friction between sliding surfaces is caused by _____. inertia, microwelds, the normal force, or gravity
2 answers:
Answer:
<h2>The normal force.</h2>Explanation:
Friction can be defined as the resistance of movement applied on a object, that's why is always in opposite direction of the movement.
However, the full definition is accomplish by analysing its equation:
Where is the coefficient of friction, which change from 0 to 1, depending on the material of the surface.
refers to the normal force, which is the reaction of the weight, according with Newton's third law, its equal and opposite to the weight.
As you can see, friction depends directly on the normal force, the greater is this force, the greater will be the "friction force".
Therefore, the right answer is the third option.
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Answer:
The period of the system of ladder and woman, T = 2.5 seconds
Explanation:
Mass of the ladder,
Mass of the artiste,
Length of the ladder, L = 42.0 kg
The total moment of inertia can be calculated using the equation:
D = L/2 = 3/2
D = 1.5 m
The frequency of the system of ladder and woman follows that of a physical pendulum which can be given by the equation:
The period of the system of ladder and woman is given by:
T = 1/f
T = 1/0.4
T = 2.5 seconds
Answer:
Explanation:
What problem says can be written mathematically as:
Where:
The problem itself it's really simple, we only need to replace the data provided in the previous equation, but first, let's convert the units of the velocity from cm/s to m/s because we have to work with the same units and working in meters is the most apropiate action, because is the base unit of length in the International System of Units:
Now, we can replace the data in the equation and find the time it will take the bird to travel 3.7 m:
Solving for t, multiplying by t both sides, and dividing by 0.52 both sides: