A 4.1 object is lifted to a height of 4.5m above the surface of Earth.What is the potential energy of the object due to gravity?
1 answer:
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Answer:
Explanation:
Given:
length of ladder
weight of ladder
position of firefighter
weight of firefighter
angle of ladder
Unknown:
force of the wall on the ladder
force of friction on base of ladder
normal force on base of ladder
From the free body diagram of the sketch you get 3 equations:
Solving the equations gives:
a)
b)
c) Using the result from b and solving for
Answer:
-5 V
Explanation:
The charged particle (which is positively charged) moves from point A to B, and its kinetic energy increases: it means that the particle is following the direction of the field, so its potential energy is decreasing (because it's been converted into potential energy), therefore it is moving from a point at higher potential (A) to a point at lower potential (B). This means that the value
vb−va
is negative.
We can calculate the potential difference between the two points by using the law of conservation of energy:
where:
is the change in kinetic energy of the particle
is the charge of the particle
is the potential difference
Re-arranging the equation, we can find the value of the potential difference: