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Rainbow [258]
3 years ago
9

Who was the first to state the concept of an atom?

Physics
2 answers:
LenaWriter [7]3 years ago
4 0
Democritus was the first to state the concept of an atom; he proposed that matter is made up of tiny, indivisible particles called atoms
Naddik [55]3 years ago
3 0

Answer:

Democritus

Explanation:

Greek philosophers Leucippus and Democritus first developed the concept of the atom in the 5th century BC

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What body systems are formed from specialized cells?
Phoenix [80]

Answer:

tissues

Explanation:

7 0
4 years ago
Help<br> What's the average speed of each of these???
zalisa [80]

Answer:

1) 1.15666

2)1.07

3)1.36

Explanation:

To find the average take the vaules of the numbers and add then divide by how many numbers are in the eqation and that should give you your average.

5 0
3 years ago
7. What causes waves to bend?
lesantik [10]

Answer:

Refraction

Explanation:

Refraction is the change in direction of waves that occurs when waves travel from one medium to another. Refraction is always accompanied by a wavelength and speed change. Diffraction is the bending of waves around obstacles and openings.

7 0
3 years ago
Read 2 more answers
How much ice (at 0°C) must be added to 1.90 kg of water at 79 °C so as to end up with all liquid at 8 °C? (ci = 2000 J/(kg.°
muminat

m = mass of the ice added = ?

M = mass of water = 1.90 kg

c_{w} = specific heat of the water = 4186 J/(kg ⁰C)

c_{i}  = specific heat of the ice = 2000 J/(kg ⁰C)

L_{f} = latent heat of fusion of ice to water = 3.35 x 10⁵ J/kg

T_{ii}  = initial temperature of ice = 0 ⁰C

T_{wi} = initial temperature of water = 79 ⁰C

T = final equilibrium temperature = 8 ⁰C

using conservation of heat

Heat gained by ice = Heat lost by water

m c_{w}  (T - T_{ii} ) + m L_{f}  = M c_{w}  (T_{wi} - T)

inserting the values

m (4186) (8 - 0) + m (3.35 x 10⁵ ) = (1.90) (4186) (79 - 8)

m = 1.53 kg

4 0
3 years ago
A furlong is 220 yd. A fortnight is 2 weeks. Convert a speed of one furlong per fortnight to millimeters per second.
nlexa [21]

Answer:

0.1663\frac{mm}{s}

Explanation:

You need to convert furlongs to yards to mm:

\frac{1 furlong}{1 fortnight}*\frac{220 yd}{1 furlong}*\frac{0.9144m}{1yd}*\frac{1000mm}{1m} = \frac{201168 mm}{1 fortnight}

Now, we convert fortnight to seconds:

\frac{201168 mm}{1 fortnight}*\frac{1 fortnight}{2 weeks}*\frac{1 week}{7 days} *\frac{1 day}{24 h}*\frac{1 h}{3600s}  = 0.1663\frac{mm}{s}

5 0
3 years ago
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