[Find the attachment]
Power is a fundamental dimension. a) True b) False
1 answer:
Answer:
The statement is false.
Explanation:
Fundamental dimensions are those dimensions that cannot be derived from any combination of physical quantities in the universe and these quantities act as base quantities from which all other physical quantities are derived.
The fundamental dimensions in the nature are:
1) Length (L)
2) Mass (M)
3) Time (T)
4) Current (A)
5) Temperature (K)
6) Amount/ Quantity (MOLE)
7) Luminous intensity (CANDELA)
All the other physical quantities are derived from a combination of these fundamental dimensions.
Power can be represented as and hence it is a derived quantity.
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Answer:
Power required to overcome aerodynamic drag is 50.971 KW
Explanation:
For explanation see the picture attached
Answer:
The time required is 10.078 hours or 605 min
Explanation:
The formula to apply here is ;
K=(d²-d²₀ )/t
where t is time in hours
d is grain diameter to be achieved after heating in mm
d₀ is the grain diameter before heating in mm
Given
d=5.5 × 10^-2 mm
d₀=2.4 × 10^-2 mm
t₁= 500 min = 500/60 =25/3 hrs
t₂=?
n=2.2
First find K
K=(d²-d²₀ )/t₁
K={ (5.1 × 10^-2 mm)²-(2.4 × 10−2 mm)² }/ 25/3
K=(0.051²-0.024²) ÷25/2
K=0.000243 mm²/h
Re-arrange equation for K ,to get the equation for d as;
d=√(d₀²+ Kt) where now t=t₂