Answer:
thats really hard how could you answerthis hhhhhhh
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
Answer:
Tech A is correct.
Explanation:
An electric brake controller is a device that sends a signal to the trailer via vehicle's brakes. This reduces the wear and tear on the vehicle brakes. As a result, the vehicle stops.
Tech A says that bleeding an electronic brake control system is just like bleeding a non-electronic brake control system.
So,
Tech A is correct.
Answer:
Yes, it is Reasonable.
Explanation:
The problem states that by using a new sensor, the result is 60 million dynes.
Converting the force into Newtons, by using the formula,
1 newton = 10⁵ dynes,
i.e, 1 million dynes = 10 newtons.
we get,
60 million dynes = 60 x 10 newtons = 600 newtons.
The result using a new sensor is reasonable because atmosphere exerts a force of about 10 newtons on us and 600 newtons is just 60 times of it.
Thus 600 N can be applied by the hammer on the nail and it is reasonable.
