Answer:
v = 2.974
Explanation:
Perhaps the formula should be
v = √(2*g*d (sin(θ) - uk*cos(θ) ) This is a bit easier to read.
v = √(2* 9.80*0.725(0.707 - 0.12*0.707) ) Substitute values. Find 2*g*d
v = √14.21 * (0.707 - 0.0849) Figure out Sin(θ) - uk cos(θ)
v = √14.21 * (0.6222)
v = √8.8422 Take the square root of the value
v = 2.974
Answer:
No, the ride is not safe
Explanation:
From the diagram attached, it is seen that

................(1)

.......(2)

From the diagram, 


............(3)
Put (3) into (2)


w = weight of chair + weight of child = 50 + 10 = 60 lb
g = 32 ft/s²
m = w/g = 60/32 = 1.875
L = 30 ft
T = 3 secs


since 246.74 lbs > 200 lbs, it is not safe because the stationary chair will creak
Answer
correct answer is 3.10
Explanation:
in this question we have to multiply two numbers 1.003 and 3.09.
1.003 has 4 significant digits and 3.09 has 3 significant digits so answer must have 3 significant digits.

Hope it will help you