Answer:
Net torque, 
Explanation:
It is given that,
Initial angular speed of the blade, 
Final angular speed of the blade, 
Time, t = 18 s
Radius of the disk, r = 0.13 m
Mass of the disk, m = 0.4 kg
We need to find the net torque applied to the blade. We know that in rotational mechanics the net torque acting on an object is equal to the product of moment of inertia and the angular acceleration such that,
The moment of inertia of the disk, 
Negative sign shows that the net torque is acting in the opposite direction of its motion. Hence, this is the required solution.
Answer:
(E) Second law of thermodynamics
Explanation:
The second law of thermodynamics can be understood according to Clausius' words: In an isolated system, no process can occur if a decrease in the total entropy of the system is associated with it. These processes are associated with energy transformations, in which a variable is introduced, called entropy that indicates the notion of disorder. Therefore, in any isolated process, the disorder can only grow.
A relationship exists and the numbers cause one another can be said about two numbers that have either a positive or negative correlation
Option : C
<u>Explanation:</u>
When two numbers have positive correlation, they move in the same direction. If the first variable increases, the second one also increases and if one variable decreases the other one also decreases.If the two numbers have negative correlation, the two numbers move in opposite directions.
A relationship exists between two numbers and the number cause one another. A correlation means that changing one variable affects the other. Correlation among variables need not necessarily imply causation. Positive correlations are mostly used in Finance and stock markets.
Answer:
m = 48.93kg
The load is 48.93kg.
Explanation:
Given;
Power P = 100watts
Efficiency e = 60% = 0.60
distance d = 10 m
time taken t = 80 s
Acceleration due to gravity g = 9.81m/s
Workdone W can be expressed as;
W = ePt = Fd = mgd
ePt = mgd
Making m the subject of formula;
m = ePt/gd
Substituting the values;
m = (0.60×100×80)/(9.81×10)
m = 48.93kg
The load is 48.93kg.
For one thing, hydrogen gas or fuel is really expensive compared to present diesel and gasoline. There's no point in actually investing in them since economy will not improve otherwise. Gasoline stations will also have to adjust to how tricky hydrogen gas will be to support and store with ease. It's dangerous also to the driver, passengers and our environment.
