Transits of Venus were critical in early determinations of the A.U
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TRUE
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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 mT. 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.
An object is in free fall as soon as it is released, whether it is dropped from rest, thrown downward, or thrown upward
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Density: The average density of blood is 1.06 × 103 kg/m3. If you donate a pint of blood to the Red Cross, how many grams of blood have you donated? (2.00 pt = 1.00 qt, 1.00 L = 1000 cm3, 1.00 qt = 0.947 L, and density is mass per unit volume.)
A. 502 g B. 0.502 g C. 5020 g D. 5.02 × 105 g E. 5.02 g
A spring with a spring constant of 8.0 N/m is compressed to 20 cm. If the spring is uncompressed initially, then the work done is
A. 0.12 J. B. 0.16 J. C. 0.19 J. D. 0.22 J. E. 0.26 J.