A spacecraft engine ejects mass at a rate of $30 kg/s$ with an exhaust velocity of $3000 m/s$ . What is the thrust of the engine in vaccum?

90, 000 N

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9000 N

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900000 N

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900 N

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Solution

The correct option is A $90, 000 N$
Given, rate of ejection of mass $\frac{d m}{d t} = μ = 30 kg/s$
and exhaust velocity
$V_{r} = 3000 m/s$
As we know,
$F_{t h r u s t} = V_{r} ∣ ∣ ∣ \frac{d m}{d t} ∣ ∣ ∣$
$F_{t h r u s t} = 3000 \times 30$
$F_{t h r u s t} = 90, 000 N$

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A spacecraft engine ejects mass at a rate of 30 kg/s with an exhaust velocity of 3000 m/s. What is the thrust of the engine in vaccum?

The correct option is A 90,000 NGiven, rate of ejection of massdmdt=μ=30 kg/s and exhaust velocity Vr=3000 m/s As we know, Fthrust=Vr∣∣∣dmdt∣∣∣ Fthrust=3000×30 Fthrust=90,000 N

A spacecraft engine ejects mass at a rate of $30 kg/s$ with an exhaust velocity of $3000 m/s$ . What is the thrust of the engine in vaccum?

The correct option is A $90, 000 N$
Given, rate of ejection of mass $\frac{d m}{d t} = μ = 30 kg/s$
and exhaust velocity
$V_{r} = 3000 m/s$
As we know,
$F_{t h r u s t} = V_{r} ∣ ∣ ∣ \frac{d m}{d t} ∣ ∣ ∣$
$F_{t h r u s t} = 3000 \times 30$
$F_{t h r u s t} = 90, 000 N$