The temperature scale which starts at absolute zero is the Kelvin scale. The correct option in respect to the given question is the last option. William Thompson was the British scientist and inventor that invented the Kelvin scale. William Thompson was also popularly known as Lord Kelvin.His discovery of the Kelvin scale is considered one among the three best scales in use for measuring temperatures.Each measuring unit of this scale is never called a degree but a Kelvin. This specialized scale gives the option of measuring temperature in both centigrade and Fahrenheit.
Less than. A machine should have equal or more output than input to have a high efficiency. :)
Answer:
The Power output from Turbine B with the doubled blade will be X4 of the power output from Turbine A.
Explanation:
The Power generated by a wind turbine is governed by the equation:
P=0.5ρAV³
Where ρ= Air Density
A= Swept Area of the Blade =πr²
V= Wind Velocity
If they are subjected to the same wind, Air Density and Wind Velocity will be equal
For both turbines,
Let Air Density=1
Wind Velocity=1
Power from Turbine A = 0.5X1XπX1²=0.5π
Power from Turbine B (radius=2) = 0.5X1XπX2²=2π
Power from Turbine B/Power from Turbine A = 2π/0.5π=4
Explanation:
a)
The circumference of the path is:
C = 2πr
C = 2π (0.235 m)
C = 1.48 m
Velocity = displacement / time
v = 1.48 m / 1.95 s
v = 0.757 m/s
b)
1 rev / 1.95 s = 0.513 Hz
c)
1 rev / 1.95 s × (2π rad / rev) = 3.22 rad/s
Answer:
14 cm
Explanation:
F = (frac{uv}{u – v})
F = +ve
v = -ve
30 = (frac {25 {times} (-v)}{25 – (-v)})
v = (frac {25 {times} (-v)}{25+v})
v = 14cm
(Note that either negative or positive values go to show the positioning and hence, they are not a strong necessity in your final answer.)
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Now this question could turn out to be easy for you!!