Answer:21.18 m
Explanation:
Given
initial speed u=10 m/s
height of building h=22 m
time taken to complete 22 m
initial vertical velocity =0
Horizontal Distance moved
if rebecca stands in front of david at a distance of do and david perceives the position of rebecca at di, di will be +84 cm
<h3>What is focal length ?</h3>
How strongly light converges or diverges depends on an optical system's focal length, which is the inverse of optical power. A system with a positive focus length is said to converge light, whereas one with a negative focal length is said to diverge light.
focal length = +60 cm
magnification m = -0.40
focal length being positive an magnification negative.
given lens is a convex lens.
for a lens
m = di/do and 1/f = (1/di) - (1/do)di
= -0.4do1/f = (1/-0.4do) - 1/do do
= -210 cmdi = -0.4 * -210
di = +84 cm
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Answer:
339.12 m/s, 343.31 m/s
Explanation:
For main rotor
diameter, d = 14.4 m
radius, r = 7.2 m
f = 450 rev/min = 450 / 60 = 7.5 rps
Angular speed, ω = 2 x π x f = 2 x 3.14 x 7.5 = 47.1 rad/s
linear speed, v = r x ω = 7.2 x 47.1 = 339.12 m/s
For tail rotor
diameter, d = 1.6 m
radius, r = 0.8 m
f = 4100 rev/min = 4100 / 60 = 68.33 rps
Angular speed, ω = 2 x π x f = 2 x 3.14 x 68.33 = 429.13 rad/s
linear speed, v = r x ω = 0.8 x 429.13 = 343.31 m/s
The pressure is 5000 Pa
Explanation:
The pressure exerted by a force on a surface is given by the equation:
where
p is the pressure (measured in Pascal, Pa)
F is the magnitude of the force
A is the area of the surface on which the force is exerted
In this problem, we have:
F = 2 N
Substituting into the equation, we find the pressure:
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