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Doss [256]
3 years ago
15

How many discovered planets are there

Physics
1 answer:
Allisa [31]3 years ago
5 0
We have discovered 786 planets. Most of which were only recently discovered.
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Light of different colors is emitted from different stars because :.
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Different temperatures

Explanation:

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Sodium Hydroxide is highly Basic
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When looking at human motives the following theorist developed a hierarchy of five needs that range from basic physiological nee
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A circuit has a 10 Ω resistor connected to a 1.5 V dry cell. What is the current that can flow in the circuit?
ludmilkaskok [199]

Here is the highly detailed, arcane, complex, technical form of Ohm's Law that is needed in order to answer this question  ===>  I = V / R  .

Current = (voltage) / (resistance)

Current = (1.5 V) / (10 Ω)

<em>Current = 0.15 Ampere</em>

8 0
3 years ago
Ilya and Anya each can run at a speed of 7.30 mph and walk at a speed of 4.00 mph. They set off together on a route of length 5.
katrin [286]

Answer:

a)0.9675 h

b)5.168 mph

c)0.885 h

d)5.65 mph

Explanation:

The distance travelled by a moving object can be calculated as the velocity multiplied by the time, for this problem we can divide the problem in two stages, one where the are walking and another where they run,

Considering the total time for Anya is t_{a}:

She first walks for half the distance (2.5 miles) so:

2.5 miles=V_{w}*t_{a1}

Solving for t_{a1}:

t_{a1}=\frac{2.5miles}{V_{w}}=\frac{2.5miles}{4 mph}=0.625 h

Then she runs the other half of the distance:

2.5 miles=V_{r}*t_{a2}

t_{a2}=\frac{2.5miles}{V_{r}}=\frac{2.5miles}{7.3 mph}=0.3425 h

Adding this two durations we have the total time it takes for Anya to cover the distance:

t_{a}=0.3425 h+0.625 h=0.9675 h

The average velocity can be calculated as the total distance divided by the total time:

V_{a-av} =\frac{5 miles}{0.9675 h} =5.168 mph

Considering the total time for Ilya is t_{I}:

She first walks for half the time so:

d_{I1}=V_{w}*t_{I}/2

Where V_{w} is the velocity when walking (same for both people). On the second half she runs:

d_{I2}=V_{r}*t_{I}/2

This two distances must sum the total distance 5 miles, so:

d_{I2}+d_{I2}=5 miles

replacing the expressions above:

V_{w}*t_{I}/2+V_{r}*t_{I}/2=(V_{w}+V_{r})*t_{I}/2=5 miles

t_{I}=\frac{5miles*2}{V_{w}+V_{r}}=\frac{10 miles}{4mph+7.3mph}=0.885 h

so it takes Ilya 0.885 hours to to cover the distance

The average velocity can be calculated as the total distance divided by the total time:

V_{I-av} =\frac{5 miles}{0.885 h} =5.65 mph

3 0
3 years ago
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