Answer:
B= -40
The negative sign indicates the reverse direction to that of vector A.That is it is in the third quadrant.
Explanation:
Th resultant vector is obtained by adding the two vectors A and B
A + B= AB
25 + B= -15
25+ 15= -B
-B = 40
B= -40
Vector B has a magnitude of 40 and points in the opposite direction to that of vector A. The negative indicates the opposite direction.
When we reverse the vector B for adding we place a negative sign with the magnitude.
A vector is quantity defined by magnitude and direction. If the direction is left out it becomes a scalar.
Answer:
Frequency heard by the police is 1336 Hz
Explanation:
As we know that the speed of sound in air is given as
now we know that
t = 35 degree C
so we have
now we know that if source and observer moves relative to each other then the observed frequency by the observer is given as
Answer:
Electric Field at a distance d from one end of the wire is
Electric Field when d is much grater than length of the wire =
Explanation:
Given:
- Total charge over the length of the wire = Q
- Length of the wire = L
- Distance from one end of wire at which electric field is needed to find=d
Let dE be the Electric Field due to the small elemental charge on the wire at a distance x from the one end of the wire and let be the charge density of the wire
Now integrating it over the entire length varying x from x=d to x=d+L we have and replacing we have
When d is much greater than the length of the wire then we have
1+\dfrac{L]{d}≈1
So the Magnitude of the Electric Field at point P =
Answer:
-6C
Explanation:
We are given that
Charge on an object,Q=-8C
Charge on one piece of object=
We have to find the exact charge of the other piece.
Let q be the charge of second piece of object.
By conservation of charge
Initial charge=Final charge
Substitute the values then we get
Hence, the exact charge of the other piece=-6C
Answer:
I chose c because it is the greater slope at point c