Answer:
Explanation:
Given that,
The peak wavelength is
λp = 475nm
Then, we want to find the temperature,
From Wein's displacement law,
When the maximum is evaluated from the Planck radiation formula, the product of the peak wavelength and the temperature is found to be a constant (k = 2.898 ×10^-3 mK)
So, applying this we have
λp•T = 2.898 ×10^-3
T = 2.898 × 10^-3 / λp
T = 2.898 × 10^-3 / 475 × 10^-9
T = 6101.05 K
Answer:
57.1 N
Explanation:
The force of friction experienced by the sled is given by:
where
is the coefficient of friction
N is the normal reaction exerted by the snow on the sled
For a flat surface, the normal reaction is equal to the weight of the object:
N = mg
where
m = 53.0 kg is the mass of the sled
g = 9.8 m/s^2 is the acceleration of gravity
Substituting the second equation into the first one, we find:
Cant guarantee that this is the right answer, but it makes sense to me. Liquids generally dont have as much friction because theyre molecules arent packed as tight as solids and a lot of surfaces are warmer than ice, so the bottom of ice melts to water, making it more slippery and have less friction
Out of these, I have to say the answer is "Washing fruit"
Answer:
Commutator is a ring which reverse the direction of current in AC circuit so that the coil connected to it will continuous to move in the same direction.
Explanation:
In motors there exist a coil which is rotated due to torque of magnetic field when current flow through it. Since AC current is used to run the motor so we know that AC current changes its direction after half cycle.
So here commutator plays an important role to reverse the direction of current after every half cycle so that the current goes in same direction always into the coil.
This will produce a constant direction torque on the coil so that it will rotate in same sense always.
So commutator role is to provide same direction current to the coil by reversing its direction after every half cycle