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Valentin [98]
2 years ago
12

A car traveling south is 200 kilometers from its starting point after 2 hours. What is the average velocity of the car?

Physics
1 answer:
Oksi-84 [34.3K]2 years ago
5 0

Explanation:

Total displacement = 200 km

Total time taken = 2 hour...

Now...

average \: velocity \:  =  \frac{total \: displacement}{total \: time \: taken \: }  \\

=  \frac{200}{2}  \\

= 100 kilometers/hour south

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A 73.9 kg weight-watcher wishes to climb a
Tresset [83]

The height to which the weight-watcher must climb to work off the equivalent 991 (food) Calories is 0.59 Km

<h3>How to determine the energy. </h3>

1 food calorie = 103 calories

Therefore,

991 food calories = 991 × 103

991 food calories = 102073 calories

Multiply by 4.2 to express in joule (J)

991 food calories = 102073 × 4.2

991 food calories = 428706.6 J

<h3>How to determine the height </h3>
  • Energy (E) = 428706.6 J
  • Mass (m) = 73.9 kg
  • Acceleration due to gravity (g) = 9.8 m/s²
  • Height (h) =?

E = mgh

Divide both side by mg

h = E / mg

h = 428706.6 / (73.9 × 9.8)

h = 591.95 m

Divide by 1000 to express in km

h = 591.95 / 1000

h = 0.59 Km

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brainly.com/question/10703928

7 0
2 years ago
Is platinum carbonate naturally occurring or human made?
skad [1K]

Answer:

no

Explanation:

Platinum is a noble metal. The concentrations of platinum in the soil, water and air are very minimal. ... Finally, a danger of platinum is that it can cause potentiation of the toxicity of other dangerous chemicals in the human body, such as selenium.

6 0
3 years ago
According to Kepler's Second Law the radius vector drawn from the Sun to a planet Multiple Choice is the same for all planets. s
Mademuasel [1]

Answer:

sweeps out equal areas in equal times.

Explanation:

As we know that there is no torque due to Sun on the planets revolving about the sun

so we will have

\tau_{net} = 0

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now we also know that

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\frac{dA}{dt} = \frac{L}{2m}

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all planets sweeps out equal areas in equal times.

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3 years ago
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Answer:

a

b

a

d

9

Explanation:

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