What is the GPE of the 10-kg rock at the top of the house, at the top of the cliff and at the bottom of the cliff?
Answers
Answered by
0
please give the height ok
Answered by
0
Answer:
See explanation.
Explanation:
I think there are mistakes in those answers.
The GPE of a body is given as:
E
G
=
m
×
g
×
h
where
m
is mass (here
10
k
g
),
g
is gravitational acceleration (here
g
=
9.8
m
s
2
),
h
is height above the ground.
So
In point
a
(at the top of the house) the energy is:
E
P
=
10
×
9.81
×
5
=
490
(so here the value from
b
is correct)
In point
b
we have:
E
p
=
10
×
9.81
×
25
=
2450
(not in the given values).
At the bottom the energy should be
0
(as you suggested)
Note:
The energy close to answer
c
is possible if we assume that the house stands on the top of the cliff. Then you would have to add the heights of the house and the cliff, so you would have:
E
p
=
10
×
9.8
×
(
25
+
5
)
=
10
×
9.8
×
30
=
2940
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