoms absorb energy of only specific quanta.
A proton is fired from far away toward the nucleus of a mercury atom. Mercury is element no.80. If the initial velocity of the proton is 4 x 107 m/s, what is the distance of closet approaching to th
Even if a cospotted TLC analysis of an unknown with an authentic standard is performed, one still does not know with complete certainity that the unknown and the standard are identical.
In being launched from rest it moves through a distance of 87 m and has a kinetic energy of 5.00 107 J at lift-off. What is the work done on the jet by the catapult?
A chemist wants to prepare 0.42 MHCl. Commercial hydrochloric acid is 12.4 M. How many milliliters of the commercial acid does the chemist require to makeup 1.63 L of the dilute acid?
The vertical component of the Earth's magnetic field at this location has a magnitude of 44µT. What is the magnitude of the induced emf between the ends of the beam?
Bromine is composed of atoms having mass numbers 79 and 81.calculate the % of each isotope, if the atomic number is79.91? What is the proper isotope notation for the bromine isotope 79if it has gai
A 20 x 10-9 C charge is at the origin, and a -10 x 10-9 C is at X = 15 cm. At what point or points on the x-axis is the electric potential zero?
A 47.5 gram sample of a metal at a temperature of 425 degrees C is placed in 1.00 L (1000 g) of water which had an initial temperature of 18 degrees C.
Using the approximate results of part (b), calculate the gradient of the potential along the x axis, and show that thenegative gradient is equal to the x component Ex of the electricfield.
An electron in a hydrogen atom falls from a n=4 level to a lower level, emitting light with a wavelneth of 486 nm. What value of n was the lower level to which the electron fell?
Mass measurement of the crucible, lid, and sample are performed only at room temperature. Why is this technique necessary for a gravimetric analysis?