Answer:
The instantaneous axis of rotation=
x = 0 ; z = 8.4 ft
Explanation:
Given:
Speed of helicopter, Vo= 120 mi/h, converting to ft/sec, we have:
= 176 ft/s
Angular velociyy, w = 220 rpm, converting to rad/sec, we have: 
The helicopter moves horizontally in the x direction at a speed of 120 mi/h, this means that the helicopter moves in the positive x direction at 120mi/h
To find the instantaneous axis of rotation of the main blades, we have:
Where Vc = 20.95 rad/s
Vo = 176 ft/s
= 8.4 ft
Therefore the axis of rotation=
x = 0 ; z = 8.4 ft
Question:
In a typical transmission line, the current I is very small and the voltage V is very large. A unit length of the line has resistance R.
For a power line that supplies power to 10 000 households, we can conclude that
a) IV < I²R
b) I²R = 0
c) IV = I²R
d) IV > I²R
e) I = V/R
Answer:
d) IV > I²R
Explanation:
In a typical transmission line, the current I is very small and the voltage V is very high as to minimize the I²R losses in the transmission line.
The power delivered to households is given by
P = IV
The losses in the transmission line are given by
Ploss = I²R
Therefore, the relation IV > I²R holds true, the power delivered to the consumers is always greater than the power lost in the transmission line.
Moreover, losses cannot be more than the power delivered. Losses cannot be zero since the transmission line has some resistance. The power delivered to the consumers is always greater than the power lost in the transmission.
Answer:
The face of the claw on the claw hammer is usually a smooth curve so as to improve the ease with which nails are removed when removing nails because as the nail held between the V shaped split claw is being pulled out from the wood, it slides more and more towards cheek, reducing the distance of the nail from the cheek which is the fulcrum, thereby increasing the mechanical advantage because the location of the hand on the grip remains unchanged
Explanation:
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