What is interstellar reddening and explain how it can be used to map out the distribution of dust in a cloud
What will be an ideal response?
Short wavelength (blue) light passing through a cloud is blocked more than longer (redder) wavelengths by the dust grains. Thus starlight passing through a cloud appears redder than in the absence of a cloud. The amount of reddening can be measured by comparing a star's observed color to that expected for its spectral type. By looking at many stars and measuring the reddening toward each one, a map of the dust distribution can be built up.
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_________corrosion is the dissolution of a metal that occurs when it is electrically connected to a more noble metal in an electrolyte.
Fill in the blank(s) with the appropriate word(s).
During the volcanic eruption of Mt. Pelee in 1902, an incredibly hot "burning cloud" rolled down the mountain and incinerated the town of Saint-Pierre. From the damage done, the temperature in the cloud was estimated at 700°C. If the air temperature
was 20°C and a mole of air is 29 grams, estimate the molecular weight of the gas in the "burning cloud" that made it heavier than the surrounding air. (As a follow-on, estimate the most probable composition of the cloud. Some typical volcanic gases are H2S, SO2, H2SO4, CO2, NO.)
A 500 g lump of clay is dropped onto a 1 kg cart moving at 60 cm/s. The clay is moving at 30 cm/s just before landing on the cart
After the collision, the speed of the cart and clay is closest to:
The weather outside is frightful. The temperature is -22°F. What is the corresponding temperature in the Celsius scale?
A) -12°C B) -20°C C) -35°C D) -30°C E) -22°C