The _____ is an anticoded message, meaning that it is intended to be decoded by beings about whom we know nothing except that they build radio telescopes
A) Cosmic Call
B) Wow! signal
C) Morse code
D) Arecibo beacon
D
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Which of the following is not a major idea of Einstein's general theory of relativity?
A) It is possible to travel through wormholes. B) Time runs slower near strong gravitational fields. C) Our universe can have no center or boundaries, yet be finite. D) Black holes can exist in spacetime, and falling into a black hole means leaving the observable universe. E) Large masses that undergo rapid changes in motion or structure can emit gravitational waves that travel at the speed of light.
If you were to come back to Earth in 150 million year's time, what would a map of the planet look like compared to today?
A) so completely different that none of our current continents would be recognizable B) only slightly different because plate motion is extremely slow C) exactly the same because plate tectonics is no longer occurring D) quite different because plate tectonics would have caused a shift in the position of the continents
What does escape velocity measure?
A. how fast an object needs to go to escape hostile space aliens B. how fast an object needs to go to escape a planet's gravity C. how far away an object needs to be to escape a planet's gravity D. the gravitational attraction at a planet's surface
A 20-m long steel wire (cross-section 1.0 cm2, Young's modulus 2.0 × 10^11 N/m2), is subjected to a load of 25 000 N. How much will the wire stretch under the load?
a. 0.25 cm b. 2.5 cm c. 12.5 cm d. 25 cm e. 1.25 cm