Answer:
Ideal machines are said to have parts which are weightless , frictionless and strings if any are inextensible. Practical machines have parts which have weights, friction and it causes some loss of work done.
Explanation:
Answer:its B
Explanation:
The suns gravity keeps the planets in their gravitational orbit.
Answer:
The the angle between the axis of polarization of the light and the transmission axis of the analyzer is 52⁰.
Explanation:
Given;
I₀ as incident light intensity
The intensity of a linearly polarized light passing through a polarizer is given by Malus' law:
I = I₀Cos²θ
where;
I is the intensity after passing through the analyzer
θ is the the angle between the axis of polarization of the light and the transmission axis of the analyzer.
If 38% of the total intensity is transmitted, then I = 38% of I₀ = 0.38I₀
0.38I₀ = I₀Cos²θ
0.38 = Cos²θ
Cosθ = √0.38
Cosθ = 0.6164
θ = Cos⁻¹ (0.6164)
θ = 51.95° = 52⁰
Therefore, the angle between the axis of polarization of the light and the transmission axis of the analyzer to allow 38% of the total intensity to be transmitted is 52⁰.
An electromagnet is made from a coil of wire which acts as amagnet when an electric current passes through it. Often anelectromagnet is wrapped around a core of ferromagnetic material like steel, which enhances the magnetic field produced by the coil.
Answer:
Explanation:
when the surface is super smooth, the light reflects in all the same. which makes a good reflection. Like how a very calm lake can look like a mirror. the water gets very very smooth. or a mirror is very smooth too. If the surface reflects like more randomly.. like when a lake is rough or wind is blowing over it .. and there a small waves it's not a good "even" reflection.
