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Anni [7]
3 years ago
15

PHYSICS

Physics
1 answer:
quester [9]3 years ago
7 0

Answer:

c) 8.3 x 10^24 molecules

Explanation:

First of all, we convert the volume of the glass of water from mL to cm^3:

V=250 mL = 250 cm^3

The relationship between mass and volume is:

d=\frac{M}{V}

where

d=1.00 g/cm^3 is the density of water

M is the total mass of the glass of water

V=250 cm^3 is the volume of the water in the glass

Solving for M,

M=dV=(1.00)(250)=250 g = 0.250 kg

Now we know that the mass of a single molecule of water is

m=3.0\cdot 10^{-26}kg

The total mass of the water in the glass can be written as

M=Nm

where

N is the number of molecules in the glass of water

Solving for N, we find:

N=\frac{M}{m}=\frac{0.250}{3.0\cdot 10^{-26}}=8.3\cdot 10^{24}

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Answer : The frequency decreases by a factor of 2.

Explanation :

Given that the wave travels at a constant speed. The speed of the wave is given as :

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In this case, the speed is constant. So, the relation between the frequency and the wavelength is inverse.

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If the wavelength increases by a factor of 2, its frequency will decrease by a factor of 2.

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3 0
3 years ago
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Calculate the speed of a car that travels 355km in 15 hours , a good answer please
Ludmilka [50]

Answer:

23.67 km / hr

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Drupady [299]

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Explanation:

Given parameters:

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Solution:

Average speed is the rate of change of total distance with total time taken.

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convert units to meters and seconds

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Distance to school  = 14.4 x 1000 = 14400m

Time taken by Amy = 49 x 60 = 2940s

Time taken by Bill = 69 x 60 = 4140s

Average speed of Amy = \frac{14400}{2940}  = 4.9m/s

Average speed of Bill = \frac{4140}{2940}  = 1.4m/s

Differences in speed = 4.9 - 1.5 = 3.4m/s

Amy was 3.4m/s faster than Bill

learn more:

Average speed brainly.com/question/8893949

#learnwithBrainly

5 0
3 years ago
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Afina-wow [57]

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The answer is D the rising of warm air pushing down cool air.

5 0
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ELEN [110]

Answer:

20m

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P.E=mgh

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