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zaharov [31]
3 years ago
9

A man walks 30m to the west, then 5m to the east in 45 seconds. What is the average velocity?

Physics
2 answers:
solong [7]3 years ago
8 0
1.28m/s the velocity is found by distance/time.
ryzh [129]3 years ago
6 0
Average speed- (35m/45s)= 7/9 meters per second.
Average velocity-(30w + 5m E) / (45s)= 25 m/s West.
Hope this helps. :)
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A copper cylinder is initially at 21.1 ∘C . At what temperature will its volume be 0.163 % larger than it is at 21.1 ∘C?
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To solve this problem we will apply the concepts related to the final volume of a body after undergoing a thermal expansion. To determine the temperature, we will use the given relationship as well as the theoretical value of the volumetric coefficient of thermal expansion of copper. This is, for example to the initial volume defined as V_1, the relation with the final volume as

V_2 = V_1 +0.163\% V_1

V_2 = V_1 +0.00163V_1

V_2 = 1.00163V_1

Initial temperature = 21.1\°C

Let T be the temperature after expanding by the formula of volume expansion

we have,

V_2 = V_1 (1+\gamma \Delta t)

Where \gamma is the volume coefficient of copper 5.1*10^{-5}/C

1.00163V_1 = V_1(1+\gamma(T-21.1\°))

1.00163 = 1+5.1*10^{-5}(T-21.1\°)

0.00163 = 0.000051T-0.0010761

T = 53.0608\°C

Therefore the temperature is 53.06°C

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