1) Which is not a reason why a light bulb becomes dim as it ages? a. As the fila

Question

1)    Which is not a reason why a light bulb becomes dim as it ages?

a.     As the filament vaporizes, matter from the filament collects on the inside of the bulb and prevents some light from escaping.

b.     As the filament vaporizes, its area decreases, causing its resistance to increase.

c.     The length of the filament changes over time due to repeated exposure to high temperatures.

1)    The resistivity of an object depends on

a.     Its length

b.     Its cross-sectional area

c.     The material it is made of

d.     All of the above

Explanation / Answer

1) objecAn t at rest explodes into three pieces of equal mass. One moves East at 20.0 m/s, while a second moves northwest at 15.0 m/s. What is the velocity of the third piece?

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