Answer: B) A machine that is 100% efficient
Explanation:
The second law of thermodynamics states that a machine will always be less than 100% efficient as heat is never converted completely into mechanical energy. Even an ideal, frictionless engine can't convert anywhere near 100% of its input heat into work.
Second law of thermodynamics states that any natural system tends to disorder. That is, the total entropy of the universe will tend to increase over time. Heat will alwyas from a hotter body to a colder body.
The soft iron is a magnetic material hence it became an induced magnet and attracted the blade.
<h3>What is a magnetic substance?</h3>
The term magnetic substances is a substance that can be attracted b a magnet. Now we know that the soft iron is a magnetic material hence it became an induced magnet and attracted the blade.
Recall that a magnetic substance is a substance that can be attracted by a magnet. Wood can not be attracted by a magnet but soft iron cash attracted by a magnet hence it is a magnetic substance.
This is not possible in the case of the wooden block since it is not magnetic as such the the razor blade on the wooden block was attracted to the magnet while the other on the soft iron was not.
Learn more about magnetism:brainly.com/question/2841288
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<span> force of 10.0 N
</span>
<span>distance of 0.9 m
w=f*d
w=10*0.9
=9.0 j</span>
Answer:
The angle is 25.34°.
Explanation:
Given that,
Wave length = 650 nm
Angle = 68.0°
We need to calculate the distance
For a diffraction grating
We need to calculate the angle
Using formula for angle
Hence, The angle is 25.34°.
