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4 years ago

7

10 PTS!!!! Why are there only two possible combinations of DNA base pairs?

1 answer:

Mila [183]4 years ago

7 0

A (adenine) - T (Thymine)
C (cytosine) - G (Guanine)

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List and describe the three types of galaxies.

Andrei [34K]

Answer:

According to NASA and their Hubble Space Telescope, we have 4 different types of galaxies, the 3 main ones being elliptical, spiral, and irregular.

Explanation:

Elliptical galaxies are shaped almost like an oval. They do not have any "arms" like you imagine in most galaxies, like our own Milky Way. An example would be galaxy ESO 325-G004.

Spiral galaxies are shaped almost like a circle and has arms "spiraling" out from the center. An example of a spiral shaped galaxy would be our own galaxy, the Milky Way.

Irregular galaxies do not have a definite shape. They are usually shaped randomly and can consist of any shape. An example would be galaxy NGC 1569.

The 4th and obscene type of galaxy is called the Lenticular galaxy. This is simply almost like a cross section between an elliptical galaxy and a spiral galaxy combined together. It is shaped like a disk and has no arms. An example would be galaxy NGC 5010.

5 0

3 years ago

When an aluminum bar is connected between a hot reservoir at 860 K and a cold reservoir at 348 K, 2.40 kJ of energy is transferr

Natalija [7]

Answer:

a) $\Delta S_{in} = 2.791\,\frac{J}{K}$ , b) $\Delta S_{out} = 6.897\,\frac{J}{K}$ , c) $S_{gen} = 4.106\,\frac{J}{K}$ , d) Due to irreversibilities due to temperature differences.

Explanation:

a) The change in entropy of the hot reservoir is:

$\Delta S_{in} = \frac{2400\,J}{860\,K}$

$\Delta S_{in} = 2.791\,\frac{J}{K}$

b) The change in entropy of the cold reservoir is:

$\Delta S_{out} = \frac{2400\,J}{348\,K}$

$\Delta S_{out} = 6.897\,\frac{J}{K}$

c) The total change in entropy of the Universe is modelled after the Second Law of Thermodynamics. Let assume that process is steady:

$\Delta S_{in} - \Delta S_{out} + S_{gen} = 0$

$S_{gen} = \Delta S_{out} - \Delta S_{in}$

$S_{gen} = 6.897\,\frac{J}{K} - 2.791\,\frac{J}{K}$

$S_{gen} = 4.106\,\frac{J}{K}$

d) Since irreversibilities create entropy as process goes by. The main source of irreversibilities is the existence of temperature differences.

6 0

3 years ago

(12 points) When forces are UNBALANCED on an object, the object could: (Choose all that apply)

charle [14.2K]

As per Newton's law when unbalanced force is acting on the object

$F = ma$

so acceleration of the object is given as

$a = \frac{F}{m}$

since object is accelerating here so we can say that due to unbalanced force there must be change in velocity of the object

So correct answer regarding change in velocity must be given as

<u>3. Decelerate </u>

<u>4. Stop moving </u>

<u>5. Accelerate </u>

<u>7. Start moving</u>

7 0

4 years ago

How do you calculate the moment of inertia of a flywheel <br>

worty [1.4K]

Answer:Ef = 1/2 I ω2 (1)

where

Ef = flywheel kinetic energy (Nm, Joule, ft lb)

I = moment of inertia (kg m2, lb ft2)

ω = angular velocity (rad/s)

Explanation:

4 0

4 years ago

A ray of light approaches a jar of honey at an angle of 30.0. If the angle of refraction is 19.5, what is the refractive index o

Stels [109]

Answer:

n = 1.49

Explanation:

Given that,

Angle of incidence = 30 degrees

Angle of refraction = 19.5 degrees

We need to find the refractive index of the honey. Using Snell's law, we can find it as follows :

$n=\dfrac{\text{sin i}}{\text{sin r}}\\\\=\dfrac{\text{sin 30}}{\text{sin 19.5}}\\\\n=1.49$

So, the refractive index of honey is 1.49.

7 0

3 years ago