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Mariana [72]
3 years ago
7

A student states that exercise will affect the number of times a person can squeeze a clothespin in a certain amount of time. An

experiment is carried out to test this hypothesis. A group of 10 students sits quietly before squeezing a clothespin as many times as possible during a time period of 1 minute. A second group of 10 students does 25 jumping jacks before squeezing a clothespin as many times as possible during a time period of 1 minute.
What is the dependent variable in the experiment described above?


Question 1 options:


A.Type of exercise



B.Number of times a person can squeeze a clothespin



C.Number of students in each group



D.Amount of time spent exercising
Chemistry
1 answer:
Stella [2.4K]3 years ago
6 0

Answer:

B.Number of times a person can squeeze a clothespin

Explanation:

Hello,

Since the idea is to detect the effect of the previous exercise on the number of times a person can squeeze a clothespin and this is done by setting a specific time of 1 minute (a controlled variable) and subsequently record the times, one can state that the times the clothespin is squeezed depend both on the type of exercise and the time, thus those times turn out into the dependent variable.

Best regards.

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What is water's density at 93 ∘C? Assume a constant coefficient of volume expansion. Express your answer with the appropriate un
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Answer:

982.5 kg/m³

Explanation:

When the temperature of a fluid increases, it dilates, and because of the variation of the volume, it's density will vary too. The density can be calculated by the expression:

ρ₁ = ρ₀/(1 + β*(t₁ - t₀))

Where ρ₁ is the final density, ρ₀ the initial density, β is the constant coefficient of volume expansion, t₁ the final temperature, and t₀ the initial temperature.

At t₀ = 4°C, the water desity is ρ₀ = 1,000 kg/m³. The value of the constant for water is β = 0.0002 m³/m³ °C, so, for t₁ = 93°C

ρ₁ = 1,000/(1 + 0.0002*(93 - 4))

ρ₁ = 1,000/(1+ 0.0178)

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3 years ago
MAGNESIUM (Mg)<br> +FLUORINE (F) =
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Answer:

MgF2 magnesium fluoride

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a doctor's order is 0.125 g of ampicillin. the liquid suspension on hand contains 250 mg/5.0 ml. how many milliliters of the sus
disa [49]
0.125 g=(0.125 g)(1000 mg/1g)=125 mg.

Then, we need 125 mg of ampicillin.
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x--------------------125 mg of ampicilling

x=(5 ml * 125 mg of ampicilling) / 250 mg of ampicilling=2.5 ml

Answer: we require 2.5 ml
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Answer:

m_{O_2}=61.87gO_2

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Explanation:

Hello,

Considering the given reaction's stoichiometry, grams of oxygen result:

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Moreover, the mass of produced carbon dioxide turns out:

m_{CO_2}=58.0gC_6H_{12}O_6*\frac{1molC_6H_{12}O_6}{180gC_6H_{12}O_6}*\frac{6molCO_2}{1molC_6H_{12}O_6}*\frac{44gCO_2}{1molCO_2}\\m_{O_2}=85.07gCO_2

Best regards.

6 0
3 years ago
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