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3 years ago

What are the coefficients in this expression?

Physics

2 answers:

skad [1K]3 years ago

7 0

6 and $\frac{1}{3}$

Explanation:

The expression:

6a - $\frac{3}{4} + 7.5 - \frac{b}{3}$

A coefficient is a numerical constant usually placed before a variable in an expression.

They are used to multiply variables.

Given equation is;

$6a - \frac{3}{4} + 7.5 - \frac{b}{3}$

There are two variables in this expression which are;

a and - b

$6 (a) - \frac{3}{4} + 7.5 - b (\frac{1}{3} )$

The coefficients in this expression are:

6 and $\frac{1}{3}$

learn more:

Quadratic equation brainly.com/question/1357167

#learnwithBrainly

bekas [8.4K]3 years ago

5 0

Answer:

6 and Negative one-third (D)

Explanation:

eDgE

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What is the path of an electron moving at 4 000 m/s perpendicular to a magnetic field of 1.5 T? (me = 9.11 x 10^-31kg)

morpeh [17]

Answer:

$15.18\times 10^{-9} m$

Explanation:

Radius of the path of electron which is moving perpendicular to magnetic field is defined as,

$r=\frac{mv}{qB}$

Here, m is the mass of electron, v is the velocity of electron, q is the charge on electron, and B is the magnetic field.

Given that, the velocity of electron is, $v=4000m/s$ .

And the magnetic field is $B=1.5T$ .

And the mass of electron is, $m=9.11\times10^{-31}kg$

And the charge on electron is, $q=1.6\times 10^{-19}C$

Put all these values in radius equation,

$r=\frac{9.11\times10^{-31}kg\times 4000m/s }{1.6\times 10^{-19}C\times 1.5T}\\r=15.18\times 10^{-9} m$

Therefore, the path radius of a moving electron is $15.18\times 10^{-9} m$

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4 years ago

Why do the north and south poles of these magnets attract each other? A. The magnetic fields of the two magnets repel each other

Jlenok [28]

Answer:

D makes the most sense to me.

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3 years ago

Read 2 more answers

A 10 kg ball is swung in a horizontal circle at the end of a 2 - m rope over a persons head. The ball makes 30 revolutions per m

steposvetlana [31]

Answer : T = 2 s and Speed = 6.28 m/s.

Explanation :

It is given that,

Mass of the ball, m = 10 kg

Radius of the circle, r = 2 m

The ball makes 30 revolutions per minute. So, frequency is given by :

$f=\dfrac{30}{60\ s}$

$f=\dfrac{1}{2}\ Hz$

We know that time period is defined as the reciprocal of frequency i.e.

$T=\dfrac{1}{f}$

$T=2\ s$

So, the time period for the ball to go around once is 2 s.

Now, speed is defined as distance travelled per unit time. Distance travelled by ball in circular path is equal to the circumference of the circle.

$Speed =\dfrac{distance}{time}$

$S=\dfrac{2\pi r}{T}$

$S=\dfrac{2\times 3.14\times 2\ m}{2\ s}$

$S=6.28\ m/s$

Speed of the ball is 6.28 m/s.

8 0

3 years ago

Which has the highest heat capacity? (values of heat capacities and calculations are unnecessary).

KATRIN_1 [288]

Water has the maximum specific heat capacity of any fluid.

The amount of heat that one gram of a material needs either absorb or lose in order to alter its temperature by a degree Celsius is known as specific heat. This equates to one caloric, or 4.184 Joules, for water.

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Consider the amount of time it takes for a pot to get warm to the touch on the stove as opposed to how long it takes for the water within to warm up.
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Although the hydrogen bonds in water are much too weak to be compared to intra - molecular bonds like covalently or ionic bonds, they are nevertheless strong enough to require a lot of energy to break. Water boils at 100°C for this reason.

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SPJ4

5 0

1 year ago

I'm not sure what to use help me please

DaniilM [7]

Answer:

Mass of the ring is 2.5 kg.

Given:

Moment of inertia of a ring = 0.4 kg. $m^{2}$

Radius = 40 cm = 0.4 m

To find:

Mass of the ring = ?

Formula used:

I = m $r^{2}$

Where I = moment of inertia

r = radius of the ring

m = mass of the ring

Solution:

Moment of inertia of a ring is given by,

I = m $r^{2}$

Where I = moment of inertia

r = radius of the ring

m = mass of the ring

0.4 = m ×0.4×0.4

m = 0.4/(0.4×0.4)

m = 1/0.4

m = 2.5 kg

Mass of the ring is 2.5 kg.

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3 years ago