What evidence is there to prove that there has been no tectonic movement on Mars?
a. The meteorites that have landed on Earth
b. The "blueberries" found by rover Opportunity
c. The huge size of the Martian volcanoes
d. The presence of ice beneath the surface
e. The large number of polygonal cracks on the surface
c
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Why wasn't the intracluster medium in galaxy clusters discovered until the 1960s?
A) We did not know how much dark matter existed before then. B) We didn't have the resolution to observe galaxy clusters until then. C) The Milky Way was blocking our view of distant galaxy clusters. D) The medium emits X-rays, which are blocked by the Earth's atmosphere and require X-ray satellites in space in order to be observed. E) Radiation emitted by the medium was so dim that we couldn't detect it until we built much larger telescopes.
At a depth of 1030 m in Lake Baikal (a fresh water lake in Siberia), the pressure has increased by 100 atmospheres (to about 107 N/m2)
By what volume has 1.0 m3 of water from the surface of the lake been compressed if it is forced down to this depth? The bulk modulus of water is 2.3 × 109 Pa. A) 5.3 × 10-3 m3 B) 4.3 × 10-3 m3 C) 2.3 × 10-3 m3 D) 3.3 × 10-3 m3
A solid non-conducting sphere of radius R carries a charge Q distributed uniformly throughout its volume. At a radius r (r < R) from the center of the sphere the electric field has a value E
If the same charge Q were distributed uniformly throughout a sphere of radius 2R the magnitude of the electric field at a radius r would be equal to A) E/8. B) E/2. C) 2E. D) 8E. E) E.
You're in a fast-moving train traveling at constant velocity. If you jump straight up you land
A) slightly ahead of your original position. B) at your original position. C) slightly behind your original position.