Statistics for Launching into Space

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General Stats

This quiz has been taken 8 times
The average score is 9 of 31

Answer Stats

Question	Answer	% Correct
What are the two most used states of propellant?	Liquid	83%
	Solid	83%
What is the name for the velocity required to escape a planet's gravitational field?	Escape Velocity	67%
Who theorised that if an object was thrown fast enough it would go into a permanent orbit?	Isaac Newton	67%
Along with the fuel, what must a rocket store for the engines to work?	Oxygen supply	67%
What force provides the gradual upward lift needed for a rocket to launch?	Thrust	67%
In the absence of air resistance and other external factors, what is the trajectory of an object's shape?	A parabola	50%
Who discovered that gravity actually makes all objects fall at the same rate?	Galileo Galilei	50%
Although upwards thrust is constant, the acceleration of the rocket is never 100% and never constant either. What mass is decreasing which causes this to happen?	The fuel's mass is burning away	50%
Since gravity also decreases as the rocket rises, what is the overall effect over time on the rocket's acceleration during its full launch?	It increases	33%
If friction and other external forces didn't exist, when would an onject cease its horizontal motion?	Never	33%
Which of Newton's Law's of Motion explain why a force of propelled gases downward force the rocket upwards?	The third law	33%
When in free-fall, what is the value of g forces experienced?	Zero	33%
g forces are calculated using a division equation, normal true weight is the denominator. What is the numerator?	Apparent weight	17%
What calculation is used to calculate acceleration in terms of final velocity, initial velocity and time?	a=(v-u)/t	17%
a=9.8m/s^2 ____ (because it is a vector).	down	17%
Projectile motion, according to Galileo, has two separate and independant motions that superimpose each other, what are these two motions? (They are perpendicular)	Horizontal motion	17%
How do you calulate apparent weight?	mg+ma	17%
Using simple maths, if an object is rising, its g force value will always be greater than what?	One	17%
The last is in terms of r...	r=ut+1/2at^2	17%
The equation: Escape velocity = 2Gm(planet)/r(planet) is wrong. What is the right hand side missing?	Square root	17%
Therefore, when using the above equations for horizontal trajectory only, what single term does u (initial velocity) equal?	v	17%
The second is in terms of v^2 (final velocity squared)... and r=displacement	v^2=u^2+2ar	17%
	Vertical motion	17%
What other three equations with 'a' can you use to find values for projectile motion? The first is in terms of final velocity (v)...	v=u+at	17%
The force of thrust must be greater than what other force before a rocket can lift off.	Weight	17%
What direction would the object travel if the value of g forces was below this number?	Downwards	0%
When dividing this equation by true weight, ma, the mass values cancel out leaving what equation?	(g+a)/g	0%
What kind of increase does the velocity have?	Logarithmic	0%
What types of rockets avoid excessive peaks in g forces?	Multi-stage rockets	0%
The direction of what can be exploited to gain a boost in velocity when trying to reach orbit?	The Earth's rotation	0%