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Gwar [14]
3 years ago
15

How much electrical energy is used by a 75 W laptop that is operating 12 minutes?

Physics
1 answer:
LiRa [457]3 years ago
4 0
75 watts means 75 joules per second. 12 minutes is (12 x 60) = 720 seconds. 75 j/sec x 720sec = 54,000 joules.
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3 years ago
The tension of a guitar string is increased by 40%. By what factor odes the fundamental frequency of vibration change? a. 1.13 b
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Answer:

<h3> b. 1.18</h3>

Explanation:

The fundamental frequency in string is expressed as;

F1 = 1/2L√T/m .... 1

L is the length of the string

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m is the mass per unit length

If the tension is increased by 40%, the new tension will be;

T2 = T + 40%T

T2 = T + 0.4T

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The new fundamental frequency will be;

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F2/F = (1/2L√1.4T/m)/1/2L√T/m)+

F2/F = √1.4T/m ÷ √T/m

F2/F = √1.4T/√m ×√m/√T

F2/F = √1.4T/√T

F2/F = 1.18√T/√T

F2/F = 1.18

F2 = 1.18F

Hence the fundamental frequency of vibration changes by a factor of 1.18

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3 years ago
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