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Strontium-90 is to be used in a radioisotopic thermoelectric generator (RTG) for powering a navigation beacon located in the arctic.
a) How much of the Sr-90 activity is required to generate 50 W of electric power if the conversion efficiency from heat to electricity is 30%? Tip: You must take into account the fact that Sr-90 is in equilibrium with its daughter, Y-90.
b) What is the mass of Sr-90 required?
c) Weight is an important factor in the design of a portable, isotopic heat source. If weight is to be kept at a minimum and if the source is to generate 50 W after 1 year of operation, would there be an advantage to using Po-210 compared to Sr-90?
A force of 15 N applied to a spring stretches it by 4cm. What is the potential energy of the spring in the stretched position
Two identical small insulating balls are suspended byseparate 0.25-m threads that are attached to a common point on theceiling. Each ball has a mass of 8.0 × 10-4 kg.Initially the balls are uncharged and hang straight down.
A member of an aircraft maintenance crew wears protective earplugs that reduce the sound intensity by a factor of 350. When a jet aircraft is taking off.
question a 1100 kg car is moving at a speed of 40.0 ms. a what is kinetic energy of the car? b how much work is
A bicyclist of mass 78 kg putsall his weight on each downward-moving pedal as he pedals up asteep road. determine the magnitude of the maximum torque he exerts
Find what is the capacitance of a capacitor that stores 7 μC of charge on its plates when a voltage of 8.4 Volt is applied between them
Electrons accelerated by a potential dissimilarity of 12.89 V pass during a gas of hydrogen atoms at room temperature. Compute the wavelength of light emitted with the longest possible wavelength
Astronomers discover an exoplanet (a planet of a star other than the Sun) that has an orbital period of 3.85 Earth years in its circular orbit around its sun, Find the radius of the exoplanet\'s orbit
A 10.0 kg block is dragged overa rough, horizontal surface by a 73.0 N force acting at 20.0° above thehorizontal. The block is displaced 4.50 m, and the coefficient of kinetic friction is 0.300.
Light of wavelength 600nm is incedent normally on a surface of area 4 cm^2. Determine the radiation pressure exerted upon the surface
Presume that the range of output frequencies is from 68.5 Hz to 15.7 kHz for a pipe organ. Take 343 m/s for the speed of sound. What is the length (in units of m) of the longest pipe open at both ends and producing sound at its fundamental frequency?
What is specific gravity of this other fluid
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