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3 years ago

What does density have to do with heat?

2 answers:

8 0

If you take a fluid (i.e. air or water) and heat it, the portion that is heated usually expands. The same mass takes up more volume and as a consequence the heated portion becomes less dense than the portion that is not heated.

Vadim26 [7]3 years ago

7 0

Cooling a substance causes molecules to slow down and get slightly closer together, occupying a smaller volume that results in an increase in density. Hot water is less dense and will float on room-temperature water. Cold water is more dense and willsink in room-temperature water.

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The energy of a photon of light is __________ proportional to its frequency and __________ proportional to its wavelength.

icang [17]

Answer:

D) directly, inversely

Explanation:

The energy of a photon of light is directly proportional to its frequency and inversely proportional to its wavelength.

Frequency is the number of waves that passes through a point per unit of time.

Wavelength is the is the distance between successive crests or troughs on a wave.

Mathematically, frequency is related to wavelength and velocity using;

Energy = h x f

where h is the Planck's constant

f is the frequency

Since c = f ∧

where f is the frequency of the wave

∧ is the wavelength of the wave

c is the speed of light

So;

f = c/∧

Therefore;

E = $\frac{h c}{wavelength}$

From the equation, we see an inverse relationship between E and wavelength and a direct one with frequency.

6 0

3 years ago

Pre-Test Active

vlada-n [284]

n is the answer I guess

not so sure

7 0

2 years ago

What is the kinetic energy of a 144 gram baseball moving at a velocity of 38.7 meters per second?

gulaghasi [49]

Answer:

The kinetic energy of the baseball is 107.83 J

Explanation:

Given;

mass of the baseball, m = 144 g = 0.144 kg

velocity of the baseball, v = 38.7 m/s

The kinetic energy of the baseball is given by;

K.E = ¹/₂mv²

where;

m is mass of the object

v is speed of the object

K.E = ¹/₂(0.144)(38.7)²

K.E = 107.83 J

Therefore, the kinetic energy of the baseball is 107.83 J

8 0

3 years ago

Now instead a 3-mw laser of wavelength λ = 760 nm is directed into the interferometer (with the mirror m1 at the displacement ca

slavikrds [6]

power received will always remain same and does not depends on the distance

it will be same as the power of source

$P = 3 mW$

now the energy released by one photon is given as

$E = \frac{hc}{\lambda}$

$E = \frac{6.6* 10^{-34}* 3 * 10^8}{760 * 10^{-9}}$

$E = 2.6 * 10^{-19} J$

now let say N photons per second released

$N * 2.6 * 10^{-19} = 3 * 10^{-3}$

$N = 1.15* 10^{16} per\: second$

7 0

3 years ago

While accelerating at 5.22 m/s/s an object changes its velocity from 6.73 m/s to 29.88 m/s. Over what

yan [13]

Answer:

Explanation:

v² = u² + 2as

s = (v² - u²) / 2a

s = (29.88² - 6.73²) / (2(5.22))

s = 81.1802203065...

s = 81.18 m

4 0

3 years ago