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FinnZ [79.3K]
3 years ago
14

A freezer has a coefficient of performance of 4.1. You place 0.45 kg of water at 16°C in the freezer, which maintains its temper

ature of -18°C. In this problem you can take the specific heat of water to be 4190 J/kg/K, the specific heat of ice to be 2100 J/kg/K, and the latent heat of fusion for water to be 3.34 ×105 J/kg. How much additional energy, in joules, does the freezer use to cool the water to ice at -18°C?
Physics
1 answer:
velikii [3]3 years ago
5 0
Ohh this is quite a lot umm i’ll be back hold on
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The area of the brain involved with comprehension of speech is
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Wernicke's area is where comprehension of speech is
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3 years ago
What are three disadvantages of making and using plastic? It pollutes the land and water. It requires cutting down trees for raw
alukav5142 [94]

Answer:

The correct answers would be option A, C and E.

Explanation:

A material made up of synthetic or semi synthetic compounds is called Plastic. This material is malleable and can be molded into solid form. There are many disadvantages of using the plastics. Three of the main disadvantages are :

- Plastic pollutes the land and water. Because it does not decay.

- Plastic takes an incredibly long time to break down.

- Plastic is not easy to recycle.

Above mentioned problems make the use of plastic so undesirable.

6 0
3 years ago
Read 2 more answers
A 3.75 kg ball is lifted from the floor to a height of 1.5 m above the floor. What is its increase in potential energy?
inysia [295]
<span>We can use a simple equation to calculate the increase in gravitational potential energy. PE = mgh m is the mass of the object g is the acceleration due to gravity h is the change in height PE = mgh PE = (3.75 kg) (9.80 m/s^2) (1.5 m) PE = 55.1 Joules The increase in gravitational potential energy is 55.1 Joules.</span>
4 0
3 years ago
A beam of light of wavelength lambda = 541nm is normally incident on a diffraction grating which has 600 lines m * m ^ - 1 Deter
MrMuchimi

Answer:

Angle of diffraction for second order maxima is θ = 18.941°

Explanation:

From the question it is given that

wavelength of incident light = λ = 541 nm = 541 x 10^-^9 m

order of maxima = n =2

diffraction grating has 600 lines per mm

⇒ distance between two slit is \frac{1mm}{600} = 1.66 x 10^-^6 m

using the relation of Braggs diffraction formula i.e.,

2dsinθ = nλ ..................................(1)

where, d = distance between two lines of grating

θ is the angle of diffraction

n= order of maxima

λ is the intensity of incident photon

on substituting the respected values in relation (1) we get,

2 x 1.66 x 10^-^6m sinθ = 2 x 541 x 10^-^9 m

⇒ sinθ = 0.3246

⇒ θ = sin^-^1(0.3246) = 18.941 °

8 0
3 years ago
A small spaceship whose mass is 1300 kg (including an astronaut) is drifting in outer space with negligible gravitational forces
Alexxandr [17]

Answer:

Explanation:

Relation between energy and momentum is as follows .

E = h c / λ

E / c = h / λ

h /λ = momentum of a photon

momentum of a photon  = E /c

= 11 x 10³ / 3 x 10⁸

= 3.67 x 10⁻⁵

In 4 days no of photon

= 4 x 24 x 60 x 60 = 345600 .

momentum of photon released

3.67 x 10⁻⁵  x 345600 .

= 12.68 kg m/s

This momentum will be imparted to spaceship .

12.68 = mv

12 .68 = 1300 x v

v = .00975 m /s

= 9.75 mm /s

8 0
3 years ago
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