It’s D. This is because having oil changes often, makes the care for your car better. I hope this helps.
Answer:
The power is reduced by 19 percent.
Explanation:
The formula of power is given by:
In which V is the voltage, and R is the resistance.
I am going to use R = 1 in both cases.
With the original voltage, V = 1, we have
With the modified voltage, V = 0.9, we have:
So the power is reduced by 1-0.81 = 0.19 = 19 percent.
Answer:
NOT WISE
Explanation:
given,
T₁ = 87⁰C = 273 + 87 = 360 K
T₂ = 27⁰C = 273 + 27 = 300 K
work output given = 10 J
efficiency will be equal to :
output delivery = η ₓ input
= 0.166 ₓ 40
= 6.66 J
hence, the output of new engine is less than the old one so, investing in new engine will not be feasible.
Answer:
Q=260.96W/m
Explanation:
you should raise the heat transfer equation between the inner part of the tube and the outer part taking into account the convection and conduction resistances
as they are asking us for the heat per unit length, then the conduction and convection resistances are like this
Rh=1/(hDpi)
Rc=ln(De/Di)/2piK
I attached the complete procedure