In electron capture,
A) a proton turns into a neutron
B) a helium nucleus is ejected
C) a proton turns into an electron
D) a neutron turns into a proton
A
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_____ is the rich solution of organic molecules in Earth's first oceans
A) Organelle soup B) Nuclear soup C) Plasma soup D) Primordial soup
Rate this statement: No force due to Earth's gravity acts on astronauts inside the orbiting space station
A) always true while in orbit B) sometimes true while in orbit C) always false
Which of the following statements about black holes is not true?
A) If we watch a clock fall toward a black hole, we will see it tick slower and slower as it falls towards the black hole. B) The event horizon of a black hole represents a boundary from which nothing can escape. C) If you watch someone else fall into a black hole, you will never see him or her cross the event horizon. However, he or she will fade from view as the light he or she emits becomes more and more redshifted. D) If you fell into a supermassive black hole (so that you could survive the tidal forces), you would experience time to be running normally as you plunged across the event horizon. E) If the Sun magically disappeared and was replaced by a black hole of the same mass, the Earth would soon be sucked into the black hole.
A navigational beacon in deep space broadcasts at a radio frequency of 50 MHz. A spaceship approaches the beacon with a relative velocity of 0.40c. The spaceship passes the beacon and departs from it with a DIFFERENT relative velocity
The beacon signal is now detected at a frequency of 40 MHz. What is the new velocity of the spaceship relative to the beacon? A) 0.24c B) 0.28c C) 0.26c D) 0.20c E) 0.22c