The bob passes the lowest point <em><u>twice</u></em> during every complete swing.
The period of this pendulum is <em>0.2 seconds</em>.
Frequency = 1/period
Frequency = 1/0.2 sec
<em>Frequency = 5 Hz.</em> (A very very very short, fast pendulum.)
Note:
The mass of the bob, the angle from the vertical (as long as it's small), the color of the string, and the day of the week have no effect on the period. Only the length of the string has.
Answer:
175s
Explanation:
time it takes sunlight to reach the earth in vacuum
C=light speed=299792458m/s
X=1.5x10^8km=1.5x10^11m
c=X/t
T1=X/c
T1=1.5X10^11/299792458=500.34s
time it takes sunlight to reach the earth in water:
First we calculate the speed of light in water taking into account the refractive index
Cw=299792458m/s/1.349=222233104.5m/s
T2=1.5x10^11/222233104.5m/s=675s
additional time it would take for the light to reach the earth
ΔT=T2-T1=675-500=175s
They both can be found in an atom, but nuetrons have no charge, while protons have a positive charge
