A grindstone in the shape of a solid disk with a diameter of 1.0 m and a mass of 50.0 kg, is rotating at 900 rev/min. A tool is
1 answer:
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There are two things that you should remember while dealing with the "Lever Mechanical Advantage" problems:
1) The Effort Arm;
2) The Resistance Arm.
Some books label the Effort Arm as in-lever arm and the Resistance Arm as out-lever arm. (Physics Jargon that you need to remember in order to solve problems)
The Effort Arm is that "part" of the lever where the force can be applied. The Resistance Arm is where some mass is placed. In the diagram, as you can see, the mass is placed on one arm of the lever. Therefore, it is the Resistance Arm.
Now the formula for the "Mechanical Advantage(MA)" is:
Where
is the length of the Effort Arm(the subscript "e" stands for Effort), and 
stands for the length of the Resistance Arm(here "r" stands for Resistance).
Plug in the values:
= 15m.
= 7m.
Therefore, / = 15/7 = 2.143 = MA
The correct answer is option C(2.14).
-i
1) The Effort Arm;
2) The Resistance Arm.
Some books label the Effort Arm as in-lever arm and the Resistance Arm as out-lever arm. (Physics Jargon that you need to remember in order to solve problems)
The Effort Arm is that "part" of the lever where the force can be applied. The Resistance Arm is where some mass is placed. In the diagram, as you can see, the mass is placed on one arm of the lever. Therefore, it is the Resistance Arm.
Now the formula for the "Mechanical Advantage(MA)" is:
Where
Plug in the values:
Therefore,
The correct answer is option C(2.14).
-i
Answer:
Explanation:
<u>Given:</u>
= initial velocity of the electron =
= final velocity of the electron =
= initial position of the electron from the proton = very distant =
<u>Assume:</u>
= mass of an electron =
= magnitude of charge on an electron =
= magnitude of charge on an proton =
= Boltzmann constant =
= final position of the electron from the proton
= change in kinetic energy of the electron
= work done by the electrostatic force
= electrostatic force
= instantaneous distance of the electron from the proton
Let us first calculate the work done by the electrostatic force.
Using the principle of the work-energy theorem,
As only the electrostatic force is assumed to act between the two charges, the kinetic energy change of the electron will be equal to the work done by the electrostatic force on the electron due to proton.
Hence, the electron is at a distance of when the electron instantaneously has speed of three times the initial speed.