Answer:
14
Explanation:
45km =28 mph since its only half an hour divide rusty by 2 = 14
Answer: Wind follows a pattern because the Earth is spinning in one motion. If we were spinning in one way then another we would have one day go by then the spinning cycle would change and we would have to go through that day all over again, it would not be logical because then we would be in the same season as well, we would be in one season for the rest of our lives until we died.
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I) Tension in the spring = 2N
ii) Angular speed of the bung=5 rads-¹
iii) The time(T) it takes to make one complete revolution=1.256 seconds
<h3>Circular motion</h3>
Formula used to calculate the time(T) it takes to make one complete revolution = 2π √(l/g)
l = radius= 40cm = 0.4m
g = acceleration due to gravity = 10m/s-²
π =3.14( constant)
T = 2× 3.14 × √0.4/10
T = 6.28 ×√0.04
T = 6.28 × 0.2
T= 1.256 seconds
Formula to calculate angular speed(w)= 2π/T
where T= 1.256 secs
Therefore w = 2×3.14/1.256
w = 6.28/ 1.256
w = 5 rads-¹
Formula to calculate Tension in the spring(F)
= mrw²
where m= 200 g = 0.2kg
r = radius= 40cm = 0.4m
w = angular speed = 5 rads-¹
Therefore F = 0.2 × 0.4 × 5²
= 0.08 ×25
= 2N
Learn more about angular speed here:
brainly.com/question/6860269