Answer:
m = 3.57
Explanation:
Given that,
Sergei uses a lever to lift a heavy rock. He obtains a 2.5m lever and places the fulcrum 0.7m from the rock.
We need to find the ideal mechanical advantage of Sergei's lever.
It is equal to the ratio of resistance arm to the effort arm. In terms of length it is given by :
So, the ideal mechanical advantage of the lever is 3.57.
Answer: Reduction in skin resistance as a result of increased perspiration leading to conduction.
Explanation:
A lie detector is a machine used to detect when someone is lying.
This is so because when an individual lies, there is an increase in heart beat which causes an increase in sweating. As the the individual sweats there is a reduction in the resistance at skin surface leading to current conduction across the connected cables.
Physical property is defined as a property that can be observed without changing the matter into another type of matter.
<h3>What are physical properties of matter?</h3>
Physical properties of matter are those properties which can be easily observed without a change in the composition of the substance,
Some physical properties of matter include:
- Volume
- Shape
- Density
- Taste
- Color
- Mass
- Electrical conductivity
In conclusion, physical properties do not change the composition of matter and can easily be observed.
Learn more about physical properties at: brainly.com/question/12330204
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Answer:
Increase the amplitude
Explanation:
The energy conveyed by a wave is directly proportional to the square of its amplitude. Thus; E ∝ A²
This means that increasing the amplitude will lead to an increase in the energy.
Now, the amplitude of a wave is the height of a wave from it's highest point known as the peak, to the lowest point on the wave known as the trough whereas wavelength refers to the length of a wave from one peak to the next.
This means that increasing the amplitude has no effect on the wavelength.
Kinetic energy is the energy of an object that is moving. It is calculated from one-half the product of the mass and the change in square of the velocity of the object. It is the opposite of potential energy which the energy possessed by an object at rest. We calculate as follows:
KE = mΔv^2 / 2 = 45 ( 6^2 - 12^2 ) = -4860 J had been lost by the skater
