3 years ago

What is the mass of 4.2 x 10^22 atoms of phosphorus

Physics

1 answer:

mina [271]3 years ago

7 0

Answer:

2.16

Explanation:

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Two trains are traveling on the same track and in the same direction. The first train, which is behind the second train, blows a

Andrews [41]

Answer:

37.545 m/s

Explanation:

f' = Actual frequency of horn = 269 Hz

f = Observed frequency of horn = 290 Hz

v = Speed of sound in air = 343 m/s

$v_0$ = Speed of second train = 13.7 m/s

$v_s$ = Speed of first train

From Doppler effect we have

$f=f'\dfrac{v-v_0}{v-v_s}\\\Rightarrow v_s=v-\dfrac{f'}{f}(v-v_0)\\\Rightarrow v_s=343-\dfrac{269}{290}(343-13.7)\\\Rightarrow v_s=37.545\ m/s$

The speed of the first train is 37.545 m/s

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3 years ago

How many work is done when a force of 33n pulls wagon 13meters

goldenfox [79]

Work = force x distance
$13 \times 33 = 429$
the answer is 429 joules

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3 years ago

If you can simply pour sand into a cup then why is it not a liquid?

sleet_krkn [62]

If you, for example, poured it onto a wide cup with a volume equal to the total volume of the sand particles, the sand would not spread out to fill the container but would bunch up together in the middle.

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4 years ago

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frosja888 [35]

B, refraction I believe.

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