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polet [3.4K]
3 years ago
11

In a classroom experiment, a student rubs a comb against her hair. The comb is then brought near bits of paper resting on a surf

ace. Which of these can be concluded if the comb picks up the bits of paper?
Physics
1 answer:
Harlamova29_29 [7]3 years ago
5 0

Answer:

The comb was positively charged, and it attracted a negatively charged object.

An example of static electricity.

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Answer:

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In anticipation of a long 10 upgrade, a bus driver accelerates at a constant rate of 5 ft/s2 while still on a level section of a
fgiga [73]

Answer:

S = 20903.4 ft

Explanation:

First we will determine the acceleration of the bus while it is moving upward

The equilibrium  equation would be

F - W sin\theta = ma'\\ma - W sin\theta = ma'\\m = \frac{W}{g} \\\frac{W}{g}*a - W sin\theta = \frac{W}{g} * a'\\\frac{a}{g} - sin\theta = \frac{a'}{g}\\\frac{x}{y} \frac{5}{32.2} - sin 10 = \frac{a'}{32.2} \\\a' = -0.59

Let the displacement be S_0

As per newton's third law of motion

v^2 -u^2 = 2as\\u = 80 \frac{mi}{h} =   117.33\frac{ft}{s}\\v = 50 \frac{mi}{h} =   73.33\frac{ft}{s}\\73.33 ^ 2 - 117.33^2 =  2 * (-0.59) * (S-S_0)\\\\S_0 = 0\\S = 20903.4

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