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Anton [14]
4 years ago
14

Some help please physics

Physics
2 answers:
salantis [7]4 years ago
3 0
My best guess is A  There is missing a time unit in the question.  I know that 4.4 *5 = 21 so that would be my best guess.
REY [17]4 years ago
3 0
The car's AVERAGE speed is (21/2)=10.5 m/s. (Zero at the beginning, 21 at the end.). In order to cover 50m at an average speed of 10.5 m/s, it takes (50/10.5)=4.76 seconds. It took 4.76 seconds to accelerate to 21 m/s^2, so the average acceleration is (21/4.76)=4.2 seconds. You probably had a formula in class that would take you to 4.4, but this is the way I think it through without a lot of formulas.
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Answer:

740, mm of Hg

Explanation:

The pressure of argon , in mm of Hg = difference in the level of mercury on either side of the manometer.

mercury column  in the open end of the manometer is 22 mm below that in the side connected to the argon and 762 mmHg,  end is open to atmospheric pressure.

therefore, The pressure of argon , in mm of Hg  =762 -22 = 740, mm of Hg

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