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Sedaia [141]
3 years ago
15

Describe two ways minerals are used by people. Then explain how the increasing human population affects mineral use, and why thi

s could be a problem.
Physics
1 answer:
lianna [129]3 years ago
5 0

1. Just like vitamins, minerals help your body grow, develop, and stay healthy. The body uses minerals to perform many different functions, from building strong bones to transmitting nerve impulses. Some minerals are even used to make hormones or maintain a normal heartbeat.

2. Population growth is the increase in the number of people living in a particular area. Since populations can grow exponentially, resource depletion can occur rapidly, leading to specific environmental concerns such as global warming, deforestation and decreasing biodiversity.

Hope this helps.

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In a fluorescent tube of diameter 3 cm, 3 1018 electrons and 0.75 1018 positive ions (with a charge of e) flow through a cross-s
Vinil7 [7]

Answer:

The  current in the tube is 0.601 A

Explanation:

Given;

diameter of the fluorescent, d = 3 cm

negative charge flowing in the fluorescent tube, -e = 3 x 10¹⁸ electrons/second

positive charge flowing in the fluorescent tube, +e = 0.75 x 10¹⁸ electrons/ second

The current in the fluorescent tube is due to presence of positive and negative charges to create neutrality in the conductor (fluorescent tube).

Q = It

I = Q/t

where;

I is current in Ampere (A)

Q is charge in Coulombs (C)

t is time is seconds (s)

1 e = 1.602 x 10⁻¹⁹ C

3 x 10¹⁸ e/ s = ?

= (3 x 10¹⁸ e/s  x 1.602 x 10⁻¹⁹ C) / 1e

= 0.4806 C/s

negative charge per second (Q/t) = 0.4806 C/s

positive charge per second (Q/t) =  (0.75 x 10¹⁸ e/s  x 1.602 x 10⁻¹⁹ C) / 1e

positive charge per second (Q/t) = 0.12015 C/s

Total charge per second in the tube, Q / t = (0.4806 C/s + 0.12015 C/s)

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Therefore, the  current in the tube is 0.601 A

7 0
3 years ago
A positive charge is moved from one point to another point along an equipotential surface. The work required to move the charge:
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Answer:

b . is zero.

Explanation:

An Equipotential surface is the one that has electric potential same throughout the surface. The formula for work done in an electric field is given by

dW= qdV

Now, in an Equipotential surface dV= 0.

Hence the work done in moving a charge from one place to the other in an electric field is zero.

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From the frame of reference of car 2, what is the velocity of car
Alborosie
It’s is the last one d
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Why does an ice cube melt in your hand? Question 3 options: The ice remains in a solid state even though heat is applied The tem
iVinArrow [24]

Answer:

3rd choice

Explanation:

heat is transfered causing it to melt

6 0
3 years ago
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Which purpose does a light bulb serve in a circuit?
aliina [53]

Answer:

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Explanation:

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