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2 years ago

All of the following would be questions that could be scientifically investigated except:

Physics

2 answers:

Law Incorporation [45]2 years ago

8 0

Answer: option A: <u>What is the proper number of children to have in today's family?</u>

A scientific investigation includes a scientific method to approach a problem. There is a systematic approach is used to address a problem. It generally includes five steps: first a problem needs to be identified. Thereafter, a background research is important to form a hypothesis. Fourthly, an experiment, observation or measurements are done in order to draw conclusions at last.

From the given questions, option A is a question which cannot be scientifically investigated. This is because, it varies from individual to society to the economy of a state. The conclusion would not be generalized solution.

option B.Will equal sizes of Styrofoam and wood have the same mass? can be scientifically investigated. The given quantities can be measured and tested.

C. Does adding salt to water raise its boiling point? This can be scientifically tested

D. Does lack of sunlight affect plant growth? This can also be scientifically measured.

ra1l [238]2 years ago

6 0

All of the following would be questions that could be scientifically investigated except A.
That is an opinion and cannot become a fact.

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A record player turntable initially rotating at 3313 rev/min is braked to a stop at a constant rotational acceleration. The turn

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Answer:

(A) It will take 22 sec to come in rest

(b) Work done for coming in rest will be 0.2131 J

Explanation:

We have given the player turntable initially rotating at speed of $33\frac{1}{3}rpm=33.333rpm=\frac{2\times 3.14\times 33.333}{60}=3.49rad/sec$

Now speed is reduced by 75 %

So final speed $\frac{3.49\times 75}{100}=2.6175rad/sec$

Time t = 5.5 sec

From first equation of motion we know that '

$\alpha =\frac{\omega -\omega _0}{t}=\frac{2.6175-3.49}{4}=-0.158rad/sec^2$

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So time t to come in rest $t=\frac{0-3.49}{-0.158}=22sec$

(b) The work done in coming rest is given by

$\frac{1}{2}I\left ( \omega ^2-\omega _0^2 \right )=\frac{1}{2}\times 0.035\times (0^2-3.49^2)=0.2131J$

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