# Statistics for Launching into Space

### General Stats

• This quiz has been taken 6 times
• The average score is 9 of 31

What are the two most used states of propellant?Liquid
80%
Solid
80%
In the absence of air resistance and other external factors, what is the trajectory of an object's shape?A parabola
60%
What is the name for the velocity required to escape a planet's gravitational field?Escape Velocity
60%
Who discovered that gravity actually makes all objects fall at the same rate?Galileo Galilei
60%
Who theorised that if an object was thrown fast enough it would go into a permanent orbit?Isaac Newton
60%
Along with the fuel, what must a rocket store for the engines to work?Oxygen supply
60%
What force provides the gradual upward lift needed for a rocket to launch?Thrust
60%
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
40%
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
40%
g forces are calculated using a division equation, normal true weight is the denominator. What is the numerator?Apparent weight
20%
What calculation is used to calculate acceleration in terms of final velocity, initial velocity and time?a=(v-u)/t
20%
a=9.8m/s^2 ____ (because it is a vector).down
20%
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
20%
How do you calulate apparent weight?mg+ma
20%
If friction and other external forces didn't exist, when would an onject cease its horizontal motion?Never
20%
Using simple maths, if an object is rising, its g force value will always be greater than what?One
20%
The last is in terms of r...r=ut+1/2at^2
20%
The equation: Escape velocity = 2Gm(planet)/r(planet) is wrong. What is the right hand side missing?Square root
20%
Which of Newton's Law's of Motion explain why a force of propelled gases downward force the rocket upwards?The third law
20%
Therefore, when using the above equations for horizontal trajectory only, what single term does u (initial velocity) equal?v
20%
The second is in terms of v^2 (final velocity squared)... and r=displacementv^2=u^2+2ar
20%
Vertical motion
20%
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
20%
The force of thrust must be greater than what other force before a rocket can lift off.Weight
20%
When in free-fall, what is the value of g forces experienced?Zero
20%
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%