Answer:
Explanation:
Given
mass of block
Force
Force is applied at an angle of
Displacement of block
coefficient of kinetic friction
Friction force acting on block
where N=Normal reaction
Work done by friction
Negative sign indicates that displacement is against the direction of force.
Answer:
The displacement is 33 m due west
Explanation:
From the question we are told that
The first displacement due east is
The displacement due west is
The second displacement due east is
Generally the displacement is mathematically represented as
=>
=> Note [-ive] represents west [+ive] represents east
Which means that the displacement is 33 m due west
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Answer:
5.5 to 7 Mohs
Explanation:
Glass ranks around 5.5 to 7 Mohs, but sapphire crystal has a hardness of 9 Mohs, making it only slightly less hard than diamond.
Answer:
Decrease the number of gas particles, increase the object's area, and reduce the temperature of the gas
Explanation:
<u>TEMPERATURE</u>:
Decreasing the temperature will slow down the molecules. Hence, less no. of collisions will take place between walls of object and molecules. This will result in decrease of pressure.
Therefore, the pressure of a gas can be decreased by increasing its temperature.
<u>NUMBER OF GAS PARTICLES</u>:
Decreasing the number of particles will result in less no. of collisions, hence decreasing the pressure.
Therefore, the pressure of a gas can be decreased by decreasing its no. of molecules or no. of particles.
<u>AREA OF OBJECT:</u>
The pressure is given by the formula:
where,
A = Area of Object
Therefore, the pressure of a gas can be decreased by increasing area of object.
So, the correct option is:
<u>Decrease the number of gas particles, increase the object's area, and reduce the temperature of the gas</u>