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3 years ago

Hello :) how to do this qn?

Physics

2 answers:

Vladimir79 [104]3 years ago

8 0

Answer:

Explanation:

When we see a U- tube manometer, the first concept that we should think about is pressure. This is because manometers are used to measure pressure.

Any point of the manometer at the same vertical height has the same pressure. Thus, if we look at the dotted line in the diagram, the pressure is equal at any point along that line. Let's compare both sides of the manometer with each other.

Fluid pressure (P)

P= ρgh,

where ρ= density of the fluid,

g= acceleration due to gravity,

h= height of fluid

Pressure is defined as the amount of force exerted per unit area. Thus, pressure along the dotted line in the manometer is due to the force exerted by the column of fluid above it, as well as the force exerted by the atmospheric pressure. We can disregard the force due to atmospheric pressure since the atmospheric pressure exerted on both sides of the manometer is the same.

Pressure due to water= pressure due to oil

1(g)(8)= ρ(g)(10)

The value of g would be the same on the right and left side of the manometer and hence we can cancel it out.

8= 10ρ

ρ= 8 ÷10

ρ= 0.8 g/cm³

Finger [1]3 years ago

3 0

The answer is B because oil = blockage of air and it pressures the water to be density of 0.90

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Answer:

C) True. At maximum displacement, its instantaneous velocity is zero.

Explanation:

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A = A cos wt

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We replace the speed

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Speed is maximum

Let's review the claims

A) False. Speed is zero

B) False. It can be determined

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3 years ago

Calculate The voltage if the current passing through the wire is 3A, and has a resistance of 10 Q

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We use the formula V=IR where I is current, v is voltage, and R is resistance. This is V=(3)(10) which is 30 Volts, answer choice (c)

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2 years ago

Compare the strengths of UV light and microwaves (in Hz). Which type of light is more powerful and how do you know?

TEA [102]

Answer:

UV light is more powerful as it has greater energy.

Explanation:

The energy propagated by electromagnetic waves ( light ) through vacuum or medium is known as electromagnetic radiation.

The frequency/wavelength range of electromagnetic radiation is known as electromagnetic spectrum. The electromagnetic spectrum ranging from gamma ray to radio waves.

Frequency range of UV light = ( 8 x 10¹⁴ to 3 x 10¹⁶ ) Hz

Frequency range of Microwaves = ( 300 x 10⁶ to 300 x 10⁹ ) Hz

Ratio of UV light to Microwaves = ( $\frac{8\times10^{14} }{300\times10^{6} }$ to $\frac{3\times10^{16} }{300\times10^{9} }$ )

= ( 2.66 x 10⁶ to 1 x 10⁸ )

Energy of electromagnetic radiation is given by the relation:

E = hν

Here h is plank's constant and ν is frequency.

UV light is more powerful than Microwaves as frequency of UV light is greater than frequency of microwaves. Thus, by the above equation, the energy of UV light is more than energy of Microwaves.

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3 years ago

Click on the ray diagram that shows the proper positioning of an image formed by a concave lens.

Reika [66]

I don't think so

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Explanation:

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2 years ago

17. A volleyball weighs about 300 grams.

atroni [7]

Answer:

PE = 44.1 J

Explanation:

Ok, to have the specific data, the first thing we must do is convert from grams to kilograms. Since mass must always be in kilograms (kg)

We have:

1 kilograms = 1000 grams.

We convert it using a rule of 3, replacing, simplifying units and solving:

$\boxed{\bold{x=\frac{gr*1\ kg}{1000\ gr}=\frac{300\ gr*1\ kg}{1000\ gr}=\frac{300\ kg}{1000}=\boxed{\bold{0.3\ kg}}}}$

==================================================================

Earth's gravity is known to be 9.8 m/s², so we have:

Data:

m = 0.3 kg
g = 9.8 m/s²
h = 15 m
PE = ?

Use formula of potencial energy:

$\boxed{\bold{PE=m*g*h}}$

Replace and solve:

$\boxed{\bold{PE=0.3\ kg*9.8\frac{m}{s^{2}}*15\ m}}$

$\boxed{\boxed{\bold{PE=44.1\ J}}}$

Since the decimal number, that is, the number after the comma is less than 5, it cannot be rounded, then we have this result.

The potential energy of the volleyball is 44.1 Joules.

Greetings.

8 0

3 years ago