Answer:
v= 1.71 m/s
Explanation:
Given that
Distance between two successive crests = 4.0 m
λ = 4 m
T= 7 sec
T is the time between 3 waves.
3 waves = 7 sec
1 wave = 7 /3 sec
So t= 7/3 s
We know that frequency f
f= 1/t= 3/7 Hz
Lets take speed of the wave is v
v= f λ
f=frequency
λ=wavelength
v= 3/7 x 4 = 12 /7
v= 1.71 m/s
C-Non-metals. There are tons of them.
Theories develop over time as new Scientific evidence is discovered.
A law is what happens, a theory trys to explain why it happens. For example there is a gravitational force (law), the theroy of relitivity trys to explain why. it says that gravity is a warpiture in space and time created by all matter in the univerese.
ᶦ ʷʳᵒᵗᵉ ᵃˡˡ ᵗʰᵃᵗ^
hope it helped.Answer:
An endothermic reaction is the one that use : Chemical energy
Chemical energy refer to the energy that is stored within the bound of the compound (endothermic reaction absorb heat to produce energy)
hope this helps