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iris [78.8K]
3 years ago
9

What is the difference between a mineral, a crystal and a gem?

Physics
1 answer:
pogonyaev3 years ago
3 0

Answer:

Minerals occur naturally in the earth's crust and are defined as inorganic solids that have characteristic chemical composition and crystalline structures. ... A gemstone or gem is a piece of mineral crystal, which, in cut and polished form, is used to make jewelry or other adornments.

Explanation:

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If a 4 Ω resistor, a 7 Ω resistor, and a 12 Ω resistor are connected in a series, which resistor has the most current in it?
Pani-rosa [81]
The current is the same at every point in a series circuit, so
each of those resistors has the same current flowing through it.

The current in that particular circuit is

             (battery voltage) / (23)            amperes.
3 0
3 years ago
An object is travels 50 m in 4 s. It had no initial velocity and experiences constant acceleration. What is the magnitude of the
alisha [4.7K]

Answer:

Explanation:

s = s₀ + v₀t + ½at²

50 = 0 + 0(4) + ½a(4²)

50 = 8a

a = 50/8 = 6.25 m/s²

5 0
3 years ago
A ball is dropped from a cliff and has an acceleration of 9.8 m/s^2 how long will it take the ball to reach a speed of 24.5 m/s
Fiesta28 [93]
<span>Acceleration of ball (a) = 9.8 m/s^2 Speed (v) = 24.5 m/s Time (t) = Acceleration / Time = v / a = 24.5/9.8 = 2.5 s So it will take 2.5 seconds to reach that speed.</span>
5 0
3 years ago
A mouse is walking at 2.45 m/s. He sees a cat and accelerates at 4.92 m/s/s. How much time does it take him to reach a speed of
alexandr1967 [171]
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5 0
3 years ago
A 24-cm-diameter vertical cylinder is sealed at the top by a frictionless 15 kg piston. The piston is 90 cm above the bottom whe
abruzzese [7]

Answer:

(A) P_i=3249.41\ Pa

(B) V_f=0.3358\ m

Explanation:

Given:

  • diameter of the cylinder, d= 0.24\ m
  • mass of piston sealing on the top, m_p=15\ kg
  • initial temperature of the piston, T_i=315+273= 588\ K
  • initial height of piston, h_i=0.9\ m
  • atmospheric pressure on the piston, p_a=1 atm=101325\ Pa

(A)

<u>Initial pressure of gas is the pressure balanced by the weight of piston:</u>

P_i=\frac{m_p.g}{\pi.d^2\div 4}

P_i=\frac{15\times 9.8}{\pi\times (0.24^2\div 4)}

P_i=3249.41\ Pa

<em>Which is gauge pressure because it is measured with respect to the atmospheric pressure.</em>

(B)

Given:

  • Final temperature, T_f=18+273=291\ K

<u>Now, volume of air initially in the cylinder:</u>

V_i=\pi.d.h_i

V_i=\pi\times 0.24\times 0.9

V_i=0.6786\ m^3

Using gas law:

\frac{P_i V_i}{T_i}= \frac{P_f V_f}{T_f} ........................................(1)

<em>∵In every condition of equilibrium the gas pressure will be balanced by the weight of the piston so it is an </em><em>isobaric transition</em><em>.</em>

∴P_i=P_f

<u>Hence eq. (1) is reduced to:</u>

\frac{V_i}{T_i}= \frac{V_f}{T_f}

putting respective values:

\frac{0.6786}{588}= \frac{V_f}{291}

V_f=0.3358\ m

6 0
4 years ago
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