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Civil Engineer, interested in the planet Earth... and cheesecake
MY WHOLE LIFE IS A LIE
This is a blatant violation of trust
YOU LYING FUCKS I SPENT MY WHOLE LIFE ADMIRING THE BRICK LAYERS THAT ALWAYS LAY THE BRICKS NEAT AND PERFECTLY LINED UP HOLY SHIT I LOOK UP TO YOU HOW COULD YOU
I FEEL LIKE SOMEONE JUST TOLD ME SANTA CLAUSE ISNT REAL ALL OVER AGAIN
SON OF A BITCH
I mean, you guys are complaining, but it’s not like this is done purely to pretend the paths are bricks. There’s a structural reason - namely, that large concrete slabs will unavoidably crack and degrade when undergoing expansion and contraction due to temperature changes (unless much larger compression forces are applied via expensive steel reinforcement cables through the slab that are generally used in buildings not general pavement). This causes those cracks to form along the pattern, thereby eventually turning the slab into actual bricks (instead of cracking randomly and therefore potentially dangerously).
Also it’s a shitload cheaper than creating and laying bricks, which results in more infrastructure for the same price, and looks pretty much the same in the end, so what the hell are you all complaining for seriously chill the fuck out. You’re probably the kinds of people who would have complained the first time they saw a farm plough being used, like “what they don’t dig the field and plant all the plants individually by hand oh my god I feel so BETRAYED!”
(Also often they actually are bricks, particularly in higher economically-performing areas, but that’s beside the point.)
Civil Engineer here, Beanni’s right. Although usually concrete surfaces are placed in sections so that when it does expand and contract it has room to move rather than spending extra time adding a brick pattern.
You can see from the photo though that they’ve laid the concrete the whole length without sectioning it.
The Sonic Boom, as seen above, is caused by the Doppler Effect - that thing Sheldon explained on the Big Bang Theory.
When an object is stationary, while emitting sound, the sound waves spread out uniformly in a circle from the source, as seen in the second image, however when that object begins, as seen in the third image, to move the circles are not emanating from the same position, so the troughs and crests (represented by the black lines) of each wave are in are closer together on one side and further apart on the other.
So when the object is traveling at the speed of sound all the troughs/crests are perfectly aligned on one side, where they then amplify each other (positive and negative superposition) producing a loud burst of sound and also pressurising the air close to the source which is why a cloud is seen.
This effect can also be observed with light, theoritically, however first we need to make something that can, somehow, reach the speed of light ;)
We have to design high speed rail tunnels so that there are no residual effects from air vibrations caused by trains passing through a tunnel. The criteria ensures passenger comfort is maintained. When the first shinkansen were built in Japan, unforeseen aerodynamic effects caused passengers to feel discomfort as they passed through tunnels; since then, design has advanced and the aerodynamic effects are mitigated, usually by inclusion of ‘porous’ portals at the entrance/exit to the tunnel which allow the pressure waves to dissipate.
Alice Through the Microscope: The Power of Science Over Women’s Lives (Brighton Women and Science Group) 1980
Athena Unbound: The Advancement of Women in Science and Technology (Etzkowitz) 2000
Athena Meets Prometheus: Gender, Science And Technology—a Selected Bibliography (Eldredge) 1988
Long post, click through for more!
Fuck what tha road said
Anyone know where this is?
The second link is especially interesting!