PH101 HW 2D Motion

PH101 HW 2D Motion - This print-out should have 15...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: This print-out should have 15 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 (part 1 of 2) 10.0 points A cat climbs 20 m directly up a tree. What is the horizontal component of the cats displacement? Correct answer: 0 m. Explanation: Let : d = 20 m and = 90 . 20m x = (20 m)(cos 90 ) = 0 m . 002 (part 2 of 2) 10.0 points What is the vertical component of the cats displacement? Correct answer: 20 m. Explanation: y = d sin = (20 m) sin 90 = 20 m . 003 (part 1 of 2) 10.0 points A descent vehicle landing on the moon has a vertical velocity toward the surface of the moon of 23 . 7 m / s. At the same time, it has a horizontal velocity of 55 m / s. At what speed does the vehicle move along its descent path? Correct answer: 59 . 889 m / s. Explanation: Let : v v = 23 . 7 m / s , and v h = 55 m / s . v h v v v The speeds act at right angles to each other, so v = v 2 h + v 2 v = (55 m / s) 2 + (23 . 7 m / s) 2 = 59 . 889 m / s . 004 (part 2 of 2) 10.0 points At what angle with the vertical is its path? Correct answer: 66 . 6883 . Explanation: v h is the side opposite and v v is the side adjacent to the angle, so tan = v h v v = arctan v h v v = arctan 55 m / s 23 . 7 m / s = 66 . 6883 . 005 10.0 points Three vectors A , B , and C have the following x and y components: A x = 2 . 3, A y =- 1 . 8; B x =- 3 . 5, B y = 4 . 3; C x = 2 . 3, C y = 3 . 6. What is the magnitude of A + B + C ? Correct answer: 6 . 19839. Explanation: Given : A = (2 . 3 ,- 1 . 8) , B = (- 3 . 5 , 4 . 3) , and C = (2 . 3 , 3 . 6) . Let D = A + B + C . The x component o f D is D x = A x + B x + C x = 2 . 3+(- 3 . 5)+2 . 3 = 1 . 1 and the y component of D is D y = A...
View Full Document

Page1 / 6

PH101 HW 2D Motion - This print-out should have 15...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online