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A physicist uses a cylindrical metal can 0.210m high and 0.075m in diameter to store liquid helium at 4.22 K; at that temperature the heat of vaporization of helium is 2.09×104J/kg. Completely surrounding the metal can are walls maintained at the temperature of liquid nitrogen, 77.3 K, with vacuum between the can and the surrounding walls.
How much helium is lost per hour? The emissivity of the metal can is 0.200. The only heat transfer between the metal can and the surrounding walls is by radiation.
If a four-engine jet accelerates down the runway at 2 m/s2 and one of the jet engines fails, explain how much acceleration will the other three produce?
a fly beats its wings at a frequency of 1200 Hz. if the expansion and contraction of the wing muscles of the fly exhibits simple harmonic motion, what is the time period of a single beat of the flys wings
Questions on blackbody, Infra-Red Detectors & Optic Lens and Digital Image.
What must the charge (sign and magnitude) of a particle of mass 1.42g be for it to remain stationary when placed in a downward-directed electric field of magnitude 610N/C ? Use 9.81m/s^2 for the magnitude
A charge of -2.95 µC is fixed at the center of a compass, What are the magnitude and direction of the net electrostatic force acting on the charge at the center
A hollow metal sphere has 6 cm and 10 cm inner and outer radii, respectively, What are the strength and direction of the electric fi eld at points 4, 8, and 12 cm from the centre
A firefighting crew uses a water cannon that shoots water at 29.0m at a fixed angle of 52.0 degrees above the horizontal. How far from the building should they position their cannon
An experimental measurement has a result 7.95 +- 0.01, and a predicted value of 8.00. What is the percent uncertainty in the measurement
A loop of diameter 15 cm is placed in a uniform electric field of magnitude 6.0 102 N/C. (a) What is the electric flux through the loop when the electric field is perpendicular to the plane of the loop? N·m2/C.
Using energy considerations, compute the average force the beam exerts on the pile driver while the pile driver is brought to rest.
What is the minimum frequency of light needed to free an electron from a neon nucleus when the electron is in its lowest energy level n=1
A disk of radius R and unifrom surface charge density sigma spins with angular velocity Omega about the y-axis. Find its magnetic dipole moment.
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