An open box-car has a mass of 30,000 kg and is moving on a level railroad track at 4.00 m/s. 1,000 kg of water falls straight down into the box-car. The velocity of the box-car after the water falls into the box- car is
A. 7.01 m/s.
B. 6.55 m/s.
C. 5.02 m/s.
D. 3.87 m/s.
E. 2.89 m/s.
D. 3.87 m/s.
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Convection currents in the ______causes lithospheric plates to move across the Earth's surface.
Fill in the blank(s) with the appropriate word(s).
Except for hydrogen, helium, and a little lithium, the lower-mass elements (lighter than iron) that are spread throughout the dust of the universe were created
A) during the shock of a supernova explosion. B) during the fusion process that powers the stars, and then released in supernova explosions. C) in hot white dwarf stars. D) in the original creation of the universe. E) in Kansas.
What role does the main sequence mass of the star play in the formation of heavy elements in the giant stage?
What will be an ideal response?
A tube of mercury with resistivity 9.84 × 10-7 ? ? m has an electric field inside the column of mercury of magnitude 23 N/C that is directed along the length of the tube
How much current is flowing through this tube if its diameter is 1.0 mm? A) 180 A B) 29 A C) 18 A D) 280 A