Explanation:
If the distance between the bottom of the ladder and the wall is x, then:
cos θ = x / 10
Taking derivative with respect to time:
-sin θ dθ/dt = 1/10 dx/dt
Substituting for θ:
-sin (acos(x / 10)) dθ/dt = 1/10 dx/dt
Given that x = 6 and dx/dt = 1.1:
-sin (acos(6/10)) dθ/dt = 1/10 (1.1)
-0.8 dθ/dt = 0.11
dθ/dt = -0.1375
The angle is decreasing at 0.1375 rad/s.
Refract mean to break. the quarter would look broken. hope this helps
A
Explanation:
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We find the work using the formula as written below:
W = mgh/t
where
m is mass
g is gravity equal to 9.81 m/s²
h is the height
t is time
W = (81 kg)(9.81 m/s²)(3 m)/10 s = 238.38 W
To convert:
238.38 W( 1 hp/746 W) =<em> 0.32 hp</em>