A joule is one Newton of force applied over a meter.
For every meter, the brakes put 240000N of force (N=Newtons).
For 40m, multiply the Newtons by 40.
240000N*40=9600000N
Answer: True
Explanation: Because of the way this water cycle has always circulated our planet, there is indeed a chance that the water in your glass is the same water that thirsty dinosaurs were drinking about 65 million years ago
Reason : Speed of Sound is more than the train approaching
Answer:
The frequency of the sound wave in the helium in the stopped pipe is 749.25 Hz.
Explanation:
Given that,
Length = 1.00 m
Temperature T = 20°C
Speed of sound = 999 m/s
We need to calculate the frequency of the sound wave in the helium in the stopped pipe
Using formula of frequency
Put the value into the formula
Hence, The frequency of the sound wave in the helium in the stopped pipe is 749.25 Hz.
The frequency of the
wavelength photon is given by
where c is the speed of light.
The energy of this photon is
where h is the Planck constant.
The energy of the first photon is twice that of the second photon, so
And so now by using again the relationship betwen energy and frequency, we can find the frequency of the first photon:
and its wavelength is
So, we see that the wavelength of the first photon is exactly half of the wavelength of the second photon (622 nm).