How much negative charge has been removed from a positively charged electroscope if it has a charge of 7.5*10^-11

Why is Mars surface temperature so low?

Why do optical astronomers often put their telescopes at the tops of mountains, whereas radio astronomers sometimes put their telescopes in deep valleys?

How many electrons must be removed from an electrically neutral silver dollar to give it a charge of + 2.4 μC?

A wave travels through a medium because

If a musical instrument such as trumpet or flute is "flat", should the pipe be lengthened or shortened? Explain with at least 2 content related sentences.

After creating a question and forming a hypothesis, what is the next step in the scientific method

Roger sees water balloons fall past his window. He notices that each balloon strikes the sidewalk 0.51 s after passing his window. Roger's room is on the second floor, 10 m above the sidewalk.

Which statements accurately describe the Doppler effect?

Describe how mass and distance affect gravitational force.

a bike can climb the inclined road at uniform speed of 72 km/hr by applying force 500N what will be the power applied by the bike?