A scientist pours grape juice on three identical white shirts. He then uses three different cleaning products on the shirts and
2 answers:
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Answer:
The block has an acceleration of
Explanation:
By means of Newton's second law it can be determine the acceleration of the block.
(1)
Where represents the net force, m is the mass and a is the acceleration.
(2)
The forces present in x are and
(the friction force):
Notice that subtracts to
since it is at the opposite direction.
The forces present in y balance each other:
Therefore:
(3)
But and writing (3) in terms of a it is get:
So the block has an acceleration of .
If the resistor is in series with the rest of the circuit then a is the correct answer. The voltage across the resistor in series with another resistor is
where R is the big resistor and r is the small one and V is the total voltage drop across both. This is called a voltage divider
where R is the big resistor and r is the small one and V is the total voltage drop across both. This is called a voltage divider