Answer:
A short circuit is an electrical circuit that allows
Explanation:
Answer:
A valence number of 1 means that an alement will generally react to lose one electron to obtain a full outer shell.
Group two elements are assigned a valence number of 2. A valence number 2 means that a group two elements will generally react to lose two electrons to obtain a full outer shell.
Explanation:
Hope it helps
I don't know
but a single substance is any sample of the known elements found in the periodic table of elements elements are made up of atoms of the same kind and cannot be decomposed by any chemical means into any other simpler elements.
Answer:
14.3 km
Explanation:
We motion of the car consists is split in two parts:
- A first motion 12 km north
- A second motion 7.8 km west
The two motions are in directions perpendicular to each other: this means that we can find the magnitude of the net displacement by using Pythagorean's theorem, therefore:
where
Substituting, we find
Answer:
Explanation:
Given that,
Ship send 1200Hz down in to the water.
Echo is heard after 3secs
f = 1200Hz
t = 3seconds
Using wave equation
V = fλ
In echo, two distance is travelled before echo can be heard, then we have
V = 2λ × f
Making d subject of the formula
λ = V / ( 2 × f)
So,
As frequency is reduced by half, the wavelength is double.
Notice
That the sound will travel the same distance but only the speed and the frequency will change.
So, the sound would travel twice as fast, so it would take half as much time to return