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3 years ago

Please select the word from the list that best fits the definition how light is reflected from a mineral

Physics

2 answers:

Novosadov [1.4K]3 years ago

7 0

The word is "luster".

stealth61 [152]3 years ago

7 0

Answer: Luster is the correct answer

Explanation:

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Which of the following describes an isotope?

algol13

Answer:

2. atoms of an element that have the same number of protons and a different number of neutrons

Explanation:

Isotopes of an element is made up of atoms of an element that have the same number of protons and a different number of neutrons.

The number of protons are the positively charged particles in an atom

The number of neutrons are the uncharged particles.

Isotopy is the existence of two or more atoms of the same element having the same atomic number but different mass numbers due to the differences in the number of neutrons in their carious nuclei.

Isotopes have have the same electronic configuration and hence will have similar chemical properties. They only differ in their masses.

8 0

3 years ago

3. Liquid nitrogen at 90 K, 400 kPa flows into a probe used in a cryogenic survey. In the return line the nitrogen is then at 16

devlian [24]

Answer:

Specific heat transfer = 236.16 kJ/kg

Ratio of return velocity to inlet velocity = 0.80

Explanation:

Given

Temperature of liquid nitrogen, T1 = 90 K

Pressure of liquid nitrogen, P1 = 400 kPa

Temperature of nitrogen, T2 = 160 K

Pressure of nitrogen, T2 = 400 kPa

A(e) = 100 A(i)

To solve, we use the formula

h(i)+ 1/2v(i)² + q = h(e) + 1/2v(e)² + q

The mass flow is

m = m(i) = m(e)

m = (Av/V)i = (Av/V)e

Ratio of return velocity to inlet velocity is

v(e) / v(i) = A(i)/A(e) * V(e)/V(i)

v(e) / v(i) = 1/100 * V(e)/V(i)

From the saturated Nitrogen table, at 100 K, we have

h(i) = h(f) = -73.2

v(i) = v(f) = 0.001452

From the saturated Nitrogen table again, at 160 K and 400 kPa

h(e) = 162.96 kJ/kg

v(e) = 0.11647 m³/kg

Substituting these in the formula, we have

v(e) / v(i) = 1/100 * 0.11647/0.001452

v(e) / v(i) = 1/100 * 80.2

v(e) / v(i) = 0.80

Energy equation is given by

q + h(i) = h(e)

q = h(e) - h(i)

Now, calculating specific heat transfer

q = 162.96 - -73.2

q = 236.16 kJ/kg

6 0

3 years ago

For his science project, Austin wants to determine if the pH of standing rainwater changes

egoroff_w [7]

C should be it. Correct me if im wrong xd

6 0

3 years ago

Read 2 more answers

Two concentric current loops lie in the same plane. The smaller loop has a radius of 3.6 cm and a current of 12 A. The bigger lo

puteri [66]

Answer:

the radius of bigger loop = 6 cm

Explanation:

given,

two concentric current loops

smaller loop radius = 3.6 cm

]current in smaller loop = 12 A

current in the bigger loop = 20 A

magnetic field at the center of loop = 0

Radius of the bigger loop = ?

$B_t = B_1 + B_2$

$0 = \dfrac{\mu_0I_1}{2R_1} +\dfrac{\mu_0I_2}{2R_2}$

now, on solving

$\dfrac{I_1}{R_1} = \dfrac{I_2}{R_2}$

$R_2 = I_2\dfrac{R_1}{I_1}$

= $20\times \dfrac{3.6}{12}$

= 6 cm

hence, the radius of bigger loop = 6 cm

7 0

3 years ago

A railroad tank car contains milk and rolls at a constant speed along a level track. The milk begins to leak out the bottom. The

kifflom [539]

Answer:

option C

Explanation:

The correct answer is option C

There is no external force acting in the system hence the momentum will be conserved.

As the milk is leaking out of the tank mass of the tanker is decreasing.

When the mass of the container will decrease to conservation the momentum speed of the container will have to be increased.

So, the car carrying milk will speed up.

8 0

3 years ago