An unusual lightning strike has a vertical portion with a current of −400 a downwards. the earth's magnetic field at that location is parallel to the ground and has a magnitude of 30 μt. calculate, in n, the force exerted by the earth's magnetic field on the 25-m-long current.
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Physics, 21.06.2019 18:10
Scientists use laser range-finding to measure the distance to the moon with great accuracy. a brief laser pulse is fired at the moon, then the time interval is measured until the "echo" is seen by a telescope. a laser beam spreads out as it travels because it diffracts through a circular exit as it leaves the laser. in order for the reflected light to be bright enough to detect, the laser spot on the moon must be no more than 1.0 km in diameter. staying within this diameter is accomplished by using a special large-diameter laser. part a if λ = 540nm , what is the minimum diameter of the circular opening from which the laser beam emerges? the earth-moon distance is 384,000 km. express your answer to two significant figures and include the appropriate units.
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Physics, 21.06.2019 23:00
The roller coaster from problem #1 then tops a second hill at 15.0 m/s, how high is the second hill? 91.5 m 79.2 m 80.0 m 68.5 m
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Physics, 22.06.2019 03:10
Aphysical change is a change in the size, shape,, or stafe of matter true or false
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An unusual lightning strike has a vertical portion with a current of −400 a downwards. the earth's m...
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