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Cloud [144]
3 years ago
5

Review the following list and select either an "h" if the item is a hazard, a "b" if it's a benefit, or "hb" if it can be both a

hazard and a benefit. pyroclastic flows volcanic ash geothermal energy lahars lava flows volcanic materials (pumice, lava rock)
Chemistry
2 answers:
pshichka [43]3 years ago
8 0
Pyroclastic flows, lava flows, and lahars are hazardous 
geothermal energy is beneficial
<span>volcanic ash</span> and volcanic materials can be both hazardous and beneficial

This questions somewhat depends on what the opinion who ever wrote the question so I don't know if all of what I said is correct according to your who wrote this but is what I believe is correct.  

I hope this helps.  Let me know if anything is unclear.
Finger [1]3 years ago
4 0

The answers are

pyroclastic flows-H

volcanic ash-HB

geothermal energy-B

lahar-H

lava flows-H

volcanic materials (pumice, lava rock)-B

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A 13-gram rubber stopper is attached to a 0.93-meter
makkiz [27]
<h3>Answer:</h3>

The centripetal acceleration is 26.38 m/s²

<h3>Explanation:</h3>

We are given;

  • Mass of rubber stopper = 13 g
  • Length of the string(radius) = 0.93 m
  • Time for one revolution = 1.18 seconds

We are required to calculate the centripetal acceleration.

To get the centripetal acceleration is given by the formula;

Centripetal acc = V²/r

Where, V is the velocity and r is the radius.

Since time for 1 revolution is 1.18 seconds,

Then, V = 2πr/t, taking π to be 3.142 ( 1 revolution = 2πr)

Therefore;

Velocity = (2 × 3.142 × 0.93 m) ÷ 1.18 sec

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Thus;

Centripetal acceleration = (4.953 m/s)² ÷ 0.93 m

                                        = 26.38 m/s²

Hence, the centripetal acceleration is 26.38 m/s²

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