Amin

I think the best way to understand both of these concepts, is to first move away from Newton's view of gravity and understand it from Einstein's perspective. Einstein's theory of gravity is general...

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3. Faster than light?

Just to point something out for anyone who passes by this thread, the "A+B" in the images is just referring to the fact that vector A and vector B have to be combined, and that when added appropria...

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3. Adding Vectors

Hi Maia, I'm not sure exactly what is meant by the "acid reaction" or the base formula; I may have learned this slightly differently, but I'll go through how I was able to solve this (can't be that...

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2. Content Requests and Feedback
3. Chemistry Redox Reactions

Hi Kimm, The molecule adenosine triphosphate, or ATP, is typically understood as the "energy currency" of biological processes.  ATP is a high-energy molecule that transfers and releases energy nee...

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3. Biology

If you're at such a great distance from the star that the star's light hasn't had time to reach you since it formed, then yes, you would not see it :] If you wait long enough you will be able, at l...

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3. stars and light

When you evaluate the binomial using Pascal's triangle, you have to remember to substitute the terms and their signs within parentheses. So, while the statement -p^0 = -1 is true, it is used incorr...

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3. binomial theorum and pascal's triangle

Hi e.davis.brown.  Did you remember to use the appropriate sign when evaluating the angle sum identity (eg, sin300 is negative, not positive)? Here's what I was able to get: cos(A+B) = cosAcosB - ...

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3. Using addition/subtraction identities to solve an angle

If sin theta = 3/4, then theta = sin^-1(3/4) = 0.84806207898148... By the identity sin theta = sin(pi - theta), theta can also be 2.29353057460831... Even though neither answer can be written as a ...

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3. Trigonometry: Pythagorean Identities

It is possible, as long as you're going to the future.  Hawking was describing the phenomenon of time dilation.  If you hopped into a spaceship and left Earth, travelling very close to the speed of...

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3. is time travel possible

Gravity doesn't warp spacetime.  Gravity is warped spacetime.  Mass causes spacetime to warp in its presence; therefore, mass gives rise to gravity. The familiar analogy that many use is the two-di...

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3. how can gravity wrap space-time when space itself is not a sheet but a volume