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hoa [83]
3 years ago
10

Which is the smallest atom? A. Magnesium (Mg) B. Calcium (Ca) C. Barium (Ba) D. Strontium (Sr)

Physics
1 answer:
padilas [110]3 years ago
6 0

Try option B or option A

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In the desert air, sound travels at 358 meters per second (m/s). In the polar air, sound travels at 330 meters per
Sati [7]

Answer:

The correct option is;

C. The temperature of the air affects the speed of sound

Explanation:

The information given are;

The speed with which sound travels in the desert air = 358 m/s

The speed with which sound travels in the polar air = 330 m/s

The major difference between the desert air and the polar air is that the temperature of the desert air is hotter than the temperature of the air in the polar region. Therefore the speed of sound is affected by the air temperature.

The equation that gives the relationship of the speed of sound in air, v_{air}, to temperature is presented as follows;

v_{air} = 331\frac{m}{s} \times \sqrt{\dfrac{T_K}{273 K} } =  331\frac{m}{s} \times \sqrt{1 + \dfrac{T_{^{\circ}C}}{273 ^{\circ} C} }

Which shows that the speed of sound in air, v_{air}, rises as the temperature of the air rises.

Where;

T_{^{\circ}C} = The temperature of the air in degrees Celsius

T_K = The temperature of the air in degrees Kelvin.

7 0
4 years ago
Which part of the female reproductive system produces ova?
vovangra [49]
A would be the best answer beacuse
Ovaries - small, oval-shaped glands that are located on either side of the uterus. The ovaries produce eggs (ova - an ovum is one egg, ova means multiple eggs.) The ovaries also produce the main female sex hormones which are released into the bloodstream.
5 0
3 years ago
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The gravitational pull between Pluto and the sun would be increased if
Troyanec [42]

Answer:

pluto was closer

Explanation:

6 0
3 years ago
Mohs scale is used in describing which characteristic?
AleksandrR [38]
Mohs scale of mineral hardness is a qualitative scale that characterizes the scratch resistance of various minerals with the ablity of harder material to scratch softer material
7 0
3 years ago
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A U-shaped tube open to the air at both ends contains water. A quantity of oil of unknown density is slowly poured into the righ
nadezda [96]

Answer:

\rho_o=600\ kg.m^{-3} is the density of the oil

Explanation:

Given:

  • height of oil column, h_o=20\ cm
  • oil column height that is more than the water column height in the other arm, \delta h=8\ cm

<u>Now from the given it is clear that the height of water column is:</u>

h_w=h_o-\delta h

h_w=20-8

h_w=12\ cm

Now according to the pressure balance condition of fluid columns:

Pressure due to water column = Pressure due to oil column

P_w=P_o

\rho_w.g.h_w=\rho_o.g.h_o

1000\times 9.8\times 0.12=\rho_o\times 9.8\times 0.2

\rho_o=600\ kg.m^{-3} is the density of the oil

8 0
4 years ago
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