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hammer [34]
3 years ago
6

A van slows down as it travels up a steep hill. Its speed goes from 20m/s at the bottom of the hill to 12m/s when it reaches the

top 8 seconds later. How far has the van travelled between the bottom and the top of the hill?
Physics
1 answer:
ra1l [238]3 years ago
6 0
The van's AVERAGE speed up the hill is

1/2 (20+12) m/s

= 1/2 (32 m/s)

= 16 m/s.

Traveling for 8 seconds at an average speed of 16 m/s, the van covered

(16 m/s) • (8 sec) = 128 meters .
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Answer:

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m_{alu} = \frac{\rho_{alu}m_{app}}{\rho_{alu} -\rho_{air} }

Put all the values in above equation we get

m_{alu} = \frac{(2700)(4.5)}{2700-1.29}

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Therefore the true weight of the aluminium is m_{alu} = 4.5021 kg

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