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miskamm [114]
3 years ago
12

PLEASEEEEE HELPPPPP If a train traveled at 50 meters within 120 seconds, what is its speed?

Mathematics
1 answer:
Semenov [28]3 years ago
8 0

Answer:

2.4 miles per second

Step-by-step explanation:

50 meters / 120 seconds = 2.4 mps

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Select the correct answer. Which expression represents the series ? 1+5+25+125+625? creating and solving formulas for geometric
Art [367]

Answer:

The given series can be written as

4

∑  (5)^i

i = 0

We know that the series  is

1+5+25+125+625

This is equal to

(5)^0 + (5)^1 + (5)^2 + (5)^3 + (5)^4

Thus,

For i from 0 to 4,

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3 0
3 years ago
I need to know how to determine the product of the fractions and simplify
FinnZ [79.3K]
1      3     1×3       3
--- × --- = ------ = ----
2      4      2×4      8

5       5       5×5         25
--- × ---- = --------- = -------
6       7       6×7         42

hope is understandably 

5 0
3 years ago
Newton's law of cooling states that the temperature of an object changes at a rate proportional to the difference between its te
Aleonysh [2.5K]

Answer:

t=5.18 minute

Step-by-step explanation:

Using Newton's law of cooling

\frac{dT}{dt}=-k(T-T_{s})

T is temperature of a cup of coffee at any time t T_{s}, is the temperature of the surrounding and k is a constant of proportionality in this negative because temperature is decreasing.

T(0)=190\\T(1)=170\\T_{s}=66

\frac{dT}{dt}=-k(T-T_{s})\\\frac{dT}{(T-T_{s})}=-k*dt\\\int\limits {\frac{1}{T-T_{s} } } \, dT=-\int\limits {k} \, dt\\ln(T-T_{s})=k*t+C\\e*ln(T-T_{s})=e^{k*t+C} \\T-T_{s}=e^{k*t}*e^{C}\\e^{C}=C\\T-T_{s}=e^{k*t}*C\\T=T_{s}+e^{k*t}*C

To find constant knowing the time and the temperature the first step of the change of energy in cup of coffee

T=T_{s} +e^{-k*t}*C\\ C=190-66=124\\170=66+124*e^{-k*2}\\ 170-66=124*e^{-k*2}\\ln(\frac{104}{124})=ln*e^{-k*2}\\-0.175=-k*2\\k=0.08794

Now using the constant of decreasing can find the time to be a 145 temperature the cup of coffee

145=66+124*e^{-k*t} \\145-66=124*^{-0.087*t}

ln(0.637)=ln*e(-0.087*t)\\-0.45=-0.087*t\\t=5.18minutes

4 0
3 years ago
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dimaraw [331]

Answer:

a?

Step-by-step explanation:

8 0
3 years ago
dibuja un triangulo de catos de 15cm, 8cm. al unir sus puntos medios resulta un triangulo semejante a este
marshall27 [118]

Answer:

Step-by-step explanation:

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3 years ago
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