What, other than its existence, is unusual about the magnetic field of Mercury?
What will be an ideal response?
It is still being generated, through an unknown process, and is significantly offset from the planet's center.
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A bolt of lightning strikes the ground 200 m from a 100-turn coil oriented vertically and with the plane of the coil pointing toward the lightning strike. The radius of the coil is 0.800 m and the current in the lightning bolt falls from 6.02 × 106 A to zero in 10.5 ?s. What is the voltage induced in the coil over this time period? [A question for future electrical engineers: is there any way
to get lightning to strike repeatedly at the same point?]
?
When an atom absorbs energy, it becomes excited.
Answer the following statement true (T) or false (F)
Mort, who is standing on the ground, throws a ball at 20 m/s eastward as measured by him. What is the ball's velocity relative to Velma, who is in a train moving eastward past Mort at 70 m/s?
A) 50 m/s eastward B) 90 m/s eastward C) 50 m/s westward D) 90 m/s westward E) 70 m/s westward
Escape speed from Earth is
A) 8 km/s. B) 9.8 km/s. C) 11.2 km/s. D) 42.2 km/s.