Hermes has a rotating wheel, or centrifuge, to provide artificial gravity for the crew. Spaceships in “2001: A Space Odyssey” and “Mission to Mars” were similarly equipped. Although it is not shown in the film, the astronauts would have used a Mars descent vehicle (MDV) to get down from Hermes to the surface.
The efficiency of a machine is the ratio between the output power and the power in input:

in our problem, the output power is 3760 W while the input power is 4000 W, so the efficiency is

So the efficiency of the machine is 94%.
Answer:

Explanation:
Given:
- mass of skier,

- initial velocity of skier,

- height of the hill,

- spring constant,

<u>final velocity of skier before coming in contact of spring:</u>
Using eq. of motion:



<u>Now the time taken by the skier to reach down:</u>



<u>Now we calculate force using Newton's second law:</u>




<u>∴Compression in spring before the skier momentarily comes to rest:</u>




Answer:

Explanation:
(2.2500x10^3) x (3.00 x10^5)
First add the power values since all are to power 10 hence this will be 3+5=8
Then multiply the digit intergers ie 2.25*3=6.75
Therefore, in scientific notation this will be represented as 