What is the gravitational potential energy of a book with a mass of 0.30 kg on a 1.0 m high desk?
2 answers:
Answer:
Potential energy, PE = 2.94 joules
Explanation:
Given that,
Mass, m = 0.3 kg
It is placed at a height of, h = 1 m
We need to find the gravitational potential energy of the book. It is given by :
PE = mgh
PE = 2.94 Joules
So, the potential energy of the book at this height is 2.94 Joules. Hence, this is the required solution.
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Given:
The thermal energy added to the system is Q = 90 J
The work done by the system on the surroundings is W = 30 J
To find the change in internal energy.
Explanation:
According to the first law of thermodynamics, the change in internal energy can be calculated by the formula
On substituting the values, the change in internal energy will be
Final Answer: The chage in internal energy is 60 J (option D)
Answer:
Explanation:
The correct equation follows the law of conservation of energy where kinetic energy is all transformed to potential energy, since we know that kinetic energy is expressed as
while potential energy is mgh where m is the mass of the object, v is the velocity or speed of the object, g is acceleration due to gravity and h is the vertical height. Therefore, relating the two equations we should have