Chapter 13, Problem 096 Elving Cirous of Physics In his 1865 science fiction nov

Question

Chapter 13, Problem 096 Elving Cirous of Physics In his 1865 science fiction novel From the Earth to the Moon, Jules Verne described how three astronauts are shot to the Moon by means of a huge gun. According to Verne, the aluminum capsule containing the astronauts is accelerated by ignition of nitrocellulose to a speed of 11 km/s along the gun barres length of 220 m. (a) In g units, what is the average acceleration of the capsule and astronauts in the gun barrel? (b) Is that acceleration tolerable or deadly to the astronauts? A modern version of such gun-launched spacecraft (although without passengers) has been proposed. In this modern verslon, called the SHARP (Super High Altitude Research Project) gun, ignition of methane and air shoves a piston down the gun's tube, compressing hydrogen gas that then launches a rocket. During this launch, the rocket moves 3.5 km and reaches a speed of 7.0 kmys. Once launched, the rocket can be fired to gain additional speed. (c) In g units, what would be the average acceleration of the rocket within the launcher? (d) How much additional speed is needed (via the rocket engine) if the rocket is to orbit Earth at an alititude of 700 km? (a) Number Units Units (c) Number (d) Number Click if you would like to Show Work for this question: Oen Show.Work Units

Explanation / Answer

a)

vo = initial velocity = 0 m/s

vf = final velocity = 11 km/s = 11000 m/s

d = distance travelled = 220 m

a = acceleration

using the equation

vf2 = vo2 + 2 a d

(11000)2 = (0)2 + 2 a (220)

a = 275000 m/s2

g = 10

so a = 27500 g

b)

deadly

c)

c)

vo = initial velocity = 0 m/s

vf = final velocity = 7 km/s = 7000 m/s

d = distance travelled = 3.5 km = 3500 m  

a = acceleration

using the equation

vf2 = vo2 + 2 a d

(7000)2 = (0)2 + 2 a (3500)

a =7000 m/s2

g = 10

so a = 700 g

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