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3 years ago

Question 8, is it A or B?

Physics

1 answer:

Brrunno [24]3 years ago

7 0

Answer:

Explanation:

protons are the postive charge in your nucleus in the cell

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Why polarization does not occur in dry cell?

Arisa [49]

Answer:

Manganese oxide prevents polarisation in dry cells. - Polarization is a defect that occurs in simple electric cells due to the accumulation of hydrogen gas around the positive electrode. ... - MnO2 reacts with H2 and forms water as byproduct, so depolarization doesn't occur.

7 0

3 years ago

Sound travels at about 360 meters/sec. What is the wavelength of sound with a

ollegr [7]

<u>Answer:</u>

0.24 m

<u>Explanation:</u>

Given:

Wave velocity ( v ) = 360 m / sec

Frequency ( f ) = 1500 Hz

We have to calculate wavelength ( λ ):

We know:

v = λ / t [ f = 1 / t ]

v = λ f

= > λ = v / f

Putting values here we get:

= > λ = 360 / 1500 m

= > λ = 36 / 150 m

= > λ = 0.24 m

Hence, wavelength of sound is 0.24 m.

6 0

3 years ago

A projectile falls beneath the straight-line path it would follow if there were no gravity. How many meters does it fall below t

maria [59]

Answer:

Explanation:

Suppose v is the initial velocity and $\theta$ is the angle of inclination

distance traveled in vertical direction in t=1 s

When gravity is present

$y=vt+\frac{1}{2}at^2$

where $y=vertical\ distance$

$a=acceleration$

$t=time$

$v=initial\ velocity$

here initial velocity is v\sin \theta [/tex] so

$y=v\sin \theta \times 1-\frac{1}{2}gt^2$

$y=v\sin \theta -0.5g$

In absence of gravity

$y_2=v\sin \theta \times t$

$y_2=v\sin \theta \times 1$

$\Delta y=y_2-y=v\sin \theta -v\sin \theta +0.5 g=4.9\ m$

4 0

3 years ago

As a person squeezes and applies pressure to the outside of a balloon, air particles inside

mixas84 [53]

The air particle inside the balloon will collide more with each other and the temperature inside the balloon will increase.

As a person squeezed and applies the pressure to the outside of a balloon, the air particle inside the balloon gains energy and collide with each other, the particle of the air also try leave the balloon surface will implies equal pressure on the wall of the balloon, as the pressure outside the balloon increase, the inside pressure will also increase.

7 0

3 years ago

Calculate the density of paraffin oil, if a glass capillary of diameter 0.25mm dipped in paraffin oil of the surface tension 0.0

yaroslaw [1]

<h3>Answer:</h3>

The density of paraffin oil is : 882.86kg/m3

using the formula : h = 2TcosФ/rβg

where:

h = capillarity rise

T = surface tension

β = density

r = radius of the capillary tube

∅ = angle of contact

Explanation:

<h3>meaning of capillarity and surface tension</h3>

capillarity is the rise and fall of liquid in a narrow capillarity tube. the rise and fall of the liquid depends on the surface tension, the diameter of the bore, density, acceleration due to gravity and angle of contact.

<h3>meaning of angle of contact</h3>

angle of contact helps to know if liquid in a capillary tube will spread or form droplets on the surface of the capillary tube. if the angle is acute, liquid will spread, if obtuse, droplets are formed.

<h3>given data:</h3>

T = 0.0245N/m

r = diameter/2 = 0.25/2 = 0.125mm convert to metre which is = 0.125 x $10^{-3}$