a 25cm pendulum swings through an angle of 30degrees.find the lenght of the arc through which the tip of the pendulum swings.?
回答 (3)
2018-02-06 5:26 pm
Arc length
= Circumference × [(angle at center)/360°]
= 2 × π × r × (30/360)
= 2 × 3.14 × 25 × (30/360) cm
= 13.1 cm (to 3 sig. fig.)
= Circumference × [(angle at center)/360°]
= 2 × π × r × (30/360)
= 2 × 3.14 × 25 × (30/360) cm
= 13.1 cm (to 3 sig. fig.)
2018-02-06 3:41 pm
ℓ = 25*PI*/6 = 4.1(6)*PI cm ( ≈13.09 cm)
2018-02-06 6:11 pm
arc lenght = radius * angle in radians
angle = 30 degrees = π/6 radians
then
arc length = r * π/6 = 25 * 3.14 / 6 = 13.09 cm
angle = 30 degrees = π/6 radians
then
arc length = r * π/6 = 25 * 3.14 / 6 = 13.09 cm
收錄日期: 2021-04-24 00:56:14
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20180206062414AA05x2B