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Alex777 [14]
3 years ago
15

Help me plz.Show workings​

Physics
2 answers:
Ksenya-84 [330]3 years ago
8 0

This question is a good example of the difference between 'speed' and 'velocity'.  This one is all 'velocity', and you've absolutely gotta keep the directions straight.

The object started out moving forward at 10 m/s.  It ended up moving backward at 2 m/s.  What was the change in its velocity ?

The change was <u>12 m/s backward</u> !  

Momentum = (mass) x (velocity).

Change in momentum = (mass) x (change in velocity)

This change in momentum = (0.1 kg) x (12 m/s backward)

This change in momentum = 1.2 m/s backward  or  <em>1.2 Ns  (B)</em>

ddd [48]3 years ago
3 0
Change in momentum: finial momentum - initial momentum
Momentum = mass * velocity
Mass = 100g, same as 0.1kg
m(v-u) = 0.1(10-2) = 0.1(8)
The answer is 0.8Ns
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3 years ago
An automobile tire having a temperature of
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Answer:

Psm = 30.66 [Psig]

Explanation:

To solve this problem we will use the ideal gas equation, recall that the ideal gas state equation is always worked with absolute values.

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v = specific volume [m^3/kg]

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T = temperature [K]

<u>For the initial state</u>

<u />

P1 = 24 [Psi] + 14.7 = 165.47[kPa] + 101.325 = 266.8 [kPa] (absolute pressure)

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Therefore we can calculate the specific volume:

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As there are no leaks, the mass and volume are conserved, so the volume in the initial state is equal to the volume in the final state.

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3 years ago
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sladkih [1.3K]

Answer:

D

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