5. During an anti-bullying club meeting after school, a student mentions that a new student has joined your class at school. The
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Answer : The mechanical energy of the rock is, 134 J
Solution :
As we know that the mechanical energy is equal to the sum of the kinetic energy and the potential energy.
The formula used for mechanical energy is,
where,
M.E = mechanical energy
K.E = kinetic energy
P.E = potential energy
m = mass of an object = 2 Kg
v = velocity of an object = 6 m/s
h = height = 5 m
g = acceleration due to gravity =
Now put all the given values in the above formula, we get the mechanical energy of the rock.
Therefore, the mechanical energy of the rock is, 134 J
Answer:
the natural length of the spring is 9 cm
Explanation:
let the natural length of the spring = L
For each of the work done, we set up an integral equation;
The second equation of work done is set up as follows;
solve equation (1) and equation (2) together;
Therefore, the natural length of the spring is 9 cm