Has an Atomic number of 1.
1 answer:
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Answer:
5.886 J
Explanation:
Given:
The mass of the book is, kg
Height of lift is, m
Acceleration due to gravity is, m/s²
Now, gain in gravitational potential energy is a function of change in position and is given as:
Here, is the change in gravitational potential energy.
Plug in 0.5 kg for , 9.81 for
and 1.2 for
. Solve for
Therefore, the gain in gravitational energy of the book is 5.886 J.
The car will slow down due to the negative acceleration (backward)
Explanation:
The figure is missing: find it in attachment.
To answer this question, we have to use Newton's second law, which states that:
where
F is the net force on an object
m is its mass
a is its acceleration
We have to apply this law separately on the horizontal direction and vertical direction.
- In the vertical direction, we have two forces acting on the car: 2000 N upward and 2000 N downward, so they cancel out, and the net force in the vertical direction is zero.
- In the horizontal direction, the net force is instead
In the backward direction (to the right).
So, according to Newton's second law, the car will experience a horizontal acceleration:
And the acceleration has the same direction as the net force (so, backward). This means that the acceleration is opposite to the direction of motion of the car, so the car will slow down, since its velocity will decrease.
Learn more about acceleration:
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