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bixtya [17]
4 years ago
15

Jack is planning an experiment to see how temperature can affect the reproduction rate of a certain species of bacteria. Jack is

listing some of the variables that could affect the outcome of the experiment. Which of the following variables should be included on his list?
A.time of year, clothes Jack wears, Petri dish mass
B. food Jack eats, day of week, number of pages in log book
C. temperature, light level, species of bacteria
D. time of day, color of walls in lab, Jack's height
Physics
2 answers:
77julia77 [94]4 years ago
8 0

Answer:

temperature, light level, species of bacteria

Explanation:

stealth61 [152]4 years ago
6 0
<span>The answer is C. temperature, light level, species of bacteria. All three variables are considerations regarding the reproduction rate of the bacteria. The other three answer choices can be eliminated easily because they each contain at least one irrelevant variable. In particular, all three contain a variable that makes reference to Jack's personal characteristics. These do not have any impact on the experiment and readily stand out to disqualify the entire answer choice.</span>
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The uranium nucleus consists of ? protons and ? neutrons.
vladimir1956 [14]

Answer:

An atomic nucleus consists of protons and neutrons, collectively called nucleons. Although protons repel each other, the nucleus is held tightly together by a short-range, but very strong, force called the strong nuclear force. A nucleus has less mass than the total mass of its constituent nucleons.

Explanation:

5 0
4 years ago
The three cables are used to support the 40-kg flowerpot. Determine the force developed in each cable for equilibrium.
BabaBlast [244]

The image of the 3 cables used to support the flower pot is not given so i have attached it.

Answer:

F_ab = 523.2 N

F_ac = 392.4 N

F_ad ≈ 762.7 N

Explanation:

First of all, let's Calculate the sum of forces around the z-axis.

But before then, we need to resolve the distances along the 3 axis to get;

1.5/√(1.5² + 2² + 1.5²) = 0.5145

Thus;

ΣF_z = 0;

(F_ad × 0.5145) - (40 × 9.81) = 0

Where;

(40 × 9.81) is the weight of the flower pot.

F_ad is the force in cable AD

Thus;

0.5145F_ad - 392.4 = 0

F_ad = 392.4/0.5145

F_ad ≈ 762.7 N

Now, let's do the same for the x-axis;

ΣF_z = 0;

Since x = 1.5, just like z was the same 1.5, we will adopt same resolved distance.

F_ac - F_ad(0.5145) = 0

Where F_ac is force in cable AC

F_ac = 762.7 × 0.5145

F_ac = 392.4 N

Lastly, for the y-axis;

ΣF_y = 0;

y is 2 and so, we need to recalculate the resolved distance.

F_ab - F_ad(2/√(1.5² + 2² + 1.5²)) = 0

Where F_ab is the force in cable AB

F_ab = 762.7 × 0.686

F_ab = 523.2 N

4 0
3 years ago
A 600 kg elevator starts from rest. It moves upward for 4.50 s with constant acceleration until it reaches its cruising speed, 1
viktelen [127]

Answer:

408.33watts

Explanation:

Power is expressed according to the formula

Power = work done/time

Power = force × distance/time

Power = Force× velocity

Find the force

F = mv/t

F = 600×1.75/4.5

F = 1050/4.5

F=233.33N

Get the power

Power = 233.33×1.75

Power = 408.33watts

Hence the average power of the elevator motor during this period is 408.33m/s

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Answer:

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What needs to be done to this circuit so that the light bulb lights up?
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The answer is the first one a
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