Explanation:
The text reads;
"The two flat mirrors X and Y face each other and form a 60-degree angle. One light goes to X with the angle coming 60 degrees until it is reflected Y. Calculate the angle of reflection of the light leaving Y".
There are 5 dwarf plabets
Answer:
Un automóvil deportivo de 921 kg se mueve hacia la derecha con una rapidez de 29.0 m / s.
Explanation:
Answer
The current is 0.83 amps .
Option (C) is correct .
Explanation :
Formula for parallel resistors
As given
A combined circuit has two resistors in parallel (10.0 ohms and 14.0 ohms) .
Putting all the values in the above
L.C.M of (10,14) = 70
As given
Another resistors in the series is 5.0 ohms .
Formula
Now by using the ohms law .
Where V is voltage , R is resistance and I is current .
As given
The power source is 9.0 volts .
V = 9 volts
Putting values in ohms law
I = 0.83 amps (Approx)
Therefore the current is 0.83 amps .
Option (C) is correct .
part a)
Vector a has magnitude 12.3 and its direction is west, while Vector b has unknown magnitude and its direction is north. This means that the two vectors form a right-angle triangle, so a and b are two sides, while a+b is the hypothenuse.
We know the magnitude of a+b, which is 14.5, so we can use the Pythagorean theorem to calculate the magnitude of b:
part b) The direction of the vector a+b relative to west can be found by calculating the tangent of the angle of the right-angle triangle described in the previous part; the tangent of the angle is equal to the ratio between the opposite side (b) and the adjacent side (a):
And the angle is
with direction north-west.
part c)
This is exactly the same problem as the one we solved in part a): the only difference here is that the hypothenuse of the triangle is now given by a-b rather than a+b. In order to find a-b, we have to reverse the direction of b, which now points south. However, the calculations to get the magnitude of b are exactly the same as before, since the magnitude of (a-b) is the same as (a+b) (14.5 units), therefore the magnitude of b is still 7.68 units.
part d)
Again, this part is equivalent to part b); the only difference is that b points now south instead of north, so the vector (a-b) has direction south-west instead of north-west as before. Since the magnitude of the vectors involved are the same as part b), we still get the same angle, , but this time the direction is south-west instead of north-west.