A pulley ,it the same concept is used to raise an elevator
Answer:

Explanation:
Given:
- Distance from the shore,

- distance of house from the shore,

- speed of rowing,

- speed of walking,

<em>For the least amount of time to reach the house one must row at the nearest point on the shore and then walk from there.</em>
<u>Now the time taken to reach the shore:</u>


<u>Time taken in walking to house from the shore:</u>




<u>Therefore total time taken:</u>


Answer:
When a particle or a system of particles move in a system where no external force acts, then the total linear momentum of the particle system remains constant.
Explanation:
Given data:
Total mass of the skateboarder, 
Mass of the friend, 
Initial velocity of the skateboarder, 
Initial velocity of the the friend, 
Let the new velocity of the skateboarder when his friend jumps be
.
From the conservation law of linear momentum,


Winds transfer energy in the form heat from the air to the ground!
Answer:
Magic school bus on ya left! so basically a star is born when like....atoms are like squeezed with enough pressure and kinda squished together, once tht happens the atoms start to fuse together
Explanation: