Answer:
The frequency of an ocean wave is 15 Hz.
Explanation:
We are given with, the speed of an ocean wave is 45 m/s. Its wavelength is 3 m
It is required to find the frequency of an ocean wave.
The speed of a wave is given in terms of frequency and wavelength as :
,
f = frequency of ocean wave
So, the frequency of an ocean wave is 15 Hz.
Answer:
Firstly they are, by design, easy to use in most scientific and engineering calculations; you only ever have to consider multiples of 10. If I’m given a measurement of 3.4 kilometres, I can instantly see that it’s 3′400 metres, or 0.0034 Megametres, or 3′400′000 millimetres. It’s not even necessary to use arithmetic, I just have to remember the definitions of the prefixes (“kilo” is a thousand, “megametre” is a million, “milli” is a thousandth) and shift the decimal point across to the left or the right. This is especially useful when we’re considering areas, speeds, energies, or other things that have multiple units; for instance,
1 metre^2 = (1000millimetre)^2 = 1000000 mm^2.
If we were to do an equivalent conversion in Imperial, we would have
1 mile^2 = (1760 yards)^2
and we immediately have to figure out what the square of 1760 is! However, the fact that SI is based on multiples of 10 has the downside that we can’t consider division by 3, 4, 8, or 12 very easily.
Secondly they are (mostly) defined in terms of things that are (or, that we believe to be) fundamental constants. The second is defined by a certain kind of radiation that comes from a caesium atom. The metre is defined in terms of the second and the speed of light. The kelvin is defined in terms of the triple point of water. The mole is the number of atoms in 12 grams of carbon-12. The candela is defined in terms of the light intensity you get from a very specific light source. The ampere is defined using the Lorentz force between two wires. The only exception is the kilogram, which is still defined by the mass of a very specific lump of metal in a vault in France (we’re still working on a good definition for that one).
Thirdly, most of the Imperial and US customary units are defined in terms of SI. Even if you’re not personally using SI, you are probably using equipment that was designed using SI.
Sue from Burkey and Keith from Baron will meet in 2 minutes
Answer: Option b
<u>Explanation:</u>
Time taken can be calculated when distance and the speeds are given. Here speeds of Keith and Sue are given. So, we have to find the relative speeds in order to calculate the time taken.
When two objects travel in same direction the relative speed will be the difference between speeds. Similarly when two objects travel in opposite direction, the relative speed will be the sum of given speeds.
Given:
Speed of Sue from Burkey is 6 km/hr and speed of Keith from Baron is 3 km/hr.
The distance between Burkey and Baron is 300 m.
From the formula, 
where d is distance,s is speed and t is time
It can be derived that, 
s = sum of given speeds = 3 km/hr + 6 km/hr = 9 km/hr
d = 300 m = 0.3 km
Answer:
Oceanic part of this layer has a relatively homogeneous composition, while the other part is less uniform in composition
Explanation:
Your question is base on the earth crust which is either oceanic crust or continental.
The earth Lithosperic layer is divided into two part namely the oceanic crust and the continental crust.
The oceanic crust is more uniform in composition than the continental crust because of the kind of earth events that is predominant here. For example sea floor spreading . The oceanic crust is composed dominantly of Mafic rocks. The Mafic rocks are extrusive igneous rocks. This rocks are formed when magma intrudes into the ocean surface, due to rapid cooling this rocks solidified quickly to form these rocks that are mainly basaltic. The oceanic rocks are dominantly basaltic. The basaltic dominance makes the oceanic crust relatively homogeneous in composition.
Events like sea floor spreading whereby the oceanic floor diverge forming two parts are one factors that causes mantle materials(molten magma) to reach the surface to form this basaltic rocks. The separating point, the mid oceanic ridges is where new crust are formed from the up-welling of magma. As you move away from the mid oceanic ridges the rocks become older.
The demand for these things is very high. Everyone wants to have shelter, water, and food. However the demand for shelter is higher because water and food are more accessible.
