PHYSICS CHALLENGE QUESTION 4 SOLUTIONS PART 1 IT TAKES

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Physics Challenge Question 1: Solutions

Physics Challenge Question 4: Solutions

Part 1:

It takes it 5 minutes (300 s) to change its speed from 0 to 10 km/s. The average acceleration is just the rate at which the speed changed:

PHYSICS CHALLENGE QUESTION 4 SOLUTIONS PART 1 IT TAKES

Part 2:

Its initial velocity was 0, so that means its displacement (d) must be:

So, after burning its fuel, the rocket is about 1500 km above Earth.

Part 3:

We’ll neglect the first five minutes (compared to the distance to the Moon, 1500 km is not very much!)

This is then just a constant velocity problem:

This very fast rocket only takes about half a day to reach the Moon. The real rockets that flew to the Moon were a little slower, but still made it there in a few days. The Moon is close!!

Part 4:

Let’s calculate the time it takes to get for our rocket to reach A. Centauri:

Even in our fast rocket, it would take approximately 130,000 years! This is a real problem for NASA when considering interstellar travels!

Part 5:

Assume it burns its rockets the whole way there and find the travel time:

PHYSICS CHALLENGE QUESTION 4 SOLUTIONS PART 1 IT TAKES

So he makes it there in time (the other rocket still had 5.5 hrs to go).

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