I need help with the following three physics problems please!

Answers

Answer 1

Answer: None of these is a Physics problem. The numbers, and the fractions that
they appear in, might have come from Physics problems, but these are
nothing more than arithmetic exercises, and they can be whipped out
in a hurry with a little bit of fancy calculator work. You don't have to
know any Physics in order to answer any of these.

The first one is 2.7 x 10⁻²⁴ Newton.

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In the mobile m1=0.42 kg and m2=0.47 kg. What must the unknown distance to the nearest tenth of a cm be if the masses are to be balanced? The answer is 13.4 In the mobile what is the value for m3 to the nearest hundredth of a kilogram?

Answers

Complete Question

The complete question is shown on the first uploaded image

Answer:

Explanation:

From he question we are told that

The first mass is $m_1 = 0.42kg$

The second mass is $m_2 = 0.47kg$

From the question we can see that at equilibrium the moment about the point where the string holding the bar (where $m_1 \ and \ m_2$ are hanged ) is attached is zero

Therefore we can say that

$m_1 * 15cm = m_2 * xcm$

Making x the subject of the formula

$x = (m_1 * 15)/(m_2)$

$= (0.42 * 15)/(0.47)$

$x = 13.4 cm$

Looking at the diagram we can see that the tension T on the string holding the bar where $m_1 \ and \ m_2$ are hanged is as a result of the masses ( $m_1 + m_2$ )

Also at equilibrium the moment about the point where the string holding the bar (where ( $m_1 +m_2$ ) and $m_3$ are hanged ) is attached is zero

So basically

$(m_1 + m_2 ) * 20 = m_3 * 30$

$(0.42 + 0.47) * 20 = 30 * m_3$

Making $m_3$ subject

$m_3 = ((0.42 + 0.47) * 20 )/(30 )$

$m_3 = 0.59 kg$

Can somebody plz answer this correct quickly!!!! :D(WILL MARK BRAINLIEST)
(Use google idc)

Answers

Answer:

I think the answer is, Both humans and whale embryos have a tail and a backbone (I'm not sure).

Explanation:

This is because, both human and whale embryos have a tail and a backbone.

Hope this helps! :D

The correct notation for an alpha particle

Answers

Answer:

α or He⁴₂

Explanation:

*The computer does not allow for the 4 and 2 to be directly inline

The alpha particle can be notated as a simple "α". Since that symbol is the letter alpha in Greek. Another way of notating the particle is "He⁴₂" (where the 2 is directly under the 4), this is because an alpha particle contains the exact same components of a helium nucleus, two protons, and two neutrons (with an atomic mass of four).

Can't find the options on the keyboard so ill try to describe it. I think either an He symbol or the greek letter alpha is accepted. There must be a 4 at the top left and a 2 at bottom left.

what is the kinetic energy of a 0.50 g insect traveling in a straight line at 5.0m/s? a)6.25J b) 1.25J

Answers

kinetic energy = 0.5 × mass × speed^2

Ek = 0.5 × 0.50 × 5^2

Ek = 6.25J

Is it possible to fly from Norway to USA across the North Pole?

Answers

Sure. The Earth is a sphere (ball-shaped), so you can follow practically
any route you want from one place to another. You could even fly from
New York to Chicago by way of the north pole.

If you want to draw a smooth curve from Oslo through the north pole to
a point in the USA, that's perfectly possible. But it's not the shortest way
to travel between those two points.

A charged object cannot attract a neutral object.
a. True
b. False

Answers

That's false. One of the first demonstrations of static attraction is
running a comb through your hair to charge it, and then using it
to pick up uncharged bits of tissue paper.

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