Answer:
72 km
Explanation:
We are given that
John marker reads=239 km
John travels and reaches the marker=149 km
John retraces his path and reaches the marker=167 km
We have to find the John's resultant displacement from 239 km.
Displacement:The displacement is the distance between two positions.
By definition of displacement
John's resultant displacement from 239 km=239-167
John's resultant displacement from 239 km=72 km
Hence, John's resultant displacement from 239 km=72 km
displacement is the shortest distance travelled...
hence in this case the displacement will simply be 12m
Yeah, which one of the three
Answer:
Velocity, v = 0.239 m/s
Explanation:
Given that,
The distance between two consecutive nodes of a standing wave is 20.9 cm = 0.209 m
The hand generating the pulses moves up and down through a complete cycle 2.57 times every 4.47 s.
For a standing wave, the distance between two consecutive nodes is equal to half of the wavelength.
Frequency is number of cycles per unit time.
Now we can find the velocity of the wave.
Velocity = frequency × wavelength
v = 0.574 × 0.418
v = 0.239 m/s
So, the velocity of the wave is 0.239 m/s.
Cations are formed by losing electrons
Cations are basically positive ions
It's not lose or gain protons because atoms can't lose or gain protons. The protons don't move.
It's not gain electrons because electrons are negative. More electrons=more negative
If you can't remember cations are positive
CAT-ions are PAWS-itively charged
