Mastering Physics Solutions: Pushing a Lawnmower

Mastering Physics Solutions: Pushing a Lawnmower

On February 15, 2014, in Chapter 04: Force and Motion, by Mastering Physics Solutions

Part A = F = -(μ * w) / ((μ * sin(θ)) – cos(θ))
Part B = 1/μ

Find the magnitude, Fh, of the force required to slide the lawnmower over the ground at constant speed by pushing the handle.
Find an expression for tan(θcritical)

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Mastering Physics Solutions: Pushing Too Hard

Mastering Physics Solutions: Pushing Too Hard

On October 11, 2013, in Chapter 04: Force and Motion, by Mastering Physics Solutions

Part A = F1 < F2 <= 2F1
Part B = 1/2F1 <= F3 < F1

The baggage handler now pushes a second box, identical to the first, so that it accelerates at a rate of 2a. How does the magnitude of the force F2 that the handler applies to this box compare to the magnitude of the force F1 applied to the first box?
Now assume that the baggage handler pushes a third box of mass m/2 so that it accelerates at a rate of 2a. How does the magnitude of the force F3 that the handler applies to this box compare to the magnitude of the force F1 applied to the first box?

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Mastering Physics Solutions: Two Masses, a Pulley, and an Inclined Plane

Mastering Physics Solutions: Two Masses, a Pulley, and an Inclined Plane

On October 6, 2013, in Chapter 04: Force and Motion, by Mastering Physics Solutions

Part A = (a + gsin(θ) + μgcos(θ)) / (g – a)

Find the ratio of the masses m1 / m2.

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Mastering Physics Solutions: Blocks in an Elevator Ranking Task

Mastering Physics Solutions: Blocks in an Elevator Ranking Task

On October 6, 2013, in Chapter 04: Force and Motion, by Mastering Physics Solutions

Part A = (C = D) < (A = B) < (E = F) < (G = H) Note: see explanation for key of A-H
Part B = (C = D) < (A = B) < (E = F) < (G = H) Note: see explanation for key of A-H

Assume the elevator is at rest. Rank the magnitude of the forces.
Now, assume the elevator is moving upward at increasing speed. Rank the magnitude of the forces.

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Mastering Physics Solutions: Mechanical Advantage

Mastering Physics Solutions: Mechanical Advantage

On September 28, 2013, in Chapter 04: Force and Motion, by Mastering Physics Solutions

Part A = 254.8 N
Part B = 509.6 N
Part C = 509.6 N

Determine the force F required to lift the crate with constant speed.
Determine the tension in the upper chain.
Determine the tension in the lower chain.

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