When working with electric charges, what symbol is used in equations to represent the electric field of an object?
2 answers:
Answer:
E = electric field
Explanation:
The electric force per unit charge is called electric field of an object. It can be also defined as the space surrounded by a charged particle. The mathematical definition of electric field is given by :
Where
Electric force = F
Charge = q
Electric field = E
So, electric field is represented by a symbol E. Hence, the correct option is (b).
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Answer:
The speed of the airplane relative to the air is 209.47km/hr
Explanation:
Whenever we are solving a physics problem, it's really useful to start by drawing a diagram of the problem (See picture attached). It will help us visualize the problem better.
Now, we know that the plane flew for an amount of time of 15 minutes. For our dimensions to be the same, we need to turn those 15min to hours, like this:
Once our time is rewritten as hours, we can now calculate the velocity towards north of the plane.
the plane traveled a distance to the north of 48km so the velocity is:
so
V=192km/hr j
Now, we can calculate the x and y-components of the velocity of the wind. The problem states that the wind is blowing at 42km/hr at an angle of 19° south of east, so the x and y-components of the velocity of the wind are:
and
So the velocity of the wind can be expressed as a vector as:
Once we know this, we can find the velocity of the plane with respect of the wind on x and on y:
and
So the velocity of the plane with respect to the wind can be rewritten as:
Since the problem asks us to find the speed of the plane with respect to the wind, this means that we need to find the magnitude of the velocity, since the speed is a scalar defined to be the magnitude of the velocity.
so:
speed= 209.47 km/hr
Therefore, the speed of the airplane relative to the air is 209.47km/hr
