<span>Buddy, remember one formula.. speed=distance/time
your all problems will be solved.
in this case the answer is 5 km per hr</span>
THE MOTION IS GOOD BECAUSE IT MAKES THE BATTER IT THE BALL AND THE BATTER LINES UP THE BALL AND BAT AND HE HITS IT
Question 8
Silicon is a semi-conductor that are mostly used in electronic devices. From the choices give, silicon is applicable in t<span>ransistor, integrated circuit and diode. But the best answer that suits this question is (B) integrated circuit.
Question 9
Power is the rate of doing work. It is calculated as,
Power = workdone/time taken to do that work.
In electricity, power = current </span>×voltage
From ohm's law, V=IR
Where I⇒current and
R⇒ resistance.
∴Power = I²R
= 6²×5
= 180 Watts
The surface temperature of a red star is lower than the surface temperature of a yellow star.
Explanation:
For a red star, the peak of the wavelength of the emitted light is in the red spectrum, therefore the average peak wavelength is:
The corresponding temperature at the surface of the star can be found by using Wien's displacement law:
where
is a constant. Substituting, we find
For a yellow star, the peak of the wavelength of the emitted light is in the yellow spectrum, therefore the average peak wavelength is:
So we can use again the same equation to find the corresponding surface temperature of a yellow star:
Therefore, we see that the surface temperature of a red star is lower than the surface temperature of a yellow star.
Learn more about temperature:
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The sound is perceived as louder if the amplitude increases, and softer if the amplitude decreases. As the amplitude of the sound wave increases, the intensity of the sound increases. Sounds with higher intensities are perceived to be louder.
