/*! This file is auto-generated */ .wp-block-button__link{color:#fff;background-color:#32373c;border-radius:9999px;box-shadow:none;text-decoration:none;padding:calc(.667em + 2px) calc(1.333em + 2px);font-size:1.125em}.wp-block-file__button{background:#32373c;color:#fff;text-decoration:none} 9DQ Three archers each fire four arr... [FREE SOLUTION] | 91影视

91影视

Log out

Learning Materials

Features

Discover

Chapter 1: 9DQ (page 27)

Three archers each fire four arrows at a target. Joe鈥檚 four arrows hit at points 10 cm above, 10 cm below, 10 cm to the left, and 10 cm to the right of the centre of the target. All four of Moe鈥檚 arrows hit within 1 cm of a point 20 cm from the centre, and Flo鈥檚 four arrows hit within 1 cm of the centre. The contest judge says that one of the archers is precise but not accurate, another archer is accurate but not precise, and the third archer is both accurate and precise. Which description applies to which archer? Explain.

Short Answer

Expert verified

Flo is accurate and precise.

Step by step solution

01

Introduction

The archer holds the feathered end of the arrow against the string and pulls it back.

Releasing the string throws the arrow forward with the elastic force of the bow.

02

Explanation  

Joe is accurate because all his arrows landed 10 cm from the center (which can be considered within tolerance), but they are not accurate because they did not land in the same place (they ended up in all directions).

Hence, Joe is accurate but not precise.

Moe is not accurate as his arrows landed far from the intended target (20 cm) but is precise because all the arrows ended up nearby (within 1 cm).

Hence, Moe is precise but not accurate.

Flo is both accurate (as his arrows landed near the centre) and precise (all arrows landed with in 1 cm of the centre).

Hence, Flo is accurate and precise.

Unlock Step-by-Step Solutions & Ace Your Exams!

  • Full Textbook Solutions

    Get detailed explanations and key concepts

  • Unlimited Al creation

    Al flashcards, explanations, exams and more...

  • Ads-free access

    To over 500 millions flashcards

  • Money-back guarantee

    We refund you if you fail your exam.

Over 30 million students worldwide already upgrade their learning with 91影视!

One App. One Place for Learning.

All the tools & learning materials you need for study success - in one app.

Get started for free

Most popular questions from this chapter

Hot Jupiters. In 2004 astronomers reported the discovery of a large Jupiter-sized planet orbiting very close to the star HD鈥�179949 (hence the term 鈥渉ot Jupiter鈥�). The orbit was just19 the distance of Mercury from our sun, and it takes the planet only3.09days to make one orbit (assumed to be circular). (a) What is the mass of the star? Express your answer in kilograms and as a multiple of our sun鈥檚 mass. (b) How fast (in km>s) is this planet moving?

A certain fuel-efficient hybrid car gets gasoline mileage of 55.0 mpg (miles per gallon). (a) If you are driving this car in Europe and want to compare its mileage with that of other European cars, express this mileage in km/L (1L = liter). Use the conversion factors in Appendix E. (b) If this car鈥檚 gas tank holds 45 L, how many tanks of gas will you use to drive 1500 km?

(a) The recommended daily allowance (RDA) of the trace metal magnesium is 410 mg/day for males. Express this quantity in 碌g/day. (b) For adults, the RDA of the amino acid lysine is 12 mg per kg of body weight. How many grams per day should a 75-kg adult receive? (c) A typical multivitamin tablet can contain 2.0 mg of vitamin B2 (riboflavin), and the RDA is 0.0030 g/day. How many such tablets should a person take each day to get the proper amount of this vitamin, if he gets none from other sources? (d) The RDA for the trace element selenium is 0.000070 g/day. Express this dose in mg/day.

Calculate the earth鈥檚 gravity force on a 75-kg astronaut who is repairing the Hubble Space Telescope 600 km above the earth鈥檚 surface, and then compare this value with his weight at the earth鈥檚 surface. In view of your result, explain why it is said that astronauts are weightless when they orbit the earth in a satellite such as a space shuttle. Is it because the gravitational pull of the earth is negligibly small?

Question-. (a) Does it make sense to say that a vector is negative? Why? (b) Does it make sense to say that one vector is the negative of another? Why? Does your answer here contradict what you said in part (a)?
See all solutions

Recommended explanations on Physics Textbooks

Energy Physics

Read Explanation

Geometrical and Physical Optics

Read Explanation

Conservation of Energy and Momentum

Read Explanation

Fundamentals of Physics

Read Explanation

Dynamics

Read Explanation

Turning Points in Physics

Read Explanation
View all explanations

What do you think about this solution?

We value your feedback to improve our textbook solutions.

Study anywhere. Anytime. Across all devices.