The frictional force acts upwards, so as to oppose the downward force of gravity. The reason that pressing against the wall harder makes the book stick more is because the reaction force from the wall increases and frictional force is directly proportional to reaction force.
Answer:
600 W
Explanation:
The power consumed by a load (resistance) is given by
where
P is the power
V is the voltage
I is the current
For this load, we have:
V = 120 V
I = 5 A
Substituting,
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