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Eduardwww [97]
3 years ago
5

A 100g block lies on an inclined plane that makes an angle of 15 degrees with the horizontal. The coefficient of kinetic frictio

n between the block and the plane is 0.6. Attached to this block is a massless, frictionless rope connected to a block-and-tackle type device (again, frictionless and massless). Hanging on the pulley is a container of mass 30g. How much mass should you put in the container so that the 100g block slides down the inclined plane at constant speed

Physics
1 answer:
Fed [463]3 years ago
8 0

Answer:

Mass that one should put in the container so that the 100 g block slides down the inclined plane at constant speed = 34.16 g

Explanation:

The vertical forces (with respect to the inclined plane) acting on the 100 g block include the component of the weight of the block in the direction vertical to the inclined plane and the normal reaction of the plane on the block.

And sum of upward forces = sum of downward forces.

N = mg cos θ

m = 100 g = 0.10 kg

g = acceleration due to gravity = 9.8 m/s²

θ = 15°

N = (0.1×9.8×cos 15°) = 0.946582 N

The horizontal forces (With respect to the inclined plane) include the frictional force (acting upwards for the inclined plane, opposite to the intended direction of motion), the Tension in the rope (acting downwards, away from the 100 g block) and the horizontal component (with respect to the inclined plane) of the weight of the block, F, (also acting downards).

For the body to slide down the inclined plane at constant speed, the downward sloping forces must balance the frictional force, that is, there will be no acceleration.

Frictional force = Tension + F

Frictional force = μN

where μ = coefficient of kinetic friction = 0.60

N = normal reaction = 0.9466 N

Frictional force = Fr = (0.60 × 0.9466) = 0.56796 N = 0.568 N

The horizontal component (with respect to the inclined plane) of the weight of the block (also acting downards) = mg sin θ

F = (0.10 × 9.8 × sin 15°) = 0.253624 N

Tension in the rope = T = ?

Fr = F + T

T = Fr - F = 0.568 - 0.253624 = 0.314376 N = 0.3144 N

But the balance on the rope now has the total weight on the container (weight of container + weight on the container) to be equal to 2T.

2T = mg

2 × 0.3144 = 9.8m

m = 0.06416 kg = 64.16 g.

Mass of the container = 30 g

So, mass that one should put in the container so that the 100 g block slides down the inclined plane at constant speed = 64.16 - 30 = 34.16 g

Hope this Helps!!!

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Consider two aluminum rods of length 1 m, one twice as thick as the other. If a compressive force F is applied to both rods, their lengths are reduced by  \Delta L_{thick}and \Delta L_{thin}, respectively.The ratio ΔLthick rod/ΔLthin rod is:

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  Making Strain the subject

              \epsilon = \frac{\sigma}{E}

now in this question we are that the same tension was applied to both wires so

      \frac{\sigma}{E} would be constant

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for the two wire we have that

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                E = \frac{\frac{F}{A} }{\frac{\Delta L}{L} }

                    E * \frac{\Delta L }{L}  = \frac{F}{A}

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Now we are told that a comprehensive force is applied to the wire so for this question

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