Answer:
120°
Explanation:
Given forces with magnitude F and F
Applying the parallelogram law of vector
Where resultant is given as :
R = √(A^2 + B^2 + 2ABCos Ф
WHERE A and B are two forces with angle Ф
F =√(F^2 + F^2 + 2F * F Cos Ф
Square both sides
F^2 = F^2 + F^2 + 2F^2 CosФ
F^2 - 2F^2 = 2F^2 CosФ
- F^2 = 2F^2 Cos Ф
Divide both sides by 2F^2
- 1 / 2 = CosФ
Cosine(theta) = - 1/2
Ф = cosi^-1 (-1/2)
Ф = 120°
Answer:
The correct answer is from Tech B.
Explanation:
The relay is an electromagnetic device, which is stimulated by a very weak electrical current to open or close a circuit. It functions as a switch controlled by an electrical circuit in which, by means of a coil and an electromagnet, a sequence of one or several contactors is activated that allow to open or close other electrical circuits independent of the one that controls it.
Have a nice day!
Answer:
Explanation:
Answer:
Explanation:
mass of book, m = 2.10 kg
diameter of pulley, = 0.170 m
radius of pulley, R = 0.085 m
mass of hanging book, m' = 3 kg
initial velocity, u = 0 m/s
distance, s = 1.2 m
time, t = 0.9 s
Let a be the acceleration of the system and T and T' is the tension in the string which is horizontal and vertical respectively.
Use second equation of motion
s = ut + 0.5 at²
1.2 = 0 + 0.5 x a x 0.9 x 0.9
a = 2.96 m/s²
(a) Use second equation of motion
T = ma
T = 2.10 x 2.96
T = 6.216 N
m'g - T' = m'a
3 x 9.8 - T' = 3 x 2.96
T' = 20.52 N
(b) Let the moment of inertia of the pulley is I.
So, (T' - T)R = I x α
(20.52 - 6.216) x 0.085 = I x 2.96 / 0.085
I = 0.035 Kgm²
Answer:
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