First km/h to m/s:
m/s = km/h / 3.6
m/s = 72 / 3.6
m/s = 20
Now, use the formula:
Vf = Vo + at
Clear t:
t = (Vf - Vo) / a
Replace:
t = (30 m/s - 20 m/s) / 0.5 m/s²
Resolving:
t = 10 m/s / 0.5 m/s²
t = 20 s
It will take <u>20 seconds.</u>
Sm = small piston
la = large piston
P=F/A
P=15000/(20^2)π
F of sm = PA
= (75/2π)•((8^2)π)
= (75•64)/2
= 4800/2
= 2400N
We already know the pressure but giving it in an approximate decimal form, to two significant figures (since that's what your supplied precision is at):
a) 12 Pa
b) 2400 N
Answer:
False
Explanation:
Visible light is composed of radiation of wavelengths between 400 and 700 nm. The sensitivity of the human eye depends on the wavelength and has a maximum at 550 nm. Some people are able to perceive from 380 to 780 nm.
The electromagnetic energy in a particular wavelength λ (in a vacuum) has an associated frequency f and a photonic energy E. Thus, the electromagnetic spectrum can be expressed in terms of any of these three variables, which are related by equations.
Thus, high frequency electromagnetic waves have a short wavelength and high energy; Low frequency waves have a long wavelength and low energy.
To calculate the energy of a photon the Planck formula is used is E = h · v, where E is the energy, h the Planck constant and v the frequency (Hz or s-1). Where the frequency f is equal to the speed of the wave, divided by the wavelength λ
.
That said we can say that it is false because although the red light has a longer wavelength than the blue one, in turn it has a lower energy than the blue light.
Answer:
A digital signal picks up noise, but is still reliable.
Explanation:
