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Naddika [18.5K]
3 years ago
9

Alkali metals are extremely reactive because they a. have very small atomic masses. b. are not solids at room temperature.

Physics
1 answer:
irinina [24]3 years ago
5 0

Answer:

a.

Explanation:

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A boy takes 20 minutes to cover 3.2 km on a bicycle find the speed in km/hr​
Murrr4er [49]

Answer:

9.6 km/h

Explanation:

20 minutes=1/3 minute.

The speed of the bicycle: 3.2:1/3=9.6 km/h.

Answer: 9.6 km/h

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2 years ago
What is Physics? How is Physics used in your everyday life? Give at least two examples and explain your answer. You need at leas
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2 years ago
What does muttered mean
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Muttered is the same thing like mumble. It's like when you are speaking and no one couldn't hear what you said. So Muttered is when you say something low .
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2 years ago
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brilliants [131]

A negative to a negative charge will make a neutral charge.

4 0
2 years ago
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A 4.0-m-diameter playground merry-go-round, with a moment of inertia of
HACTEHA [7]

Answer:

7.1 ms⁻¹

Explanation:

d = diameter of merry-go-round = 4 m

r = radius of merry-go-round = \frac{d}{2} =  \frac{4}{2} = 2 m

I = moment of inertia = 500 kgm²

w_{i} = angular velocity of merry-go-round before ryan jumps = 2.0 rad/s

w_{f} = angular velocity of merry-go-round after ryan jumps = 0 rad/s

v = velocity of ryan before jumping onto the merry-go-round

m = mass of ryan = 70 kg

Using conservation of angular momentum

Iw_{i} - m v r = (I + mr^{2})w_{f}

(500)(2.0) - (70) v (2) = (I + mr^{2})(0)

1000 = 140 v

v = 7.1 ms⁻¹

5 0
2 years ago
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