
Mathematics, 24.02.2019 01:49
Adecorative pillow is in the shape of a parallelogram. it's base is 28 centimeters, and it's height is 24.5 centimeters. what is the area of the front surface of the pillow.β

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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 aβ rocket's maximum velocity v in kilometers per second is vequalsminus0.0098tplusc ln upper rβ, where t is the firing time inβ seconds, c is the velocity of the exhaust in kilometers perβ 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 20β, an exhaust velocity of 2.1 βkm/s, and a firing time of 15 s. can the spacecraft achieve a stable orbit 300 km aboveβ earth?
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Adecorative pillow is in the shape of a parallelogram. it's base is 28 centimeters, and it's height...
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