Say True or False; An object on the Moon weights 1/6 of what it weights on the Earth. Therefore, the object has less inertia on the Moon.( Justify your answer)
Answer: The statement is false.
Inertia depends on mass and not on weight. The weight on moon is less not because of a decrease in mass, but due to the decrease in the acceleration due to gravity on the surface of moon.
Inertia depends on mass and there is no change in mass when a body is taken to moon. Therefore the inertia of a body is same on moon as that on earth or anywhere else in the universe, even in a gravity free space.
Is it true that a person touching a high power line get struck with the line?
Ya, This is due to the strong contraction of the muscles making the person not at all able to release the wire or object from which he got the shock. Not due to any type of attraction arising out of electricity.
What is buoyant force? I’m unable to understand practically from book. please give vast and practical explanation.. (Raj asked)
Whenever a body is immersed in a fluid, say water, it experiences an upward force acting on it. The upward force exerted by a fluid on an object immersed in it is called Buoyant force.
If the object placed in a fluid is denser than the fluid, it will sink. Though it experiences an upthrust, its weight will be more than the upthrust.
The upthrust is equal to the weight of liquid displaced by the immersed part of the body.
If the object is of less density than the fluid, it will come up and float.
For a floating body, the net weight is equal to zero, as the upthrust balances the actual weight of the body.
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Discuss a circumstance in which angle between velocity and acceleration is less than 90.
Discuss a circumstance in which angle between velocity and acceleration lies batween 180 and 90.
(Hifsa Zafar asked this)
In projectile motion when the object is moving up, the angle between velocity and acceleration (due to gravity g) is between 90 degree and 180 degree.
during the downward motion of a projectile, the angle between velocity and acceleration is between 0 and 90 degree.