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# What was the minimum speed at which the propellant

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Unformatted text preview: the propellant had to be expelled from the engines to lift off the launch pad? Select the closest answer, given to one significant figure. If there is just enough thrust to lift off, The rate at which propellant is burned is so (d) [4pt] At what minimum speed must a roller coaster car go into the bottom of a circular loop of radius to make it to the top without falling off, assuming the car is not attached to the track? If the car is just barely in contact with the track at the top, the normal force is zero, and gravity alone provided the centripetal acceleration, so . Neglecting friction, the speed at the bottom needed to arrive at the top with this speed is determined by energy conservation: so that...
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