1- solar sails are one method of gaining thrust in outer space. the sail essenti

Question

1- solar sails are one method of gaining thrust in outer space. the sail essentially is pushed by sunlight. it is estimated that you could reach Neptune in 8.5 years. Neptune is our outermost planet at 4.35*10^12 m from earth. what force is being generated on a 2000kg spacecarft by the sail? assume the acceleration is constant for the trip.

2- squids rely on jet propulsion, vesatile technique to move around in water. A 1.5 kg sqiud at rest suddenly expels 0.10 kg of water backward to quickly get itself moving forward at 3.5 m/s. if we neglect external forces(like drag) what is the speed with which the squid expels the water?

Explanation / Answer

Apply the law of cosnervation of the linear momentum.

pi=pf

0=mu+(M-m)v

u= - (M-m)*v / m = - (1.5 - 0.10)* 3.5 / (0.10)

= - 49 m/s.

The answer is 49 m/s.

Negative sign indicatees that the direction of the water is opposite to the sqiud.

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