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4 years ago

15

Two groups of students were tested to compare their speed working math problems. Each group was given the same problems. One gro

up used calculators and the other group computed without calculators. What’s the hypothesis?

1 answer:

oee [108]4 years ago

3 0

Answer:

The people with caculators will probably answer faster due to thier ablitiy to use a device of technology

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If your car runs out of gas and you must push it 250 m to the nearest gas station. How much work is done on the car if it is pus

tankabanditka [31]

Answer:

1750 Joules.

Explanation:

Work done = force * distance

= 7 * 250

= 1750 Joules.

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3 years ago

A single loop of nickel wire, lying flat in a plane, has an area of 7.40 cm^2 and a resistance of 2.40 Ω. A uniform magnetic fie

ale4655 [162]

Explanation:

It is given that,

Area of nickel wire, $A=7.4\ cm^2=7.4\times 10^{-4}\ m^2$

Resistance of the wire, R = 2.4 ohms

Initial value of magnetic field, $B_1=0.5\ T$

Final magnetic field, $B_2=3\ T$

Time, t = 1.12 s

Let I is the induced current in the loop of wire over this time. Te emf induced in the wire is given by Faraday's law as :

$\epsilon=-\dfrac{d\phi}{dt}$

$\epsilon=-\dfrac{d(BA)}{dt}$

$\epsilon=-A\dfrac{d(B)}{dt}$

$\epsilon=-A\dfrac{B_2-B_1}{t}$

$\epsilon=-7.4\times 10^{-4}\times \dfrac{3-0.5}{1.12}$

$\epsilon=1.65\times 10^{-3}\ V$

Induced current in the loop of wire is given by :

$I=\dfrac{\epsilon}{R}$

$I=\dfrac{1.65\times 10^{-3}}{2.4}$

$I=6.87\times 10^{-4}\ A$

So, the induced current in the loop of wire over this time is $6.87\times 10^{-4}\ A$ . Hence, this is the required solution.

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3 years ago

When an object experiences centripetal acceleration, in which direction does it accelerate?

tatuchka [14]

Centripetal acceleration points from the object toward the center of the circular path it's traveling.

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3 years ago

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If length of wire is doubled keeping the diameter constant ,its Youngs modulus will be

Luda [366]

Answer:

Y = Stress / Strain = (F / A) / (l / L) where l is the change in length

Since L is doubled and A remains the same one would expect l, the change in length to also double so Y remains the same.

As an example think of hanging a weight from a spring and the same weight from a similar spring of twice the length - one would expect the longer spring to show twice the extension of the shorter spring.

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3 years ago

Fernando vai à pé pra escola. Todos os dias ele sai as 6:30 e chega na escola as 6:55. Nisso ele percorre 2km. Na volta pra casa

alexgriva [62]

<span>Como sabemos a quantidade de tempo que leva a Fernando para chegar à escola, quando sua classe começa e termina, e quanto tempo leva para chegar em casa, podemos resolver quanto tempo Fernando estava longe de casa. O que fiz primeiro foi adicionar os 40 minutos que levou Fernando para chegar em casa às 11:30 e chegou às 12:10. Foi quando Fernando chegou em casa, então tudo o que precisamos fazer agora é fator em 6:30 e descubra quanto tempo ele estava fora da casa. Eu fiz isso contando as horas e subtraindo os minutos extras. O tempo que Fernando acabou é de 5 horas e 40 minutos.</span>

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4 years ago