A constant force applied to object A causes it to

Chapter 5, Problem 6CQ

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QUESTION:

A constant force applied to \(\mathrm{A}\) causes \(\mathrm{A}\) to accelerate at \(5 \mathrm{~m} / \mathrm{s}^{2}\). The same force applied to \(\mathrm{B}\) causes an acceleration of \(3 \mathrm{~m} / \mathrm{s}^{2}\). Applied to \(\mathrm{C}\), it causes an acceleration of \(8 \mathrm{~m} / \mathrm{s}^{2}\).

a. Which object has the largest mass? Explain.

b. Which object has the smallest mass?

c. What is the ratio \(m_{\mathrm{A}} / m_{\mathrm{B}}\) of the mass of \(\mathrm{A}\) to the mass of \(\mathrm{B}\)?

Equation Transcription:

Text Transcription:

A

A

5 m/s^2

B

3 m/s^2

C

8 m/s^2

m_A/m_B

A

B


Questions & Answers

QUESTION:

A constant force applied to \(\mathrm{A}\) causes \(\mathrm{A}\) to accelerate at \(5 \mathrm{~m} / \mathrm{s}^{2}\). The same force applied to \(\mathrm{B}\) causes an acceleration of \(3 \mathrm{~m} / \mathrm{s}^{2}\). Applied to \(\mathrm{C}\), it causes an acceleration of \(8 \mathrm{~m} / \mathrm{s}^{2}\).

a. Which object has the largest mass? Explain.

b. Which object has the smallest mass?

c. What is the ratio \(m_{\mathrm{A}} / m_{\mathrm{B}}\) of the mass of \(\mathrm{A}\) to the mass of \(\mathrm{B}\)?

Equation Transcription:

Text Transcription:

A

A

5 m/s^2

B

3 m/s^2

C

8 m/s^2

m_A/m_B

A

B


ANSWER:

Step 1 of 3

(a)

Our aim is to find the object that has the largest mass for the given acceleration and the constant force.

The acceleration on object \(\mathrm{A} \mathrm{a}_{\mathrm{A}}=5 \mathrm{~m} / \mathrm{s}^{2}\)

The acceleration on object \(\mathrm{B} \mathrm{a}_{\mathrm{B}}=3 \mathrm{~m} / \mathrm{s}^{2}\)

The acceleration on object \(\mathrm{C} \mathrm{a}_{\mathrm{A}}=8 \mathrm{~m} / \mathrm{s}^{2}\)

The force applied is assumed to be \(F\)

In the case of constant force, the acceleration (a) is given by

                                                \(a \propto \frac{1}{m}\)

Since the acceleration is inversely proportional to the mass, the object that accelerated minimum acceleration will have the largest mass.

The answer is the object \(\mathrm{B}\).

 

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