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SSSSS [86.1K]
3 years ago
14

Using the rules for significant figures, what do you get when you multiply 67.6 by 1.2?

Physics
2 answers:
Natali [406]3 years ago
5 0

Answer:

B. 81

Explanation:

Answer: = 81  (real number)

Answer:= 8.1 × 101   ( In scientific notation)

Answer:= 8.1e1  (scientific e notation)

Rule: All the number before the power of 10 are considered as significant figures.

number of significant figures: 2

Paul [167]3 years ago
3 0

Answer:

B. 81

Explanation:

When you multiply two numbers, round the answer to the least number of significant figures available.  67.6 has three significant figures, and 1.2 has two significant figures.  So we round to two significant figures.

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jasenka [17]

Answer:

The answer to the question is

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Explanation:

To solve the question, we note that

the height of fall = 490 ft = ‪149.352‬ m

Time to touch the ground = 7 seconds

We are required to find out how far the object falls in the first 5 seconds

We apply the relation

S = u·t + 0.5×g·t ² = We then have

‪149.352‬ = U×7+0.5*9.81*49 From where u = -13 m/s

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3 years ago
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bulgar [2K]

Answer:

v = 15.65 m/s

Explanation:

We use conservation of mechanical energy between initial (i) and final (f) states:

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At the top of the cave at the instant the bat starts to fall, there is only potential energy since the bat's velocity is zero.

Pi = m g h = 600 J

and the KEi = 0 J (no velocity)

Knowing the height of the cave's roof (12.8 m) , we can find the mass of the bat:

m = 600 J / (g 12.5) = 4.9 kg

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Pf + KEf = 600 J

with Pf = 0 (just touching the ground)

KEf= 1/2  4.9 (v^2)

and we solve for the velocity:

600 J = 0 + 1/2  4.9 (v^2)

v^2 = 600 * 2 / 4.9 = 244.9

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2 years ago
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3 years ago
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3 years ago
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