Like theories, scientific laws describe phenomena that the scientific community has found to be provably true. Generally, laws describe what will happen in a given situation as demonstrable by a mathematical equation, whereas theories describe how the phenomenon happens.
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The internal resistance of the washing machine is 137.14 Ω.
<h3>What is internal resistance?</h3>
Internal resistance is the inherent resistance of a conductor.
To calculate the internal resistance of the washing machine, we use the formula below.
Formula:
- P = I²R................... Equation 1
Where:
- P = Power of the washing machine
- I = Current
- R = Internal Resistance of the washing machine.
Make R the subject of the equation
- R = P/I²................ Equation 2
From the question,
Given:
Substitute the these values into equation 2
- R = 420/1.75²
- R = 137.14 Ω
Hence, the internal resistance of the washing machine is 137.14 Ω.
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Answer:
created, destroyed, transforms
Explanation:
Energy cannot be created nor destroyed.
Energy is transformed from one form to another form.
- This is the postulate of the law of conservation of energy.
Energy is neither created nor destroyed simply implies that energy is not produce in any system. Nor is it destroyed.
What we have is energy transformation from one form to another.
Answer:
Here not any option is matching but only (A) option is near to our answer.
The frictional force is 126.046 N
Explanation:
Given:
Mass of bullet kg
Thickness of sand bag m
Initial bullet velocity
Final bullet velocity
According to the work energy theorem,
Work done by friction force is equal to change in kinetic energy.
Here we have to find friction force
N
Here not any option is matching but only (A) option is near to our answer.
Therefore, the frictional force is 126.046 N