If a 50 kg student is standing on the edge of a cliff. Find the student’s gravitational potential energy if the cliff is 80 m hi
1 answer:
Answer:
Student’s(50 kg) gravitational potential energy if the cliff is 80 m high = 39.2 kJ
Explanation:
Potential energy is given by the expression, PE =mgh, m is the mass, g is the acceleration due to gravity value and h is the height.
Here mass of student, m = 50 kilogram
Height of cliff , h = 80 meter
Acceleration due to gravity =
Potential energy, PE = 50 * 9.8 * 80 = 39200 J
= 39.2 kJ
Student’s(50 kg) gravitational potential energy if the cliff is 80 m high = 39.2 kJ
You might be interested in
Answer:
Work done = 13605.44
Explanation:
Data provided in the question:
For elongation of 2.1 cm (0.021 m) work done by the spring is 3.0 J
The relation between Energy (U) and the elongation (s) is given as:
U = ................(1)
where,
k is the spring constant
on substituting the valeus in the above equation, we get
3.0 =
or
k = 13605.44 N/m
now
for the elongation x = 2.1 + 4.1 = 6.2 cm = 0.062 m
using the equation 1, we have
U =
or
U = 26.149 J
Also,
Work done = change in energy
or
W = 26.149 - 3.0 = 23.149 J