Question

4. Why are spaceships provided with heat shield ?
5. Why are the bodies of boats, ships, aeroplanes etc made streamlined ?
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Answer 1

Explanation:

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Answer 2

Answer:

4)Heat shields are essentially used as the brakes to stop spacecraft burning up and crashing on entry and re-entry into a planet's atmosphere. ... Planets with atmospheres, such as Earth and Mars, allow spacecraft to utilise aerodynamic drag to slow down and the prototype's design uses this to enable atmospheric entry.

5)The aeroplanes and ships have streamlined shaped bodies to reduce drag. The streamlined shaped body experiences minimum resistance when travelling through water or air. It helps to reduce friction.

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