mass of proton is 6 x pi raised to power 5 times mass of electron
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the volume of a cylinder is (pi) x (r squared) x (h) where r = radius and h = height. unfortunately you dont say if the height is 5 or 6mm! if we take it that it is 5mm high, then- vol = 3.142 x 3 x 3 x 5 = 141.39mm if it is 6mm high, then- vol = 3.142 x 2.5 x 2.5 x 6 = 117.825mm
(5 x 5 x 5)/(6 x 8) = 125/48 = 2.604166667
Three significant figures of 1.702 x 10^5 are 1.70 x 10^5.
The power used by the heater can be calculated using the formula: Power = Voltage x Current. In this case, the power would be 460 volts x 5 amps = 2300 watts.
OK, The circumference of a circle is 2 times pi (3.14) times the radius. SO the radius is = to circumference (5cm) divided by 2 times pi. 5 divided by 6.28 = .796 time 2 gives us a diameter of = 1.59 centimeters. We could also use Pi = cicumference/diameter therefore 3.14=5/x Multiply both side by x and 3.14 x = 5 Divide both sides by 3.14 and you get x= 5 divided by 3.14 which equals 1.59 cm