How do you find the area of this?  I had to do an experiment where you take a styrofoam cup and poke a flashlight through the bottom of it, then shine the light onto a wall from different distances and measure the diameter. I have to calculate the area. It it just pi*r^2? That's what I did, but then I've seen someone else use 4*pi*r^2 and that confused me. I want to make sure I done it right.

Q: one meter is 100 cm. Does it therefore follow that one cubic meter is 100 cubic centimeters? explain…

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Q: What is the answer for 206.7 + 0.28 x 0.439 with the correct number of significant figures? (q122)…

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Q: But where do you derive the equation E=(K|q|)/r?  My book says E=(K|q|)/r^2.

A: According to general equation of electric field ,  E = kQr2

Q: : The fuel tank on a car has a depth d= 0.472 m. The fuel level in the tank is detected by a sensor…

A:

Q: why do you have 6cm in the question?   also q1=1.6x10^-5 and q=4.8x10^-5  can u please retry

A:

Q: Ben showed that 1 teaspoon ( ~ 5 cm^3 ) of oil would cover 2024.3 m^2 of still water. What is the…

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Q: Given q = 77 - 10j and d = − 6ỉ – 4j, find + d and |||| + - ||ď||. Give EXACT answers. You do NOT…

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Q: distance, what would be ertainty in the size of q

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Q: For this problem, time is given by the variable t, position by s, area by A, and volume by V.…

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Q: Part B is wrong FA=(2mw(L−x)+mbL)g/2L is the formula but I'm unsure which numbers to plug in where.

A:

Q: I have a question for the square root of units. So I have the formula 2pi√m/k And m=50g and…

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Q: c. Below are data on the length and weight for the Blue Marlin [2]. Length (m) Weight (kg) Length…

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Q: Two forces, F₁ and F2, act at a point, as shown in (Figure 1). F₁ has a magnitude of 9.00 N and is…

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A:

Q: uncertainty.

A: Given: A function y=Asinωt A=2.054±0.012 m ω=2735±8 s-1 t=0.000341±0.00015 s Note: sinx+∆x=∆xcosx;…

Q: Given that Ã+ B = x₁ Î+Y₁Ĵ and ì B = x₂Î +⁄₂Î, what is ?

A: Addition of two vectors is A→+B→=x1i^+y1j^ Subtraction of the same vectors is A→-B→=x2i^+y2j^ Find:…

Units and Dimensions

These are generally defined as the terms which precede or describes the dimensions further. These are also further divided into two parts namely fundamental units and the derived units.