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Naily [24]
3 years ago
7

Which one of the following indicates a drop in temperature? A. The alcohol in a thermometer expands. B. The brass on a bent bime

tallic strip is on the outside curve. C. The column of liquid in a thermometer moves up three degrees. D. A bimetallic strip bends so that the steel is on the outside curve.
Physics
2 answers:
solmaris [256]3 years ago
7 0

Answer:

A bimetallic strip bends so that the steel is on the outside curve.

Explanation:

A bimetallic strip is a combination of two different metals. The linear  coefficient of expansion of various metals are different, depending on their characteristics. For example, when a bimetallic strip of brass and steel are taken, thermal expansion coefficient of brass is more than that of steel.

That implies brass expands more than steel, for a given amount of heat supplied. So brass will curve outward since it becomes longer compared to steel. Steel will curve inwards.

Similarly, for cooling process where a drop in the temperature occurs, brass contracts more compared to steel and so Steel will be on outside curve.

Travka [436]3 years ago
3 0
D. A bimetallic strip bends so that the steel is on the outside curve.
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A pendulum consists of a large balanced mass hanging on the end of a long wire. At the point where a 28-kg pendulum has the grea
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The length of the wire is approximately 67.1 m

Explanation:

The parameters of the pendulum are;

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Torque, τ = F·L·sinθ = m·g·l·sinθ

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F = The applies force = The weight of the pendulum = m·g

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Plugging in the values of the variables gives;

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Therefore;

l = 1.84 × 10⁴ N·m/(28 kg × 9.8 m/s² ×  sin(89°)) = 67.0656080029 m ≈ 67.1 m

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3 years ago
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