Mathematics, 07.10.2020 16:01 glendaward8233

Suppose y is a positive integer. If x- (-y) = z, will z be greater than or less than x?

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Mathematics, 21.06.2019 21:30

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Mathematics, 21.06.2019 21:40

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Mathematics, 22.06.2019 00:00

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?