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4 years ago

In which of the following situations would the least work have been done?

1 answer:

3 0

<span>
Work = (magnitude of the force) x (distance in the direction of the force)

A 100-N force lifts an object 3 m. ==> (100 x 3) = 300 joules

B. A 250-N force moves an object 1 m. ==> (250 x 1) = 250 joules

C. A 25-N force moves an object 8 m. ==> (25 x 8) = 200 joules

D. A 600-N force is applied to an object
and moves it 0 m. ==> (600 x 0) = no work
</span> Winner ! Least work.

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The total energy need during pregnancy is normally distributed, with mean Mu = 2600 kcal/day and standard deviation = 50 kcal/da

Digiron [165]

This is a normal distribution and we can use the standard score to compute for probabilities. We compute the standard score of the given.

z = (x - mu)/sd
z = (2625 - 2600)/50 = 25/50 = 0.5.

Consulting the z-table, P(z <= 0.5) = 0.6915.
P(z > 0.5) = 1 - P(z <= 0.5) = 1 - 0.6915 = 0.3085.

I hope my answer has come to your help. Thank you for posting your question here in Brainly. We hope to answer more of your questions and inquiries soon. Have a nice day ahead!

7 0

4 years ago

Joseph DeLoach of the United States set an Olympic record in 1988 for the 200-meter dash with a time of 19.75 seconds. What was

Lera25 [3.4K]

Answer:

The average speed was 10.12 m/s or 22.96 mi/h

Explanation:

The average speed is defined as:

$v = \frac{d}{t}$ (1)

Where d is the total distance traveled and t is the passed time.

For the special case of Joseph DeLoach, he traveled a total distance of 200 meters in 19.75 seconds. Those values can be introduced in equation 1:

$v = \frac{200 m}{19.75 s}$

$v = 10.12 m/s$

That means that Joseph DeLoach traveled a distance of 10.12 meters per second.

To represent the result in miles per hour, it is necessary to know that 1 mile is equivalent to 1609 meters.

$200 m x \frac{1 mi}{1609 m}$ ⇒ 0.124 mi

it is needed to express the given time in units of hour. 1 hour is equivalent to 3600 seconds.

$19.75 s x \frac{1 h}{3600 s}$ ⇒ 0.0054 h

Then, equation 1 is used with the new representation of the values.

$v = \frac{0.124 mi}{0.0054 h}$

$v = 22.96 mi/h$

7 0

3 years ago

Lightning occurs when there is a flow of electric charge (principally electrons) between the ground and a thundercloud. assume t

damaskus [11]

Given:
The rate of charge flow in the lightning bolt is 24000 C/s = 24×10³ C/s.
Duration of charge flow = 105 μs = 105×10⁻⁶ s

By definition, the current flow is
I = (24×10³)/(105×10⁻⁶) = 2.286×10⁸ A = 228.6 MA (mega amps)

Answer: 228.6 MA

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4 years ago

4. What is an example of water condensing?

adelina 88 [10]

The answer is d.
Explanation: dew is a form of condensation

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3 years ago

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3 years ago