A rock containing valuable minerals that can be mined is called an ore. The correct option is C.
Ore is a deposit of one or more valuable minerals present inside the Earth's crust.
Metals essential to industry and trade, such as copper, gold, and iron, are found in the most valuable ore deposits. Copper ore is mined for a number of industrialapplications.
Ore is natural rock or sediment that contains one or more valuable minerals, usually metals, and can be mined, treated, and sold for a profit.
Mining extracts ore from the Earth, which is then treated or refined, often through smelting, to extract valuable metals or minerals.
Crushing the rock is the first step in extractingore from it. Heap leaching, flotation, or smelting are methods for extracting ore from rock.
Thus, the correct option is C.
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Answer:
radio waves
microwaves
Pressure is a measure of force per unit area:
P = F/A
The water exerts a pressure of 202 kPa = 202,000 Pa on the diver, who has a surface area of 1.50 m². Then the force exerted by the water is F such that
F = PA
F = (202,000 Pa) (1.50 m²)
F = 303,000 N = 303 kN
Answer:
The minimum current rating of the motor disconnecting means is 165 Amperes.
Explanation:
First convert the given power into units of watt. Since,
1 horsepower = 746 watts
Therefore,
40 horsepower = 40 x 746 watts
40 horsepower = 29840 watts
Since, we know that:
Power = Full Load Current (FLC) x Voltage
FLC = Power/Voltage
FLC = 29840 watts/208 volts
FLC = 143.46 Amperes
Now, the current for disconnecting means is at least 115% of the FLC, for the motors rated at 600 Volts or less.
Current for Disconnecting Means = (1.15)(143.46 A)
Current for Disconnecting Means = 165 Amperes