On weekends, Danny earns
money by washing cars. He
charges $12 to wash a large
car and...
Mathematics, 12.02.2021 20:50 ikramhamideh
On weekends, Danny earns
money by washing cars. He
charges $12 to wash a large
car and $8 to wash a small
car. What amount of money
will Danny earn in one
weekend if he washes 10
large cars and 15 small cars?
Answers: 2
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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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