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How do you calculate the surface volume on a four dimensional object?
We can think time as a 4D object, but we cannot visualize so easily a 4D object. But surely we know that a 4D object cannot live inside the 4D space, it will live in the 5th dimension space. We know that we can calculate the hyper-volumes by using integration (in our case) over a R4 domain which is not so easy to be visualize also. For example by hand we can construct a R3domain by using the xyz-coordinate system.
Why isometric drawing is started with 30 degree angle to horizontal line?
That's what an isometric drawing is: the third dimension is shown at a 30 degree angle to the horizontal. The number 30 isn't magic - any other number in that 'ballpark' would work - but it's an easy number ( a third of a right angle, and it's clearly different from 60 degrees, which is why 45 degrees wouldn't be great), and the resulting drawing makes the 3-D object easy to visualize.
Why does a negative number subtracted from a negative number equal a positive number?
Lets say you are in debt to a bank and have a negative balance. If I subtract that balance (take the negative balance off you) then you have gained money. That is the easiest way to imagine it. I do understand mathematical concepts are not alwys easy to understand.
What unit do you use to find the volume of a solid object?
Cubics lengh x width x height. Not easy unless it is has measurable sides with right angles
If an object weighs 39.2 N on Earth.What is its mass?
Oh, dude, it's like this - the weight of an object is the force of gravity acting on it, which is 39.2 N in this case. Mass, on the other hand, is a measure of how much matter is in an object. So, to find the mass, you just divide the weight by the acceleration due to gravity (9.8 m/s^2), and voilà, you get the mass of the object, which is around 4 kg. Easy peasy, right?
