Why doesn’t the melting of ocean-based ice raise as much concern and the melting of land-based ice?
1.Unlike land-based ice, ocean-based ice already displaces water, so when it melts ocean levels won’t change much.
2.Because ocean-based ice is in the oceans, it will affect the level of the oceans much more than land-based ice.
3.Both ocean-based ice and land-based ice raise the same level of concern.
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Which of the following statements is not true of the object known as Sgr A* in the center of our Galaxy?
A) It is by far the brightest source of visible light lying in the direction of the galactic center. B) It is thought to harbor a black hole of more than 3 million solar masses. C) It is a source of bright radio emission. D) It is a source of X-ray emission that we have observed with telescopes in space.
Charge of uniform density 90 nC/m3 is distributed throughout the inside of a long nonconducting cylindrical rod (radius = 2.0 cm). Determine the magnitude of the potential difference of point A (2.0 cm from the axis of the rod) and point B (4.0 cm from the axis)
a. 1.9 V b. 1.4 V c. 2.2 V d. 2.8 V e. 4.0 V
A solenoid with n1 = 1200 turns/m and a current I1 = 2.5 A is filled with a paramagnetic material at a temperature T1 = 320 K
A second solenoid with n2 = 1000 turns/m and a current I2 = 0.85 A is filled with the same paramagnetic material at a different temperature T2. The magnetizations are the same in both cases. What is the value of T2? A) 256 K B) 150 K C) 67 K D) 91 K E) 201 K
The first successful landers on the surface of Mars were:
A) Mariners 4 and 5 in 1965. B) Vikings 1 and 2 in 1976. C) Voyagers 1 and 2 in 1979. D) Pathfinder and Sojourner in 1997. E) Spirit and Opportunity in 2004.