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 ?T. In N, the force exerted by the Earth's magnetic field on the 25 m-long current is
a. 0.
b. 0.012 N, East.
c. 0.012 N, West.
d. 0.30 N, West.
e. 300 N, East.
d
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A) 1 Mpc B) 2 Mpc C) 3 Mpc D) 4 Mpc
Compound Microscope: The distance between the object to be viewed and the eyepiece of a compound microscope is 18.0 cm. The focal length of its objective lens is 0.80 cm and the eyepiece has a focal length of 2.3 cm. The near-point distance of the person using the microscope is 25.0 cm. What is the magnitude of the total magnification of the microscope if it is designed for minimum eyestrain?
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A karate chop is more effective if one's hand
A) follows through upon impact. B) bounces upon impact. C) extends the time upon impact.