Answer:
Explanation:
Knowledge of vectors is important because many quantities used in physics are vectors. If you try to add together vector quantities without taking into account their direction you'll get results that are incorrect.
Some of the key vector quantities in physics: force, displacement, velocity, and acceleration.
An example of the importance of vector addition could be the following:
Two cars are involved in a collision. At the time of the collision car A was travelling at 40 mph, car B was travelling at 60 mph. Until I tell you in which directions the cars were travelling you don't know how serious the collision was.
The cars could have been travelling in the same direction, in which case car B crashed into the back of car A, and the relative velocity between them was 20 mph. Or the cars could have been travelling in opposite directions, in which case it was a head on collision with a relative velocity between the cars of 100 mph!
I believe it is C. Correct me if I’m wrong.
Answer:
Explanation:
Given
Height of boy 
Distance of boy from mirror 
Distance of house is 
We know angle of incident and angle of reflection is same therefore
thus 
Also 
From 1 and 2 we got
Answer:
As shown above, the magnetic field is strongest near to the poles of the magnet were the lines of flux are more closely spaced. The general direction for the magnetic flux flow is from the North ( N ) to the South ( S ) pole.
Explanation:
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Answer:
B. tell the time of day
Explanation:
Solar watch. It was one of the few ways to measure time in antiquity, but it has not ceased to be a useful and also curious instrument. Nowadays, it not only allows us to know the time and day of the year, but it is also used to know some characteristics of the Sun, even with the absence of solar radiation, and provides its aesthetic value. With a suitable design, the solar clock allows to know, for example, the sunrise and sunset times for any day of the year; the duration of day and night; at what time, according to the date, direct solar radiation affects each wall according to its North, South, East or West orientation; and the position of the Sun at any time and day of the year, either by day or by night. It also allows orientation, since the solar clock indicates the position of the Polar Star.
The solar clock can have different shapes, commonly on vertical, horizontal or inclined flat surfaces. A solar clock can be made on curved and irregular surfaces, and even inside a closed restaurant or lounge. In the latter case it would not be the shadow that would give the time, but a solar ray that is allowed to enter the room
