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3 cards from this section. Quick, good the night before a test.
What does mass conservation imply in a fluid system?
Think about how fluid flows in and out of a container.
Define momentum in your own words.
Consider how fast an object is moving and how heavy it is.
What does the mass conservation principle state?
Relate it to fluid flowing in and out of a system.
True or False: Momentum is conserved in a closed system.
Think about Newton's laws.
A water jet with a cross-sectional area of 10 cm² and velocity of 25 m/s strikes a flat plate. Calculate the force exerted if the density of water is 1000 kg/m³.
Use the formula for mass flow rate and then apply it to find the force.
A spacecraft has a mass of 20000 kg and is descending at 400 m/s. If it expels gas at 75 kg/s with a velocity of 3000 m/s relative to itself, calculate the thrust and acceleration.
Use the thrust calculation to determine how quickly the spacecraft decelerates.
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