This is a pond in the shape of a prism. It is completely full of water.
Colin uses a pump to e...
Mathematics, 31.03.2020 22:05 wdymRachel411
This is a pond in the shape of a prism. It is completely full of water.
Colin uses a pump to empty the pond.
The level goes down by 20 cm in the first 30 minutes.
Work out how many minutes Colin has to wait for
the pond to completely empty.
Answers: 3
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Aspacecraft can attain a stable orbit 300 kilometers above earth if it reaches a velocity of 7.7 kilometers per second. the formula for a rocket's maximum velocity v in kilometers per second is vequalsminus0.0098tplusc ln upper r, where t is the firing time in seconds, c is the velocity of the exhaust in kilometers per second, and r is the ratio of the mass of the rocket filled with fuel to the mass of the rocket without fuel. find the velocity of a spacecraft whose booster rocket has a mass ratio of 20, an exhaust velocity of 2.1 km/s, and a firing time of 15 s. can the spacecraft achieve a stable orbit 300 km above earth?
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