HW #1-2-solutions - pasha (sep635) HW #1-2 Antoniewicz...

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

View Full Document Right Arrow Icon
pasha (sep635) – HW #1-2 – Antoniewicz – (56445) 1 This print-out should have 30 questions. Multiple-choice questions may continue on the next column or page – fnd all choices beFore answering. 001 (part 1 of 7) 3.0 points A spacecraFt is observed to be at loca- tion h 200 m , 300 m , - 400 m i relative to an origin located on a nearby asteroid, and 5sl a t e ri ti so b s e r v e dt ob ea tl o c a t i o n h 425 m , 25 m , - 650 m i . ±ind the average ve- locity oF the spacecraFt, ¯ v = h v x ,v y ,v z i . What is v x in m/s? Correct answer: 45 m / s. Explanation: The average velocity oF the spacecraFt is calculated by fnding the change oF position over a change in time: ¯ v = ~ r f - ~ r i Δ t . Because ~ r is a vector, the average velocity will also be a vector and each component must be calculated separately. ±or ¯ v x the value becomes: ¯ v x = v 2 x - v 1 x Δ t = (425 m) - (200 m) (5 s) = 45 m / s 002 (part 2 of 7) 3.0 points What is v y in m/s? Correct answer: - 55 m / s. Explanation: The average velocity oF the spacecraFt is calculated by fnding the change oF position over a change in time: ¯ v = ~ r f - ~ r i Δ t . Because ~ r is a vector, the average velocity will also be a vector and each component must be calculated separately. ±or ¯ v y the value becomes: ¯ v y = v 2 y - v 1 y Δ t = (25 m) - (300 m) (5 s) = - 55 m / s 003 (part 3 of 7) 2.0 points What is v z in m/s? Correct answer: - 50 m / s. Explanation: The average velocity oF the spacecraFt is calculated by fnding the change oF position over a change in time: ¯ v = ~ r f - ~ r i Δ t . Because ~ r is a vector, the average velocity will also be a vector and each component must be calculated separately. ±or ¯ v z the value becomes: ¯ v z = v 2 z - v 1 z Δ t = ( - 650 m) - ( - 400 m) (5 s) = - 50 m / s 004 (part 4 of 7) 4.0 points What is | ~ v | in m/s? Correct answer: 86 . 8907 m / s. Explanation: The magnitude is calculated by: | ~ v | = q v 2 x + v 2 y + v 2 z = q
Background image of page 1

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

View Full DocumentRight Arrow Icon
pasha (sep635) – HW #1-2 – Antoniewicz – (56445) 2 Find the unit vector in the direction of the velocity of the spacecraft, ˆ v = h ˆ v x , ˆ v y , ˆ v z i . What is ˆ v x ? Correct answer: 0 . 517892. Explanation: The unit vector for a vector is given as : ˆ v = h ˆ v x , ˆ v y , ˆ v z i = h v x ,v y ,v z i | ~ v | For example: ˆ v x = v x | ~ v | = 45 m / s 86 . 8907 m / s = 0 . 517892 006 (part 6 of 7) 3.0 points What is ˆ v y ? Correct answer: - 0 . 632979. Explanation: The unit vector for a vector is given as : ˆ v = h ˆ v x , ˆ v y , ˆ v z i = h v x ,v y ,v z i | ~ v | For example: ˆ v y = v y | ~ v | = - 55 m / s 86 . 8907 m / s = - 0 . 632979 007 (part 7 of 7) 2.0 points What is ˆ v z ?
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 11/17/2011 for the course PHY 303K taught by Professor Turner during the Fall '08 term at University of Texas at Austin.

Page1 / 7

HW #1-2-solutions - pasha (sep635) HW #1-2 Antoniewicz...

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