Answer:
B
Explanation:
It becomes lighter so it rises
Answer: c) 90 m/s
Explanation:
Given
Invest velocity, v1 = 250 m/s
Inlet specific enthalpy, h1 = 270.11 kJ/kg = 270110 J/kg
Outlet specific enthalpy, h2 = 297.31 kJ/kg = 297310 J/kg
Outlet velocity, v2 = ?
0 = Q(cv) - W(cv) + m[(h1 - h2) + 1/2(v1² - v2²) + g(z1 - z2)]
0 = Q(cv) + m[(h1 - h2) + 1/2(v1² - v2²)]
0 = [(h1 - h2) + 1/2(v1² - v2²)]
Substituting the values of the above, we get
0 = [(270110 - 297310) + 1/2 ( 250² - v²)
0 = [-27200 + 1/2 (62500 - v²)]
27200 = 1/2 (62500 - v²)
54400 = 62500 - v²
v² = 62500 - 54400
v² = 8100
v = √8100
v = 90 m/s
Vectors is the answer. scalars only multiply the value to another magnitude.
First let's convert everything into SI units.
The length of the blade is 3 inches. Keeping in mind that 1 inc=0.025 m, we have
The angular speed is 600 revolutions per minute. Keeping in mind that
and
, the angular speed becomes
And so, the linear velocity of the edge of the blade is equal to
Different theories in science rely on the current available knowledge that has been obtained through a certain way of data collection/that has used certain technology to obtain such data. With new technology, new datasets can be obtained that perhaps are not in line with previous theories. By improving technology, new datasets can be obtained and through this theories can be advanced, improved and developed.
