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viktelen [127]
2 years ago
13

Donna has observed that her father can control the speed of their grandfather clock by adjusting the height of the weight on the

end of the pendulum. Donna thinks that the pendulum will move faster when the weight is lowered, and wants to test her idea. Donna gets a stopwatch and measures the time it takes for the pendulum to swing twenty times when the weight is moved to its lowest position. Donna begins to move the pendulum up by 1 cm and continues to measure the time for twenty swings of the pendulum. 1. What is the independent variable? 2. What is the dependent variable?
Chemistry
1 answer:
adelina 88 [10]2 years ago
4 0

Answer:

1. Independent variable : pendulum's height

2. Dependent variable : Pendulum speed

Explanation:

In an experiment scientist uses such things to search for any cause and its effect. experimenters design the model in such a way that change in one of the item causes a change in another.

These are called variables which are independent variable and dependent variable. Independent variables can be changed by the experimenter while dependent variables are not controllable by the experimenter.

In the context, the hypothesis is when the pendulum's height is reduced, the clock will speed up.

1. Independent variable : height of the pendulum

2. Dependent variable : Pendulum speed

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Answer:

In order to prepare 10 mL, 5 μM; <em> 2 mL of the 25 μM stock solution will be taken and diluted with water up to 10 mL mark.</em>

In order to prepare 10 mL, 10 μM; <em>4 mL of the 25 μM stock solution will be taken and diluted up to 10 mL mark.</em>

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Using the dilution equation:

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<em />

In order to prepare 10 mL, 10 μM from 25 μM stock,

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Initial volume = 100/25 = 4 mL

<em>4 mL of the 25 μM stock solution will be taken and diluted up to 10 mL mark.</em>

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In order to prepare 10 mL, 20 μM from 25 μM stock,

25 x initial volume = 20 x 10

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<em>8 mL of the 25 μM stock solution will be taken and diluted up to 10 mL mark.</em>

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