Answer:
The answer is A
Explanation:
A large risk of tailgating is the collision avoidance time being much less than the driver reaction time. Driving instructors advocate that drivers always use the "two-second rule" regardless of speed or the type of road. During adverse weather, downhill slopes, or hazardous conditions such as black ice, it is important to maintain an even greater distance.
<span>A fire sprinkler contractors work with the following people:
</span>- <span>fire-related organizations: They collaborate with the local fire department and work under the supervision of an organization that ensures all protocols are followed, from the application of the permit to the installation and right down to the inspection and maintenance. Example of which is the National Fire Protection Association (NFPA) in the United States.
- building-code organizations: There are national and local building codes, and this includes fire prevention. Fire sprinkler contractors should also follow these standards.
- certified fire inspectors: These are people certified by the local fire department or an authorized organization, like the NFPA, to inspect the building before and after the installation of the fire sprinkler
- manufacturers and suppliers: Fire sprinkler contractors directly work with manufacturers or direct suppliers to meet their specific needs when it comes to quantity and other specifications and also to minimize the cost.
- engineers and specialized plumbers: These engineers do the hydraulic calculations, which means determining the amount of water required to efficiently control a fire through a certain medium, which in this case is the fire sprinkler. They closely work with specialized plumbers to take care of the piping designs, materials, and installation.
- insurance companies: Fire sprinkler contractors also work with insurance companies to cover the cost of damages in case accidents happen. The scope of the insurance varies per contract. </span>
Frequency has nothing to do with amplitue, although it is inversely (meaning as one increases the other decreases) related to wavelength. the greater the frequency, the shorter the wavelength, and the smaller the frequency the longer the wavelength. Since wave X has a gretaer frequency, it has a D. Shorter wavelength.
Answer:
Ф = 142.674 degree
Ф = 2.490131057 rad
wavelength = 0.396316 λ
Explanation:
Given data
combined wave having an amplitude 0.64 times
to find out
answer in degrees, radians, and fraction of the wavelength
solution
let us consider these two wave equation
Asin(ωt) and the Asin (ωt + Ф)
and here Ф is phase difference
so we say
resultant wave is
Y = Asin(ωt) + Asin (ωt + Ф) = Asin(ωt + Ф/2) cos ( Ф/2)
so Y = A' sin(ωt + Ф/2)
we know that here resultant wave amplitude is 2A cos ( Ф/2)
so
put A= 0.64 A
so 2Acos ( Ф/2) = 0.64 A
and Ф/2 = 71.3370
Ф = 142.674 degree
Ф = 2.490131057 rad
so wavelength is 2.490131057 / 2π
wavelength = 0.396316 λ