Is it likely that dark matter is not actually responsible for the acceleration of the Universe, and that the problem actually is with our understanding of gravity?
What will be an ideal response?
No. Scientists understand gravity very well. Also dark matter and dark energy work very well as the simplest model.
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As a parcel of air at high altitude sinks to a lower elevation with no heat input or output, its temperature
A) increases. B) decreases. C) will remain unchanged.
In the context of understanding stellar lives, "high-mass" stars have masses
A) more than about 8 times the mass of our Sun. B) more than about 3 times the mass of our Sun. C) the same as our Sun. D) more than about 100 times the mass of our Sun.
LC Circuits: A simple series circuit consists of just a 3.4-µF capacitor and an 80-mH inductor, with no appreciable resistance. At t = 0 the capacitor has charge 5.4 µC and the current in the inductor is zero.(a) How long after t = 0 will the current in the circuit be maximum?(b) What will be this maximum current?
What will be an ideal response?
Suppose you know the speed of a spacecraft in kilometers per second. How would you calculate its speed in kilometers per hour?
A) Multiply by 60 and then multiply by 60 again. B) Divide by 60 and then divide by 60 again. C) Multiply by 24. D) Divide by 24.