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Salsk061 [2.6K]
4 years ago
9

If dot C moves to position 5 (60 meters), what is its average velocity during these 5 seconds? A) 10 m/s B) 11 m/s C) 12 m/s D)

13 m/s
Physics
2 answers:
BartSMP [9]4 years ago
8 0

Answer:

C) 12 m/s

Explanation:

As we know that average velocity is given as ratio of displacement and time

so here we can say

v_{avg} = \frac{displacement}{time}

now we have

displacement = 60 meter

time = 5 seconds

now as per above formula we have

v_{avg} = \frac{60}{5}

v_{avg} = 12 m/s

so the average velocity must be 12 m/s

nlexa [21]4 years ago
6 0
C) 12 m/s because 60 m ÷ by 5sec equals 12m/s
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initial velocity=0m/s
time=.28s

We have to find final velocity.

The equation we use is

Final velocity=initial velocity+acceleration x time

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Vf=2.7468m/s

We would round this to:

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3 years ago
The total amount of water on earth_____. Remains the same. Is decreasing Is increasing
Elena L [17]

The total amount of water on earth <u>remains the same</u>.

<u>Option: A</u>

<u>Explanation:</u>

The quantity of water on Earth remains the same now as it was in the Olden days. All water which is consumed by living things continue to be as part of the Earth's total water content.

The total amount is not exactly constant, as there are two fluxes of water between Earth and the rest of the solar system. There is a steady rain of water-bearing meteoroids hitting the planet, which slowly increases the amount of water. At the same time, molecules of water often dissociate in the upper atmosphere into hydrogen and oxygen due to ultraviolet light from the sun. Some of the hydrogen atoms have enough energy to escape from Earth’s gravitational field, and so are lost. This slowly decreases the amount of water. In addition, tectonic plate subduction is constantly carrying water down into Earth’s mantle, and volcanoes are constantly spewing water out onto the surface again. The balance between the two processes can change considerably over time. But all of these actions are meager  compared to the total quantity of water on our planet, and two of them are in the opposite direction of the other two. So the overall change is insignificant, even when considered over long spans of geologic time.

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3 years ago
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A person running at 5 mph puts on a burst of speed to finish a race at 7 mph. What is the velocity
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Compare the advantages and disadvantages of buying compact fluorescent bulbs rather than filament bulbs (6 marks)
myrzilka [38]
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Suppose the moon were held in its orbit not by gravity but by a massless cable attached to the center of the earth. What would b
Mars2501 [29]

Answer:

1.98\cdot 10^{20} N

Explanation:

The tension in the cable would be then equal to the gravitational force that keeps the Moon in circular orbit around the Earth. So, we just need to calculate the magnitude of this force, which is given by:

F=G\frac{mM}{r^2}

where:

G=6.67\cdot 10^{-11} m^3 kg^{-1} s^{-2} is the gravitational constant

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r=3.84\cdot 10^8 m is the distance between the Earth and the Moon

Substituting these numbers into the formula, we find:

F=(6.67\cdot 10^{-11} ) \frac{(7.35 \cdot 10^{22})(5.97\cdot 10^{24})}{(3.84\cdot 10^8)^2}=1.98\cdot 10^{20} N

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3 years ago
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