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Hewitt et al. - Conceptual Physical Science 2/e (Homework)

James Finch

Physical Science, section 1, Fall 2010

Instructor: Dr. Friendly

Current Score: 0/8

Due: Wednesday, October 13, 2010 18:00 EDT

About this Assignment

Question
Points
1 2 3 4 5
0/1 0/1 0/2 0/1 0/3
Total
0/8

Description

Here are some textbook questions from Conceptual Physical Science 2/e by Hewitt, Suchocki, and Hewitt published by Benjamin/Cummings (Addison Wesley Longman). Click here for a list of all of the questions coded in WebAssign.


Instructions

This demo assignment allows many submissions and allows you to try another version of the same question for practice.



1. 0/1 points All Submissions Notes Question: HewCPS2 14.P.02.
Question part
Points
Submissions
1
0/1
1/50
Total
0/1
 
Suppose that you measure the intensity of radiation from carbon-14 in an ancient piece of wood to be 9% of what it would be in a freshly cut piece of wood. How old is this artifact?
Enter a number.
Your answer is incorrect. yr

2. –/1 points Notes Question: HewCPS2 18.P.01.
Question part
Points
Submissions
1
0/1
0/50
Total
0/1
 
How many grams of sodium chloride is needed to make 12 L of a solution that has a concentration of 4.0 g per liter of solution?
Enter a number.
 g

3. –/2 points Notes Question: HewCPS2 4.P.02.
Question part
Points
Submissions
1 2
0/1 0/1
0/50 0/50
Total
0/2
 
Many people mistakenly believe that the astronauts who orbit the earth are "above gravity." Calculate g for space shuttle territory, 270 kilometers above the earth's surface (dashed line in sketch). Earth's mass is 6 x 1024 kg, and its radius is 6.38 x 106 m (6380 km).
Enter a number.
 m/s2
Your answer is what percentage of 9.8 m/s2?
Enter a number.
%



4. –/1 points Notes Question: HewCPS2 5.P.03.
Question part
Points
Submissions
1
0/1
0/50
Total
0/1
 
When a 2.2 kg object is suspended by a scale in water, the scale reads 1.5 kg. What is the density of the object?
Enter a number.
 kg/m3

5. –/3 points Notes Question: HewCPS2 9.P.02.
Question part
Points
Submissions
1 2 3
0/1 0/1 0/1
0/50 0/50 0/50
Total
0/3
 
An ideal transformer has 40 turns in its primary and 250 turns in its secondary. 12 V ac is connected to the primary.
(a) Find the volts ac available at the secondary.
Enter a number.
 V
(b) Find the current in a 20 ohm device connected to the secondary.
Enter a number.
 A
(c) Find the power supplied to the primary.
Enter a number.
 W

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