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algol [13]
3 years ago
10

The manufacturer of a 1.5 V D flashlight battery says that the battery will deliver 9 {\rm mA} for 37 continuous hours. During t

hat time the voltage will drop from 1.5 {\rm V} to 1.0 {\rm V} . Assume the drop in voltage is linear with time.Part A How much energy does the battery deliver in this 37h interval?Express your answer to two significant figures and include the appropriate units.
Engineering
1 answer:
borishaifa [10]3 years ago
7 0

Answer:

1.42 KJ

Explanation:

solution:

power in beginning p_{0}=(1.5 V).(9×10^{-3} A)

                                    = 13.5 mW

after continuous 37 hours it drops to

                                    p_{37}=(1 V).(9×10^{-3} A)

                                         =9 mW

When the voltage will drop energy will not remain the same but the voltage drop will always remain same if the voltage was drop to for example from 5 V to 4.5 V the drop will remain the same.

                  37 hours= 37.60.60

                                 =133200‬ s

                              w=(9×10^{-3} A×133200‬ )+\frac{1}{2}(13.5.10^{-3}-9.10^{-3})(133200)

                                 =1.42 KJ

<em>NOTE:</em>

There maybe a calculation error but the method is correct.

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8 0
2 years ago
In the construction of a large reactor pressure vessel, a new steel alloy with a plane strain fracture toughness of 55 MPa-m1/2
sp2606 [1]

Answer:

l=24mm

Explanation:

From the question we are told that:

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Y value Y=1.0

Stress level of\sigma =200 MPa

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in mm

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6 0
3 years ago
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Answer:

0.5°c

Explanation:

Humidity ratio by mass can be expressed as

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Humidity ratio expressed by mass:

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6 0
3 years ago
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Answer:

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Explanation:

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