Answer:
I like why don't we too, Prettymuch, Bts, Blackpink. Ateez, Staykids, etc...
Explanation:
Answer:
Both technicians A and B are correct.
Explanation:
Variable valve timing is the process of changing the time of a valve lift in the internal combustion engine. This process is usually used to enhance the performance,emissions or the efficient consumption of fuel.
Now a days, variable valve timing is commonly used with a combination of variable valve lift systems in internal combustion engines.
Therefore, technician A(changing the exhaust valve timing how to reduce exhaust emissions) and technician B (it changes in the intake valve timing helped increase low speed torque) are correct.
Answer:
Horizontal acceleration will be
Explanation:
We have given radius of track = 180 m
velocity = 30 m/sec
Total acceleration 
The centripetal;l acceleration which is always normal to the velocity also known as normal acceleration is given by 
So the tangent acceleration will be 
Answer:
0.00692 cm/Sec
Explanation:
Please kindly check attachment for the step by step solution of the given problem.
Answer:
The differential equation and the boundary conditions are;
A) -kdT(r1)/dr = h[T∞ - T(r1)]
B) -kdT(r2)/dr = q'_s = 734.56 W/m²
Explanation:
We are given;
T∞ = 70°C.
Inner radii pipe; r1 = 6cm = 0.06 m
Outer radii of pipe;r2 = 6.5cm=0.065 m
Electrical heat power; Q'_s = 300 W
Since power is 300 W per metre length, then; L = 1 m
Now, to the heat flux at the surface of the wire is given by the formula;
q'_s = Q'_s/A
Where A is area = 2πrL
We'll use r2 = 0.065 m
A = 2π(0.065) × 1 = 0.13π
Thus;
q'_s = 300/0.13π
q'_s = 734.56 W/m²
The differential equation and the boundary conditions are;
A) -kdT(r1)/dr = h[T∞ - T(r1)]
B) -kdT(r2)/dr = q'_s = 734.56 W/m²