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?

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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.

Physics & Space Science

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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

Physics & Space Science

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

Physics & Space Science

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?

Physics & Space Science

A holographic plate produces an image for the viewer that is:

A. real B. virtual C. may be either virtual or real

Physics & Space Science