Answer:
Explanation:
The forces acting on the crates when the train starts stopping are their weights, the normal force from the train, the static frictional force and the fictional force that is produced by the deceleration of the train. As the gravitational force, this fictional force is equal to the mass of the crates multiplied by the magnitude of the acceleration of the train. So, the equations of motion of the crates will be:
Since the static frictional force is , we get:
So we have a limit to the acceleration of the train. Now, we have to know the distance traveled by the train when it is stopping. Then, we use the kinematic formula:
Now we solve for the acceleration to combine this equation to the inequality we got before:
And solve for x:
Since we are looking for the minimum value for x, we consider the case in which that inequality becomes an equation:
Before we finish, we have to convert the unities of the initial velocity to meters per second:
Finally, we plug in the known values to get :
It means that the train can be stopped at a minimum distance of 36.2m at constant acceleration without causing the crates slide over the floor.
Answer:
The intensity of light passing from the third polarizer is 3Io/16.
Explanation:
The law of Malus is given by
Let the incident intensity of light is Io.
The intensity of light passing from the first polarizer is
The intensity of light passing from the second polarizer is
The intensity of light passing from the third polarizer is
The patient eating a candy bar instead of fasting for the test should be told
that the test results will be wrong and he may receive a wrong diagnosis.
The medical practitioners told him to fast when coming for a reason and he
forgetting and eating something means the objective for the test may have
been defeated.
This is why it's best to explain to him about the consequences of his actions
which is likely getting a wrong result and diagnosis.
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10 newton east is the answer because the two force vector form 0 degree angle with each other