Answer:
Explained
Explanation:
1.The macroscopic form of kinetic energy is organized whereas the microscopic kinetic energy disorganized form of energy.
2.Observing macroscopic kinetic energy is easier than the microscopic energy.
3. All macroscopic kinetic energy can be converted to useful work whereas microscopic kinetic energy can not be.
4. Macroscopic kinetic energy is possessed by moving objects whereas microscopic objects possessed by the virtue of motion, rotation, vibrations of atoms in substance.
Wind energy is macroscopic energy as it can be harnessed to produce electricity and perform some useful work. And discussed above useful work can only be performed using macroscopic kinetic energy.
Answer:
The first law of thermodynamics, also known as Law of Conservation of Energy, states that energy can neither be created nor destroyed; energy can only be transferred or changed from one form to another. For example, turning on a light would seem to produce energy; however, it is electrical energy that is converted. Nothing happens to the energy. It does not change form, since energy has no form. ... If the energy was moving, it gets stored or re-transmitted elsewhere. Using energy means controlling its movement, rather than consuming it.
<span>100000
Decibel (dB) is a logarithmic scale of power. Depending upon if you're looking for power, or root power a change in the power by a factor of 10 will be 10dB, or 20dB. Since this question is asking about "sound intensity" it's looking for a power factor, not a root-power factor (which would be the case for sound pressure). So we're looking for a 50 dB increase (100 dB - 50 dB) = 50 dB which means that we're wanting 10^5 = 100,000 times as much power. Assuming each identical voice contributes the same amount of power, you'd have 100,000 (one hundred thousand) voices talking at once for a sound intensity of 100 dB.</span>
Complete Question
The complete question is shown on the first uploaded image
Answer:
The value is 
Explanation:
From the question we are told that
The mass of the block is 
The initial speed of the block before entering the rough section is 
The time taken is t = 0.5 s
The speed with which the block leaves the rough section is 
Generally from kinematic equation
=> 
=> 
=> 
Generally the magnitude of the average frictional force is mathematically represented as
=>
=> 
The negative sign show that the force is acting in the opposite direction to the direction of motion of the block
