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Liula [17]
3 years ago
11

A book rests on a table, exerting a downward force on the table. the reaction to this force is:

Physics
1 answer:
lapo4ka [179]3 years ago
4 0
The upward force the table exerts on the ground!
Equal and opposite forces.
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Explanation:

The heart rate of the astronaut is 78.5 beats per minute, which means that the time between heart beats is 0.0127 min. This will be the time t measured by the moving observer. The time t' measured by the stationary Earth-based observer is given by

t' = \dfrac{t}{\sqrt{1 - \left(\dfrac{v^2}{c^2}\right)}}

a) If the astronaut is moving at 0.480c, the time t' is

t' = \dfrac{0.0127\:\text{min}}{\sqrt{1 - \left(\dfrac{0.2304c^2}{c^2}\right)}}

\:\:\:\:=0.0145\:\text{min}

This means that time between his heart beats as measured by Earth-based observer is 0.0145 min, which is equivalent to 69.1 beats per minute.

b) At v = 0.940c, the time t' is

t' = \dfrac{0.0127\:\text{min}}{\sqrt{1 - \left(\dfrac{0.8836c^2}{c^2}\right)}}

\:\:\:\:=0.0372\:\text{min}

So at this speed, the astronaut's heart rate is 1/(0.0372 min) or 26.9 beats per minute.

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3 years ago
What is a unit of mass?
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The Democratic Party today is generally considered more liberal than the Republican Party because its members and elected offici
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iogann1982 [59]

Explanation:

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note how the units cancel out, if the units do not cancel out (kg/kg=1) then u did something wrong

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