Answer:
x=1.25m
Explanation:
The <em>Center of mass </em>of the system is defined as the point where whole mass of the body is appeared to be concentrated.
The center of mass of the system is given by
x= 
where m1 is mass of man =60 kg
m2 mass of board =20 kg
let the man be at the origin x1 =0 , x2 =5m
by substituting in above formula
x =
= 
=1.25 m
x=1.25m
So the center of mass of the system is at 1.25 m from man.
L<span>ever; inclined plane</span>
Answer:
AM broadcasts occur on North American airwaves in the medium wave frequency range of 525 to 1705 kHz (known as the “standard broadcast band”). The band was expanded in the 1990s by adding nine channels from 1605 to 1705 kHz.
Answer:
10 m/s
Explanation:
The speed of a wave is given by
where
is the wavelength
f is the frequency
For the wave in this problem,
- The frequency is given by the number of oscillations per second, so
- The wavelength is
So, the wave speed is
Answer:
Velocity v = 120 km/h
Time t = 30 s
Let Distance be d
First, we need to convert 120 km/h into m/s
1 km/h = (1000m)/(3600 s) = 5/18 m/s
So, 120 km/h = 120×5/18 m/s
So, v = 200/6 m/s
Now, velocity = distance/time
So d = v×t
So, d = (200/6) × 30
So, d = 1000 m
So, d = 1 km
Thus, distance travelled is 1 km
Explanation:
