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Natasha_Volkova [10]
3 years ago
14

A rock that contains enough of a particular substance to make it worth mining is called a(n) _____.

Physics
1 answer:
lora16 [44]3 years ago
4 0

Answer:

The answer is A .

Explanation:

Ore is a rock that requires mining .

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What needs to be the relation between the two forces to cause the upper magnet to float without moving?
OleMash [197]

Answer:

If it points the other way, the fields subtract, for a lower energy, and so the magnet prefers to turn to point in this way. Magnets in uniform fields feel torques which make them turn around if they are not pointing in the right direction, but there is no net force making the magnet want to levitate.

Explanation:

7 0
3 years ago
The mass of 29000 N elevator is
Lana71 [14]

<span>In this case we are given a force of 29,000 N. We know that the equation we  can use is:</span>

Force = mass * acceleration

 

However this is not just any type of force, because this is the weight of the elevator. So when the force is equal to weight, the acceleration acting is simply gravity. Therefore:

 

weight = mass * gravity

 

Calculating for mass:

mass = 29,000 N / (9.8 m/s^2)

<span>mass = 2,959.18 kg</span>

5 0
2 years ago
a 30 kg child is sitting 2 meters from the center of a merry go round. The coefficients of static and kinetic friction between t
laiz [17]

Answer: A

Explanation:

From the question, the given parameters are given.

Mass M = 30kg

Radius r = 2 m

Coefficient of static friction μ = 0.8

Coefficient of kinetic friction μ = 0.6

Kinetic friction Fk = μ × mg

Fk = 0.6 × 30 × 9.8

Fk = 176.4 N

The force acting on the merry go round is a centripetal force F.

F = MV^2/r

This force must be greater than or equal to the kinetic friction Fk. That is,

F = Fk

F = 176.4

Substitute F , M and r into the centripetal force formula above

176.4 = (30×V^2)/2

Cross multiply

352.8 = 30V^2

V^2 = 352.8/30

V = sqrt (11.76) m/s

V = 5.24 m/s

Therefore, the maximum speed of the merry go round before the child begins to slip is sqrt (12) m/s approximately

4 0
3 years ago
PLZ PLZ PLZ PLZ PLZ PLZ PLZ PLZ HELP​
lawyer [7]

Answer:

1 correct

2 wrong

3 wrong

4 correct

5 correct

Explanation:

Hope my answers help

8 0
2 years ago
Which of the following is a good electrical conductor ?
Helen [10]
Hey there! :D

Most good electrical conductors are metal. Actually, rubber is used around wires as an insulator to help the current stay in a direct flow. Wood and plastic don't handle current very well, as it will most likely burn the wood and melt the plastic. 

"D" Copper is the best answer. 

I hope this helps!
~kaikers <span />
8 0
3 years ago
Read 2 more answers
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