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77julia77 [94]
3 years ago
6

Which of the following elements is a metalloid?

Physics
1 answer:
Pavlova-9 [17]3 years ago
6 0

Answer:

Germanium

Explanation:

Germanium is a chemical element that is grayish white metalliod

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B) The velocity of a car reduced from 50 km/h to 35 km/h over one minute
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Answer:

The car will travel 30 miles during the 30-minutes period of acceleration.

Explanation:

Given data :

Initial velocity = v₁ = 50 miles/hour

Final velocity = v₂ = 70 miles/hour

Time = t = 30 min = 0.5 hour

Using the definition of acceleration, we find the acceleration (a)

                   a = (v₂ - v₁) ÷ t

                   a = (70 - 50) ÷ 0.5

                   a = 20 ÷ 0.5

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Using 3rd equation of motion, we find the distance travel (s)

                    2as = v₂² -  v₁²

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                    80 × s = 4900 - 2500

                         s = 2400 ÷ 80

                        s = 30 miles  

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3 years ago
If a calorie is equivalent to 4.184 joules how many joules are contained in 250 kg calories slice of pizza
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In order to answer this, we will set up a simple ratio as such:

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Cross multiplying the second and third equations, we get:

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