Answer:
v =163.95 m/s
Explanation:
Given that,
The wavelength of wave, 
Distance covered, 
We need to find the speed of the wave. We know that,
speed = distance/time
So,

So, the speed of the wave is equal to 163.95 m/s.
Answer:
The centripetal acceleration
of an object moving in a uniform circular path is given by the following equation:

Where:
is the velocity
is the radius of the circle


Answer: 0 (zero)
Explanation:
The formula for torque = force × perpendicular distance between force and point of rotation.
Where force = 6.3 N, distance between force and point of rotation = 2.1m
It has been stated from the question that the force is applied in such a way that it is parallel to the position vector.
If we take the magnitude of this position vector, it will give the distance between the force and the point of rotation which still shows that the force is parallel to the rotation point which does not satisfy the condition for torque to occur hence torque is zero.
Answer:
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Machine
Subject: Science
Home Grade 9 Science Machine Machine
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Syllabus
Measurement
Force
Machine
Machine
Types of Simple Machine
Moment
Work Energy and Power
Sound
Light
Electricity and Magnetism
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Overview
Simple machine helps us by magnifying force, accelerating work and by changing the direction of force. This notes gives us the information about machine, its importance, mechanical advantage, velocity ratio.
Note
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Machine
We use various tools to perform different types of work in our daily life. The tools or simple devices used for making our work easier, faster and more convenient are simple machines.
Those tools or devices which make our work easier and convenient in the direction of the force is called simple machine.
Purpose of using simple machine
Simple machines are used to make our work easier in the following ways:
By multiplying force.
By changing the directions of force.
By transferring force from one point to another.
By increasing the rate of doing work.
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