The first cells that must have formed on Earth must have been complex single-celled organisms much like the modern yeast
Indicate whether the statement is true or false
False
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If an elephant grows proportionally to twice its height, its weight would be multiplied by about
A) 2. B) 4. C) 6. D) 8. E) none of the above
Cepheid and RR Lyrae variable stars change their brightness by ____
a. atmospheric explosions of hydrogen gas b. internal changes in their fusion processes c. a combination of atmospheric explosions and internal changes d. a combination of atmospheric explosions and physically pulsating e. changing its period between pulses
A toy rocket is launched vertically from ground level at time t = 0 s. The rocket engine provides constant upward acceleration during the burn phase
At the instant of engine burnout, the rocket has risen to 49.0 m and acquired an upward velocity of 60.0m/s The rocket continues to rise with insignificant air resistance in unpowered flight, reaches maximum height, and falls back to the ground. The maximum height reached by the rocket is closest to A) 221 m. B) 209 m. C) 244 m. D) 233 m. E) 256 m.
Einstein's Relativity seems to say that, if Mort and Velma are twins and Velma goes on a trip and then returns, Velma will then be younger than Mort and Mort will be younger than Velma. What is wrong with this reasoning?
A) Nothing is wrong with it. B) The prediction about Velma's observation is not correct, because Velma is accelerated. C) The effects of the theory of relativity cancel out due to Velma's acceleration, so that they are both really the same age when they get back together. D) The prediction about Mort's observation is not correct, because Velma is accelerated. E) What's wrong with this reasoning is that Albert Einstein was a fool and a hothead.