According to law of reflection, the barber should place one mirror in front of the chair and two mirrors on the left and right sides of the chair perpendicular to the front mirror. According to law of shadows, the bulb should be placed above the chair.
What is the law of refraction?
The angle of incidence is equal to the angle of reflection.
- According to the law of reflection, when two mirrors are placed parallel to each other, then infinite images are formed. So if the bulb is placed between two parallel mirrors, then there will be more light.
- By using the front mirror and the side mirrors, the person can see his hair from all sides.
What is the law of shadow?
The length of the shadow of an opaque substance on the surface decreases as the angle between the blocked light ray and the surface plane increases.
- According to the law of shadows, when the light falls on an opaque substance perpendicularly, then no shadows are formed. So hairs will be easily visible to the barber.
- So the light should be placed above the chair.
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Answer:
Warming up may help reduce muscle soreness and lessen your risk of injury. Cooling down after your workout allows for a gradual recovery of preexercise heart rate and blood pressure.
Explanation:
Young child
your partner would want you to be happy, and a young child has the other parent and might not even remember the parent who passed..
The frequency of the wave has not changed.
In fact, the frequency of a wave is given by:
where v is the wave's speed and is the wavelength.
Applying the formula:
- In air, the frequency of the wave is:
- underwater, the frequency of the wave is:
So, the frequency has not changed.
Answer:
The current in primary coil is 2.08 A.
Explanation:
Given that,
Power = 500 W
Voltage = 16 kV
Number of turns = 80000
We need to calculate the number of current
Using formula of voltage
Put the value into the formula
We need to calculate the current in secondary coil
Using formula of current
We need to calculate the current in primary coil
Put the value into the formula
Hence, The current in primary coil is 2.08 A.