A push broom is being pushed down across a rough floor. The broom moves to the right. What is the correct free body diagram of t
he broom?
2 answers:
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Answer:
The velocity of the car when it hits the ground is approximately 55.574 meters per second.
Explanation:
According to this expression, the car goes straight into the cliff and goes down due to gravity, whose situation is described by the Principle of Energy Conservation and supposing that all non-conservative forces are negligible:
(1)
Where:
,
- Gravitational potential energies of the car at the top and the bottom, measured in joules.
,
- Translational kinetic energies of the car at the top and the bottom, measured in joules.
By definitions of gravitational potential and translational kinetic energies, we expand and simplify the equation above:
(2)
Where:
- Mass, measured in kilograms.
,
- Velocity of the car at the top and the bottom, measured in meters per second.
- Gravitaitional acceleration, measured in meters per square second.
,
- Height of the car at the top and at the bottom, measured in meters.
If we know that ,
,
and
, then the velocity of the car when it hits the ground is:
The velocity of the car when it hits the ground is approximately 55.574 meters per second.