How can resistance be useful and where can they be useful?
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-- Resistance can be useful among the population of a repressive government. Although it can be dangerous for those who resist, it can also exert pressure against the regime to alter its repressive practices.
-- Resistance can also be useful in electronic circuits. "Lumped" components with known numerical values of resistance are used to divide voltage, limit current, and dissipate controlled amounts of electrical energy.
The force of repulsion between two identical positive charges is 0.800 N when the charges are 0.100 m apart. Find the value of each charge.
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Answer:
Value of each charge is given as
Explanation:
As we know that electrostatic force between two charges is given as
here we know that
r = 0.100 m
now we have
What does balanced and unbalanced forces have to do with newtons laws of motion
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Newton's second law of motion involves the effect of force acting on a mass. It has to be understood that this actually means the combination of any and all individual forces acting on it, with their individual strengths and directions all added together.
When all the individual forces acting on an object add up to zero, then the whole group of forces is said to be 'balanced'.
When all the individual forces acting on an object don't add up to zero, then the whole group of forces is said to be 'unbalanced'.
Notice that there's no such thing as 'a balanced force' or 'an unbalanced force'. It's a group of two or more forces that's balanced or unbalanced.
A train takes ms eaddy 200 miles north and 150 miles south. The total trip took 3.5 hours what was the average velocity of the train in MPG?
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The whole point of this problem is to check how well you understand the definitions of a few important quantities, like velocity, speed, distance, displacement etc.
Before we begin, I just want to mention that 'MPG' is not a unit of either velocity or speed, but I think I know what you mean.
-- For some reason, Ms. Eaddy rode 100 miles north on the train, then stayed aboard while the train turned around and took her 150 miles south. The total distance she rode was (100 + 150) = 250 miles. But she ended up 50 miles south of where she began.
-- Displacement for the whole trip = distance and direction from the start point to the finish point.
Displacement = 50 miles south
-- Average velocity = (displacement) / (time)
50 miles south / 3.5 hours = 14.29 miles per hour south
which phenomenon is most directly responsible for earth’s magnetic field? Earth spinning on its axis. The moon's gravitational pull on earth? Earth's revolution around the sun? The moon's revolution around earth?
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Earth spinning on its axis
The rate at which work is done is
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Answer:
Power
Explanation:
I just took the quiz
The definition for Power = Work Done / Time taken
Hence the rate at which work is done is called Power.
Power is measured in Watts. Work done is measured in Joules and Time taken is in Seconds.