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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Answer:
And the forces are equal but in the opposite direction. So then we can write by general rule:
Or equivalently:
Where: represent the speed of the car and
the speed of the ball
represent the mass of the car
represent the mass of the ball
Since the ball is moving to the left and we assume that the total momentum not changes then the car need to move to the right in order to satisfy the equation and satisfy the balance.
By conservation of the momentum the car will move to the right since the ball is moves to the left.
So then the correct option for this case is :
A.Yes, and it moves to the right.
Explanation:
If we assume that we have the situation in the figure attached.
For this case we assume that the momentum changes are equal in magnitude and opposite in direction, so then we satisfy this:
And the forces are equal but in the opposite direction. So then we can write by general rule:
Or equivalently:
Where: represent the speed of the car and
the speed of the ball
represent the mass of the car
represent the mass of the ball
Since the ball is moving to the left and we assume that the total momentum not changes then the car need to move to the right in order to satisfy the equation and satisfy the balance.
By conservation of the momentum the car will move to the right since the ball is moves to the left.
So then the correct option for this case is :
A.Yes, and it moves to the right.
