Ask Singapore Homework?
Upload a photo of a Singapore homework and someone will email you the solution for free.
Question
junior college 1 | H2 Maths
2 Answers Below
Anyone can contribute an answer, even non-tutors.
pls help asap
Date Posted: 1 year ago
Views: 248
50 = rθ + 2r
θ = 50/r - 2
dθ/dt = -50/r² × dr/dt = -50/10² × -5 = 5/2 radians per second.
A = 1/2r²θ = 1/2 r²(50/r - 2) = 25r - r²
dA/dt = (25 - 2r) × dr/dt = 5 × -5 = -25 cm² per second.
θ = 50/r - 2
dθ/dt = -50/r² × dr/dt = -50/10² × -5 = 5/2 radians per second.
A = 1/2r²θ = 1/2 r²(50/r - 2) = 25r - r²
dA/dt = (25 - 2r) × dr/dt = 5 × -5 = -25 cm² per second.
See 2 Answers
Implicit differentiation approach :)
done
0 Upvotes
clear 0 Downvotes
Hi, every time I see a differentiation question with respect to time, I immediately try to express the required thing (d0/dt) as a product or division of two other things (d0/dr * dr/dt).
Although treating the two things like fractions isn't right, it helps in solving these type of questions.
Although treating the two things like fractions isn't right, it helps in solving these type of questions.
Date Posted:
1 year ago
360 Tutoring Program