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Komok [63]
3 years ago
10

Why is it difficult to cut using a pair if of scissors with blunt blades

Physics
1 answer:
zlopas [31]3 years ago
8 0
Its not sharp enough to cut through whatever your trying to cut. Imagine trying to cut paper with your index finger and your middle finger. Doesn't work does it?
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Which two statements describe how ultrasound technology produces an image of a baby before it is born?
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Answer:a and c

Explanation:

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3 years ago
The change in internal energy during one complete cycle of a heat engine A. equals the net heat flow into the engine. B. equals
Stels [109]

Answer:

B. equals zero

Explanation:

Given data

one complete cycle = heat flow

solution

we have given that when heat engine complete 1 cycle change in energy = net heat flow

that is always equal to zero

from first law of thermodynamics that

ΔU = Q + W

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therefore change of internal energy during one cycle

ΔU = Ufinal -  Uinitial

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7 0
3 years ago
Is v2 = v1t+a dimensionally correct? Explain please!
Lady bird [3.3K]
You want v2 = v1 + at
v is measured in m/s, a in m/s2, and t in s.
the dimensions multiply like algebraic quantities. 
so because v2 is measured in m/s, then (v1 + at) has to come out in m/s
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time "s" cancels out one acceleration "s", so it comes ut to (m/s) + (m/s), which = (m/s). 
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4 0
3 years ago
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