hwk1 solutions - homework 01 – PHAM, QUOC – Due: Jan 22...

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: homework 01 – PHAM, QUOC – Due: Jan 22 2008, 1:00 am 1 Question 1, chap 1, sect 4. part 1 of 1 10 points A plastic tube allows a flow of 12 . 7 cm 3 / s of water through it. How long will it take to fill a 249 cm 3 bottle with water? Correct answer: 19 . 6063 s (tolerance ± 1 %). Explanation: Let : r = 12 . 7 cm 3 / s and V = 249 cm 3 . cm 3 ÷ cm 3 s = cm 3 · s cm 3 = s , so the time is defined by t = V r = 249 cm 3 12 . 7 cm 3 / s = 19 . 6063 s . Question 2, chap 1, sect 4. part 1 of 2 10 points The elevators in the John Hancock building in Chicago move 821 ft in 34 s. a) What is their speed in meters per sec- ond? Correct answer: 7 . 36002 m / s (tolerance ± 1 %). Explanation: 1 ft · 12 in . 1 ft · 2 . 54 cm 1 in . · 1 m 100 cm = 0 . 305 m , so v = parenleftbigg 821 ft 34 s parenrightbiggparenleftbigg . 305 m 1 ft parenrightbigg = 7 . 36002 m / s Question 3, chap 1, sect 4. part 2 of 2 10 points b) What is this speed in miles per hour? Correct answer: 16 . 4644 mi / h (tolerance ± 1 %). Explanation: Since 1 mi = 5280 ft and 1 h = 3600 s, v = parenleftbigg 821 ft 34 s parenrightbiggparenleftbigg 3600 s 1 h parenrightbiggparenleftbigg 1 mi 5280 ft parenrightbigg = 16 . 4644 mi / h . Question 4, chap 1, sect 4. part 1 of 3 10 points A hydrogen atom has a diameter of about 9 . 34 nm. a) Express this diameter in meters. Correct answer: 9 . 34 × 10 − 9 m (tolerance ± 1 %). Explanation: Basic Concept: 1 nm = 1 × 10 − 9 m 1 μ m = 1 × 10 − 6 m 1 mm = 1 × 10 − 3 m Given: diameter = 9 . 34 nm Solution: diameter = 9 . 34 nm = ( . 934 × 10 1 nm ) · 1 × 10 − 9 m 1 nm = 0 . 934 × 10 − 8 m Question 5, chap 1, sect 4. part 2 of 3 10 points b) Express this diameter in millimeters. Correct answer: 9 . 34 × 10 − 6 mm (tolerance ± 1 %). Explanation: Solution: diameter = ( . 934 × 10 − 8 m ) · 1 mm 1 × 10 − 3 m = 0 . 934 × 10 − 5 mm Question 6, chap 1, sect 4. part 3 of 3 10 points c) Express this diameter in micrometers. Correct answer: 0 . 00934 μ m (tolerance ± 1 %). Explanation: homework 01 – PHAM, QUOC – Due: Jan 22 2008, 1:00 am 2 Solution: diameter = ( . 934 × 10 − 8 m ) · 1 μ m 1 × 10 − 6 m = 0 . 934 × 10 − 2 μ m Question 7, chap 2, sect 7. part 1 of 1 10 points A sailboat is initially moving at a speed of 2 . 3 m / s. A strong wind blows up and accelerates the boat forward with a constant acceleration of . 3 m / s 2 for 8 s....
View Full Document

This note was uploaded on 04/23/2008 for the course PHY 317k taught by Professor Kopp during the Spring '07 term at University of Texas.

Page1 / 6

hwk1 solutions - homework 01 – PHAM, QUOC – Due: Jan 22...

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