Ashkon throws a basketball across the court to his teammate. The ball has 57 J of potential energy and 61 J of kinetic energy. W
2 answers:
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Answer: Part 1: Propellant Fraction (MR) = 8.76
Part 2: Propellant Fraction (MR) = 1.63
Explanation: The Ideal Rocket Equation is given by:
Δv =
Where:
is relationship between exhaust velocity and specific impulse
is the porpellant fraction, also written as MR.
The relationship is:
To determine the fraction:
Δv =
Knowing that change in velocity is Δv = 9.6km/s and = 9.81m/s²
<u>Note:</u> Velocity and gravity have different measures, so to cancel them out, transform km in m by multiplying velocity by 10³.
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<u>Part 1</u>: Isp = 450s
ln(MR) =
ln (MR) = 2.17
MR =
MR = 8.76
<u>Part 2:</u> Isp = 2000s
ln (MR) =
ln (MR) = 0.49
MR =
MR = 1.63
Answer:
Speed of comet before collision is
Explanation:
Correction: (As stated after collision comet moves away from moon so velocity of moon and moon and comet must be opposite in direction. as spped of moon after collision is −4.40 × 10^2km/h so that comet's must be 5.740 × 10^3km/h instead of -5.740 × 10^3km/h)
Solution:
Case is considered as partially inelastic collision, by conservation of momentum