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# Tutor profile: Bereket Z.

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Bereket Z.
Physics and Math Major at MIT
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## Questions

### Subject:Geometry

TutorMe
Question:

I think of a shape with n sides whose interior angles sum up to 900 degrees, how many sides does my shape have?

Inactive
Bereket Z.

I can always prove this relationship for you if you like, but I'd need to draw the shapes. Essentially the sum of all interior angles = (n-2)*180. 900/180= n-2 5=n-2 n=7

### Subject:Calculus

TutorMe
Question:

Explain the concept of instantaneous speed.

Inactive
Bereket Z.

### Subject:Physics

TutorMe
Question:

You have a box of 5kg floating in space, and is initially stationary relative to you. But now you push on it for 3 seconds with a force of 10 N, what is it's new velocity?

Inactive
Bereket Z.

When you apply a force to an object, it will accelerate; and all that means is its speed will change. If we use the expression F=ma, where F is force, m is mass and a is acceleration we can figure out what the acceleration of the 5kg box is. in this case, its acceleration is 2m s^(-2). this means every second the speed of the box increases by 2m's. since this force is applied for a total of 3 seconds, the total change in speed turns out to be 6 m/s. It's new velocity, therefore, is 6m/s.

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