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A closed hollow sphere of radius R=60.0cm (the surface area of asphere of radius R is 4πR^2) is made of styrofoam havingthermal conductivity k=0.0450 watt/m celsius, A 250 Watt heater isinside the hollow sphere at the center, and it maintains the insideof the box at a constant 40.0 celsius, while the outside of the boxis at 25.0 celsius. The system is in thermal equilibrium, with heatflowing uniformly out of the entire surface of the sphere.
find the thickness(assumed uniform) of the styrofoam wall of thehollow sphere.
Two converging lenses which have focal lengths of +3.0 cm and +2.0 cm are 10 cm away from each other. find the height of the image formed by the seconds lens
A whale swims due east for a distance of 1.5 km, turns around and goes due west for 5.7 km, and finally turns around again and heads 4.5 km due east. What is the total distance traveled by the whale
A standing wave in a pipe with both ends open has a frequency of 444 Hz. The next higher harmonic has a frequency of 602 Hz. Determine the fundamental frequency. How long is the pipe?
A solid metal sphere with radius 0.590m carries a net charge of 0.300 nC. Find the magnitude of the electric field ata point 0.100 m outside the surface of the sphere.
The planet Uranus has a satellite, Ariel, which travels in an orbit of radius 1.910×108 m with a period of 2.52 days. Calculate the mass of Uranus from this information
suppose a 30 gram piece of iron is dropped into a container of water and gives off 165 calories in cooling. calculate
An empty capacitor is capable of storing 1.0 × 10-4 J of energy when connected to a certain battery. If the distance between the plates is halved and then filled with a dielectric, how much energy could this modified capacitor store when connected..
A charged particle is injected at 135 m/s into a 0.0713-T uniform magnetic magnetic field perpendicularly to the field. What is the charge-to-mass ratio of this particle
Some asteroid fragments are large enough to not completely burn up in the atmosphere and they end up on the surface of the Earth. how could you determine which type of radiation was being emitted
a standing wave oscillating on a string at frequency f_0. How many antinodes will there be if the frequency is increased to 3f_0
A 31.5 cm focal length converging lens is 20.0 cm behind a diverging lens. Parallel light strikes the diverging lens. What is the focal length of the diverging lens
An alpha particle approaches a 197 AU nucleus with a speed of1.5x10^7 m/s. In what direction does the nucleus recoil, and with what speed
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