Hewitt et al. - Conceptual Physical Science 3/e (Homework)

Chris Read

Addison Wesley, section 1, Fall 2010

Instructor: Dr. Friendly

Current Score : 0 / 21

Due : Sunday, September 12, 2010 10:00 PM EDT

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Here are some textbook questions from Conceptual Physical Science 3/e by Paul G. Hewitt, John Suchocki, and Leslie A. Hewitt published by Addison-Wesley. 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. –/1 points Notes Question: HewCPS3 1.E.031.

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Someone standing at the edge of a cliff (as in Figure 1.24) throws a ball straight up at a certain speed and another ball nearly straight down with the same initial speed.

Figure 1.24.

If air resistance is negligible, which ball has the greater speed when it strikes the ground below?

Both will strike the ground below at the same speed. The ball thrown downward will strike at a greater speed. The ball thrown upward will strike at a greater speed.

2. –/3 points Notes Question: HewCPS3 2.E.027.

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If a Mack truck and Honda Civic have a head-on collision, upon which vehicle is the impact force greater?

the Mack truck the Honda Civic the same for each vehicle

Which vehicle undergoes the greater change in its motion?

the Mack truck the Honda Civic the same for each vehicle

Explain.

3. –/2 points Notes Question: HewCPS3 3.P.003.

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A 5 kg fish swimming at 4 m/s swallows an absent-minded 1 kg fish at rest.

(a) What is the speed of the larger fish after lunch?
m/s
(b) What would be its speed if the smaller fish were swimming toward it at 4 m/s?
m/s

4. –/1 points Notes Question: HewCPS3 3.TB.1.17.

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Padded dashboards in cars are safer in an accident than nonpadded ones because an occupant hitting the dash has (select all that apply)

decreased impulse. increased time of impact. decreased impact force.

5. –/14 points Notes Question: HewCPS3 17.E.034.

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Balance these equations. (Use the lowest possible coefficients.)

(a) H₂(g) + N₂(g) → NH₃(g)

(b) Fe(s) + S(s) → Fe₂S₃(s)

(c) CH₄(g) + O₂(g) → CO₂(g) + H₂O(l)

(d) CO₂(g) + H₂O(l) → C₆H₁₂O₆(s) + O₂(g)

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Hewitt et al. - Conceptual Physical Science 3/e (Homework)

Current Score : 0 / 21