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What else can I help you with?
Why does a piece of chalk wear out as it is used on a blackboard?
With every stroke of the chalk piece it leaves some of the chalk on the board. This abrasion of the piece of chalk causes it to wear down. This is similar to why the rubber tyres of cars wear down when they are driven over a road surface.
What time does the clock say when Bart is writing on the chalk board during the opening sequence?
3 pm
How has anemometers changed over time?
how the anemometer changed over time
Why your black board does look white after using again and again?
because the particles of the chalk or any other substance which is used to write on black board has very tiny particles which get attached with white board.
How have the laws of physics changed of time?
The laws of physics have not changed over time. Our understanding of them has changed over time.
How has coal changed over time?
how has coal mining changed over time
How have people changed over time?
People changed over time by growing up.
Did the microphone always looked the same in 1876?
no they have changed over time. no they have changed over time.
How did Niels Bohr model changed over time?
how has neils bohr model changed over time
How has bachata changed over time?
well it has changed over time bye people dancing it different styles.
How has the seismograph changed over time?
how the seismograph change over time
How Delaware changed over time?
how has deleware changed from 1776
