
Concept explainers
Consider the three connected objects shown in Figure P5.43. Assume first that the inclined plane is frictionless and that the system is in equilibrium. In terms of m, g, and θ, find (a) the mass M and (b) the tensions T1 and T2. Now assume that the value of M is double the value found in part (a). Find (c) the acceleration of each object and (d) the tensions T1 and T2. Next, assume that the coefficient of static friction between m and 2m and the inclined plane is μs and that the system is in equilibrium. Find (e) the maximum value of M and (f) the minimum value of M. (g) Compare the values of T2 when M has its minimum and maximum values.
Figure P5.43
(a)

The mass
Answer to Problem 43P
The mass
Explanation of Solution
The free body diagram of the mass
The free body diagram of the mass
The free body diagram of the mass
Apply Newton’s second law in the Figure1.
Here,
Apply Newton’s second law in the Figure 2.
Here,
Apply Newton’s second law in the Figure 3.
Assume that, the system is in equilibrium,
Use equation (I) and (III), in (II).
Conclusion:
Therefore, the mass
(b)

The tensions
Answer to Problem 43P
The tension
Explanation of Solution
From the part (a),
Use equation (IV) in (III), and substitute
Conclusion:
Therefore, the tensions
(c)

The acceleration of each object when the value of
Answer to Problem 43P
The acceleration of each object when the value of
Explanation of Solution
Assume that,
Substitute,
Use equation (I) and (V) in (VII), substitute,
Conclusion:
Therefore, the acceleration of each object when the value of
(d)

The tensions
Answer to Problem 43P
The tensions
Explanation of Solution
Use equation (VI) in (I), substitute,
Use equation (VI) in (III), and use
Conclusion:
Therefore, the tensions
(e)

The maximum value of
Answer to Problem 43P
The maximum value of
Explanation of Solution
At the equilibrium the acceleration is zero, and the frictional forces acting down the incline.
Use
Use
Rewrite the equation (III) for
Use equation (IX) and (X) in (XI).
Conclusion:
Therefore, the maximum value of
(f)

The minimum value of
Answer to Problem 43P
The minimum value of
Explanation of Solution
Rewrite the equation (III) for
At the equilibrium the acceleration is zero, and impending motion up the incline, so the frictional forces acting up the incline.
Use
Since the frictional forces acting up the incline.
Use
Since the frictional forces acting up the incline.
Use equation (XII) and (XIII) in (XIV).
Conclusion:
Therefore, the minimum value of
(g)

The value of
Answer to Problem 43P
The value of
Explanation of Solution
Subtract equation (XII) from (XI).
Use
Conclusion:
Therefore, the value of
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Chapter 5 Solutions
Principles of Physics: A Calculus-Based Text, Hybrid (with Enhanced WebAssign Printed Access Card)
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