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jasenka [17]
3 years ago
6

If the diameter of the black marble is 3.0 cm, and by using the formula for volume, what is a good approximation of its volume?

Record to the ones place.
Physics
1 answer:
Novay_Z [31]3 years ago
6 0

Answer: 14 centimeters cubed

Explanation:

Using the equation V=4/3*3.14*radius cubed

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A reversible reaction is in
natita [175]

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Equilibrium

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6 0
2 years ago
a water heater has a power rating of 1 kW. how many seconds will this heater take to boil 1 liter of water?
Tanzania [10]
Answer:
4.65 minutes.

Explanation:
Theoretical Assumptions (not realistic): 1) ALL of the heat energy is transferred to the water, and 2)the water is uniformly heated. 3) The water density is 1.0g/mL.
Because we are only heating it TO the “boiling point”, ONLY the energy to heat the water from 20 to 100’C using the heat capacity or specific heat of water is required. A “Watt” is 1 Joule/second. The specific heat of water is 4.184 J/g-’C. Water mass is 1000g. The energy required to heat it is therefore
1000
g
⋅
4.184
(
J
g
’
C
)
⋅
(
100
−
20
)
’
C
=
334720
J

The heater supplies 1200 J/s, so the time to provide this heat to the water is
334720
J
1200
(
J
s
)
=
278.9
s
or 4.65 minutes.
5 0
3 years ago
When were Earth’s landmasses first recognizable as the continents we know today
Nutka1998 [239]

Answer:

About 175 million years ago.

Explanation:

Approximately 335 million years ago , the scattered landforms on the earth surface assembled to form super-continents also called Pangea . It existed during late Paleozoic and Mesojoic era .It again started breaking away about 175 million years ago to form the present continents. Much of the Pangea was in the southern hemisphere surrounded by super-ocean.

6 1
3 years ago
Read 2 more answers
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