The figure shows two 1.0 k g blocks connected by a rope. A second rope hangs ben

Question

The figure shows two 1.0kg blocks connected by a rope. A second rope hangs beneath the lower block. Both ropes have a mass of 250g . The entire assembly is accelerated upward at 3.0m/s2 by force F.

What is F?

What is the tension at the top end of rope 1?

http://session.masteringphysics.com/problemAsset/1384152/5/knight_Figure_08_26.jpg

The figure shows two 1.0kg blocks connected by a rope. A second rope hangs beneath the lower block. Both ropes have a mass of 250g . The entire assembly is accelerated upward at 3.0m/s2 by force F. What is F? What is the tension at the top end of rope 1?

Explanation / Answer

Total mass = Mass of 2 blocks + mass of ropes = 2.5 kg

Acceleration = 3 m/s^2

So F = ma = 7.5 N

Tension at a point = Mass below the point x Acceleration

Mass below the top end of rope 1 = 1.5kg
So Tension = 1.5*3 = 4.5 kg

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