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Answer: The coefficient of friction is 0.35
Explanation:
We can write the friction force as:
F = N*μ
Where N is the normal force between the refrigerator and the ground, as the full weight of the refrigerator is acting on the ground, the normal force will be exactly equal to the weight of the refrigerator, then:
N = 650N
And μ is the coefficient of friction.
And for this case, the force is 230N, then we have:
F = N*μ
230N = 650N*μ
(230N/650N) = μ = 0.35
Notice that the distance did not matter for this calculation.
According to the cameraman:
Initial velocity: 30 km/hr = 8.33 m/s
Final velocity: -(45 - 20) = -25 km/hr = -6.94 m/s²
a = (-6.94 - 8.33)/2
a = -7.64 m/s²
The direction is opposite to the motion of the car, that is, East.
According to the crew member on ground:
Initial velocity: 20 + 30 = 50 km/hr = 13.89 m/s
Final velocity: -45 km/hr = -12.5 m/s
a = (-12.5 - 13.89) / 2
a = -13.2 m/s²
The direction is the same, East.
Answer:
x = 16 [m]
Explanation:
This problem can be solved using the following equation of kinematics.
where:
Vf = final velocity [m/s]
Vo = initial velocity = 5 [m/s]
a = acceleration = 3 [m/s²]
t = time = 2 [s]
Now we can find the displacement using the following equation of kinematics.
Answer:
The slope of the position time graph gives the velocity.
Explanation:
The slope of the position time graph gives the value of velocity.
In first graph,
The slope is constant in both the parts but positive . So the velocity is also constant and positive for both the parts. and more than the second part, so the initial velocity is more than the final velocity.
In the second graph,
The slope is constant in both the parts but negative. So, the velocity is constant but negative for both the parts. Initial velocity is more negative than the final velocity.