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To reduce risk of slipping by increasing friction between tyres and road. while going up a mountain the opposing frictional force $F = μN =mg\cos\theta$ where $\theta$ is the angle of slope with horizontal .To avoid skidding $F$ should be large,so $\cos\theta$ should be large and hence $\theta$ should be small.so roads are made winding upwards.the road ...


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People don't immediately compress because the body is more or less a pressure vessel. It's not a very good pressure vessel for dealing with vacuum, but it's something. It's your body's resistance to pressure that lets you do things like spray bodily fluids (from your mouth, or from your bladder, or from your arteries). When my wife was in labor with my son, ...


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Then why do airlocks do this in movies? Good question. Why do space vehicles have wings in movies? Why do producers have all kinds of non-physical nonsense going on in scifi movies? The answer to these questions is simple: Because they make for such cool special effects. Don't take anything you see in a bad scifi movie as real. Real airlocks currently ...


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You could start with a pack of cards and ask how long does it takes for the whole pack to free fall after the bottom card supporting the rest of the pack is released all cards are individually held from the sides, and then released at the same time. From this, I think the answer to your original question is that it depends upon the shape of the ...



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