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3 years ago

Look at pic for question pls help

Physics

1 answer:

pentagon [3]3 years ago

5 0

B IS YOUR ANSWER.

Soft sound has small amplitude and louder sound has large amplitude. Since, the second wave has large amplitude, it will have the loudest sound.

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Liquids and gases transfer heat by ____.

vodka [1.7K]

Fluids always transfer heat by convection. So, your answer is B. That's how a oven works actually!

3 0

4 years ago

Read 2 more answers

1 point

Sav [38]

Answer:

388.5J

Explanation:

Given parameters:

Weight = 70N

Height = 5.55m

Unknown:

Gravitational potential energy at the top of the ladder = ?

Solution:

The gravitational potential energy is the energy due to the position of the body.

Gravitational potential energy = Weight x height

So;

Gravitational potential energy = 70 x 5.55 = 388.5J

8 0

3 years ago

Only 25% of the intensity of a polarized light wave passes through a polarizing filter. What is the angle between the electric f

Firdavs [7]

Answer: Only 25% of the intensity of a polarized light wave passes through a polarizing filter. Then the angle between the electric field and the axis of the filter will be 60 degrees.

Explanation: To find the answer of the problem given, we have to know about the Malu's law of polarization.

<h3>What is Malu's law of polarization?</h3>

This law states that, when a beam of completely polarized light is passed through an analyzer, then then intensity I of the transmitted light varies directly as the square of the angle $\alpha$ between the transmission direction of the polarizer and the analyzer.
The expression for this law will be,

$I=I_0cos\alpha$

Where, I₀ is the maximum intensity of the transmitted light through the polarizer.

<h3>How to solve the problem?</h3>

From the question, it is clear that, the 25% of the intensity of a polarized light wave passes through the filter.

$\frac{I}{I_0} =0.25\\$

Thus, the angle between electric field and the axis of the filter is,

$cos^2\alpha =0.25\\cos\alpha =\sqrt{0.25} =0.5\\\alpha =cos^-1(0.5)=60 degrees$

Thus, we can conclude that, the angle between the electric field and the axis of the filter will be 60 degrees.

Learn more about the Malus law of polarization here:

brainly.com/question/28020002

#SPJ4

4 0

2 years ago

A cylindrical barrel is completely full of water and sealed at the top except for a narrow tube extending vertically through the

astraxan [27]

To solve this problem it is necessary to apply the concepts related to pressure as a unit that measures the force applied in a specific area as well as pressure as a measurement of the density of the liquid to which it is subjected, its depth and the respective gravity.

The two definitions of pressure can be enclosed under the following equations

$P = \frac{F}{A}$

Where

F= Force

A = Area

$P = \rho gh$

Where,

$\rho =$ Density

g = Gravity

h = Height

Our values are given as,

$d = 0.8m \rightarrow r = 0.4m$

$A = \pi r^2 = \pi * 0.4^2 = 0.503m^2$

If we make a comparison between the lid and the tube, the diameter of the tube becomes negligible.

Matching the two previous expressions we have to

$\frac{F}{A} = \rho g h$

Re-arrange to find h

$h = \frac{F}{A\rho g}$

$h = \frac{390}{(0.503)(1000)(9.8)}$

$h = 0.079m$

$h = 7.9cm$

Therefore the height of water in the tube is 7.9cm

8 0

3 years ago

A researcher wants to know the effect of lighting on snacking behavior. He knows that young adults normally eat an average of =

horrorfan [7]

Answer:

It does not impact snacking behavior.

Explanation:

The mean of the study was 18.7 grams, which is only 2.3 grams below the actual average grams of snacks that an adult would consume while at work, after revising this you could say that theres a significant reduction, but then the standard deviation is 9.1 this means that there are still adults that are eating more than 21 gram of snacks, so the test would result inconclusive.

8 0

4 years ago