How is it possible that life cycles of stars are so well understood and tested, even though they can take billions of years to happen?
What will be an ideal response?
Astronomers have observed many, many stars at all different stages of their lives. This makes it possible to assemble a complete sequence of steps and to test theoretical models.
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When a bar magnet is thrust into a coil of copper wire, the coil tends to
A) attract the magnet as it enters. B) repel the magnet as it enters. C) both of these D) neither of these
A hot (85.0°C) lump of metal has a mass of 210 g and a specific heat of 0.250 cal/g/°C. John drops the metal into a 345-g calorimeter containing 95 g of water at 21.3°C. The calorimeter is constructed of a material that has a specific heat of 0.100 cal/ g/°C. When equilibrium is reached, what will be the final temperature? cwater = 1.00 cal/g/°C
a. 35.6°C b. 63.9°C c. 49.6°C d. 39.7°C e. 29.4°C
A holographic plate produces an image for the viewer that is:
A. real B. virtual C. may be either virtual or real
Local climate patterns may involve more rainfall in a cooler world, but also in a warmer world. Why is this not contradictory? Explain
What will be an ideal response?