I was going to beg off until tomorrow, but this one is nothing like those others. Why, at only 40km/hr, we can ignore any relativistic correction, and just go with Newton.
To put a finer point on it, let's give the car a direction. Say it's driving North.
a). From the point of view of the car, its driver, and passengers if any, the pole moves past them, heading south, at 40 km/hour .
b). From the point of view of the pole, and any bugs or birds that may be sitting on it at the moment, the car and its contents whiz past them, heading north, at 40 km/hour.
c). A train, steaming North at 80 km/hour on a track that exactly parallels the road, overtakes and passes the car at just about the same time as the drama in (a) and (b) above is unfolding.
The rail motorman, fireman, and conductor all agree on what they have seen. From their point of view, they see the car moving south at 40 km/hr, and the pole moving south at 80 km/hr.
Now follow me here . . .
The car and the pole are both seen to be moving south. BUT ... Since the pole is moving south faster than the car is, it easily overtakes the car, and passes it . . . going south.
That's what everybody on the train sees.
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Finally ... since you posed this question as having something to do with your fixation on Relativity, there's one more question that needs to be considered before we can put this whole thing away:
You glibly stated in the question that the car is driving along at 40 km/hour ... AS IF we didn't need to know with respect to what, or in whose reference frame. Now I ask you ... was that sloppy or what ? ! ?
Of course, I came along later and did the same thing with the train, but I am not here to make fun of myself ! Only of others.
The point is . . . the whole purpose of this question, obviously, is to get the student accustomed to the concept that speed has no meaning in and of itself, only relative to something else. And if the given speed of the car ...40 km/hour ... was measured relative to anything else but the ground on which it drove, as we assumed it was, then all of the answers in (a) and (b) could have been different.
And now I believe that I have adequately milked this one for 50 points worth.
Standing waves can be thought of as a sin wave and a cos wave overlapping each other. They go in different direction hence Cis correct
Wave interference can be thought of as the opposite of destructive ---> constructive anda hencd meet and interact on the same medium such that answerBis correct
You are given a fixed rate of 15.9 cm³/s. You are also given with the amount of volume in 237 cm³. Through the approach of dimensional analysis, you can manipulate through operations such that the end result of the units must be in seconds. The solution is as follows:
I think the correct answer would be horizontal exchanges or market. It is a type of market wherein a service or a product would meet a need of a very wide range of consumers from different sectors. Hope this answers the question. Have a nice day.
In the diagram, the ship send sound(?) waves to the water, to determine if there is anything there. If there is something like a sunken ship shown in the diagram, the waves return in a shorter time hence you can understand if theres something or now. This is the principle of radars and sonars.
They are used to separate mixtures into their component compounds but can no usually be used to deprecate compounds into chemical elements or simpler compounds