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Slav-nsk [51]
4 years ago
13

A runner makes one lap around a 200 m track in a time of 25.0 s. What was the runner's average speed?

Physics
2 answers:
Evgen [1.6K]4 years ago
4 0
Please mark brainliest please

creativ13 [48]4 years ago
3 0
The answer is 8 meters per second 8m/s because 200 divided by 25 is 8 
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In this problem, you will calculate the location of the center of mass for the Earth-Moon system, and then you will calculate th
Radda [10]

Answer:

a) Option D is correct.

The center of mass between the Eartg and the moon is inside the Earth.

Explanation:

Given,

Mass of the moon = (7.35×10²²) kg

Mass of the Earth = (6.00×10²⁴) kg

Mass of the Sun = (2.00×10³⁰) kg

Distance between the Earth and the moon = (3.80×10⁵) km

Distance between the Earth and the Sun = (1.50×10⁸) km

With the assumption that all.of the bodies being considered are on the same straight line on the x-axis,

Note that Centre of mass is given as

C.M = (Σmx)/(Σm)

For the Earth-moon system, let the earth be x=0, then the moon is at x = (3.80 × 10 5) km away.

C.M = (Σmx)/(Σm)

Σmx = (6.00×10²⁴)) × (0) + (7.35×10²²) × (3.80×10⁵) = (2.793 × 10²⁸) kg.km

Σm = (6.00×10²⁴) + (7.35×10²²) = (6.0735 × 10²⁴) kg

CM = (2.793 × 10²⁸) ÷ (6.0735 × 10²⁴)

CM = (4.60 × 10³) km = 4600 km

This means the centre of mass is 4600 km from the Earth.

The Earth's radius = 6378 km

Hence, the centre if mass is inside the Earth.

Hope this Helps!!!

8 0
3 years ago
How can humans building a drainage system affect the water cycle?
nasty-shy [4]
Human building a drainage system could affect the water cycle because : 
C. water would be directed to a new location because of the drains

This could potentially changed the natural occurrence that usually happened within the water cycle

hope this helps


5 0
3 years ago
Read 2 more answers
When an electron de-excites from the third quantum level to the second, and then to the ground state, two photons are emitted. T
Leokris [45]

Answer:

ground state

Explanation:

  Lets take  

n=3 ,n=2 ,n=1 are the energy level.

Energy level n=1 is the ground energy level.

The energy from 3 to 1 = hν

The energy from 3 to 2 = hν₁

The energy from 2 to 1 = hν₂

We can say that

hν = hν₁ +  hν₂

If the electron were de-excitation from the third level to ground level then the sum of emitted frequency will be equal to the frequency of a single electron.

Therefore the answer is ground state.

3 0
3 years ago
18
zhannawk [14.2K]
Average speed= total distance/total time =12km/h
6 0
3 years ago
Describe a line that indicates moving backward on a graph
Vladimir [108]

Answer:

time speed accelaration negatives backwards

Explanation:

4 0
3 years ago
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