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3 years ago

Which is an example of sound energy?

Physics

1 answer:

____ [38]3 years ago

4 0

Radio, speaker, drums, alarm clock Anything that makes a sound!

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A system does 506 kj of work, and loses 266 kj of heat to the surroundings. what is the change in internal energy of the system?

babunello [35]

Answer:

The change in internal energy of the system = -772kJ

Explanation:

Given :

Heat lost by the system , a = -266KJ

Workdone by the system, W = -506KJ

The first law of thermodynamics states that:

Change in internal energy = q + w

Substituting values into the equation

Change in internal energy = (-266KJ) + (-506KJ)

Change in internal energy = -722KJ

7 0

3 years ago

Read 2 more answers

You buy a magnifying glass at the store. The lens in the magnifying glass is a double convex lens, a lens with two convex curved

Leokris [45]

Answer:

30 cm

Explanation:

f = Focal length = 25 cm

R = Radius of curvature (both sides are equal)

$\mu$ = Refractive index of lens = 1.6

The lens maker formula is given by

$\frac{1}{f}=(\mu-1)(\frac{1}{R_1}-\frac{1}{R_2})\\\Rightarrow \frac{1}{f}=(\mu-1)(\frac{1}{R}-\frac{1}{-R})$ minus sign because it is on the other side

$\\\Rightarrow \frac{1}{f}=(\mu-1)\frac{2}{R}\\\Rightarrow R=2(\mu-1)f\\\Rightarrow R=2(1.6-1)\times 25\\\Rightarrow R=30\ cm$

The radius of curvature of the glass surface is 30 cm

8 0

4 years ago

What is the volume in liters of the basketball?

babymother [125]

he basket ball diameter used by NBA men players is around 9.55 inches

So diameter = 9.55 inch = 0.243 m

So radius of basket ball = 0.1215 m

Volume , $V=\frac{4}{3} \pi r^3$

$V = \frac{4}{3}* \pi *0.1215^3=0.0075 m^3=7.5 L$

So volume of basket ball used by men NBA players = 7.5 L

5 0

3 years ago

Read 2 more answers

an object is 40M below the surface of sea water of density 1020 kg/m3 calculate the pressure difference

olga nikolaevna [1]

Answer:

P = 400248 [Pa]

Explanation:

We can calculate the hydrostatic pressure exerted by a column of liquid by means of the following equation.

$P=Ro*g*h$

where:

Ro = density = 1020 [kg/m³]

g = gravity acceleration = 9.81 [m/s²]

h = depth = 40 [m]

Therefore:

$P=1020*9.81*40\\P=400248 [Pa]$

8 0

3 years ago

ANSWER ASAP PLS!!!

kodGreya [7K]

Answer:

A solenoid field is increased with the increase in the current flow through the coil.

Explanation:

A solenoid is a current carrying coil with a significant number of loops. It works like an electromagnet inside which, a uniform and strong magnetic field is created. The magnetic field outside the solenoid field is nearly zero but not exactly zero.

While experimenting with the solenoid, scientists came to know that the magnetic field generated by the solenoid increases with the increase in the current, flowing through the solenoid.

The magnetic field works strongly around the arena of coil. The field changes its direction only near the ends and gets weak. Else its uniform throughout the loops.

The magnetic field inside the solenoid can be formulated as,

$B=\mu n I$

Where,

B = Magnetic field generated by the solenoid

$\mu$ = Constant

I = Current flowing through the loops of the solenoid

5 0

3 years ago