A new cat 6 cable run and key stone jack were installed for a workstation that was moved from the sales department to the shippi
1 answer:
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The mechanical energy of the car is
Explanation:
The mechanical energy of an object is equal to the sum of its gravitational potential energy (GPE) and its kinetic energy (KE):
E = GPE + KE
The GPE of the car is given by:
where
m = 1000 kg is the mass of the car
is the acceleration of gravity
h = 30 m is the height of the car above the ground
Substituting,
The kinetic energy of the car is given by:
where
m = 1000 kg
v = 50 m/s is the speed of the car
Substituting,
Therefore, the mechanical energy is
Learn more about potential energy and kinetic energy:
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Answer:
Explanation:
Coefficients of Friction
Objects in physical contact produce friction which usually manifests as thermal energy being dissipated in the surface where the objects are interacting. It's usually harder to start to move an object from rest, that keeps moving it at a constant speed on the same surface. That is why there are two different coefficients of friction: the static and the dynamic. As mentioned, the static coefficient is greater than the dynamic coefficient
. The car is already moving and is attempting to stop. The coefficient of friction is defined as
Where Fr is the force of friction and N is the normal or the force the road pushes back up on the car. With the given data, we have
The coefficient of friction is dimensionless (doesn't have any units)