Category: Physics

How much HF is lethal? Hydrofluoric acid is one of the strongest acids known that has a strong lipophilic ability. Ingestions of more than 20 mg/kg body weight are considered a lethal dose. Even after dermal exposure, the fatal prognosis is caused by severe electrolyte disturbances, especially hypocalcemia. What does an HF burn feel like? […]

How much force does it take to move a railcar? First, a force of 2 to 5 pounds per ton of train weight is required to move on straight level track. At very slow yard speeds only 2 to 3 pounds is needed while increasing to about 5 pounds at higher speeds. This force is […]

What prevents the wrong gas from being connected to the equipment? The connection is marked with a Compressed Gas Association (CGA) number and will be left-hand or right-hand threaded to match the nut or fitting. This prevents a piece of incompatible gas equipment from being connected to the wrong gas supply. Can gas cylinders explode? […]

What is G value on glass? The g value of the glass simply tells us how well the glass transmits heat from the sun. It is expressed either as a percentage, or simple decimal. A g value of 1.0 (100%) would tell us that all solar heat could enter the building (so without any glass), […]

How do you read contour intervals? How To Read Contour Lines Index lines are the thickest contour lines and are usually labeled with a number at one point along the line. Intermediate lines are the thinner, more common, lines between the index lines. Supplementary lines appear as dotted lines, indicating flatter terrain. What is another […]

How is flow rate related to radius? To put this relationship into words: At a given temperature, flow rate through a tube or pipe is inversely proportional to the length of the tube the viscosity of the liquid. Flow rate is directly proportional to the pressure gradient and the fourth power of the radius of […]

Will a 220v bulb work on 120V? No, unless you want to have one quick flash. However, you can use a 220/240 watt bulb in North America. It will shine only half as brightly though. Will a 240V bulb work with 110v? The bulb will either not work, produce a very dim light, or work […]

What is the derivative of x? The derivative of a function y = f(x) of a variable x is a measure of the rate at which the value y of the function changes with respect to the change of the variable x. What does f ‘( x mean? The expression “f (x)” means “a formula, […]

How do you solve accuracy and precision? Find the difference (subtract) between the accepted value and the experimental value, then divide by the accepted value. To determine if a value is precise find the average of your data, then subtract each measurement from it. This gives you a table of deviations. Then average the deviations. […]

Which is better Armageddon or Deep Impact? However, there is still much debate between film lovers about which one is generally considered the better film. While Armageddon stands out as the fan favorite because it’s a more entertaining movie, a lot more people prefer the emotional depth that comes with Deep Impact. What made more […]