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aivan3 [116]
3 years ago
5

•What power does a pump develop to lift 35 L of water per minute

Physics
1 answer:
guajiro [1.7K]3 years ago
8 0

Answer:

p =  \frac{w}{t}  \\ p =  \frac{f \times d}{t}  \\ p =  \frac{m \times g \times d}{t}  \\ p =   \frac{35 \times 9.8 \times 110}{60.0}  \\ p = 629w

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The sound from a loud speaker has an intensity level of 80 db at a distance of 2.0m. Consider the speaker to be a point source,
Tamiku [17]

Answer:

2.83m

Explanation:

The information that we have is

Intensity at 2.0 m: I=80dB and r_{1}=2m

we need an intensity level of: I_{2}=40dB

thus, we are looking for the distance r_{2}.

which we can find with the law for intensity and distance:

(\frac{r_{2}}{r_{1}} )^2=\frac{I_{1}}{I_{2}}

we solve for r_{2}:

\frac{r_{2}}{r_{1}}=\sqrt{\frac{I_{1}}{I_{2}} }\\\\r_{2}=r_{1}\sqrt{\frac{I_{1}}{I_{2}} }

and we substitute the known values:

r_{2}=(2m)\sqrt{\frac{80dB}{40dB} }\\\\r_{2}=(2m)\sqrt{2}\\ r_{2}=2.83m

at a distance of 2.83m the intensity level is 40dB

5 0
3 years ago
in pea plants smooth seeds are dominant (S) and wrinkled seeds are reccessive(s). In a cross between two heterozygous plants, wh
Phantasy [73]
25% SS, 50% Ss, 25% ss, or 75% smooth, 25% wrinkled
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3 years ago
Which term describes a model in which a charge takes up no space and acts uniformly on its surroundings?
Serggg [28]
The term Point Charge describes a model in which a charge takes up no space and acts uniformly on its surroundings. A Point Charge also creates lines that are uniform in nature and can go both outwards or inwards. When it goes outwards, it shows a positive charge and when it goes inwards then it shows a negative charge.
4 0
3 years ago
Read 2 more answers
A quantity of 30.1 cm^3 of water at 22.4°C is placed in a freezer compartment and allowed to freeze to solid ice at -7.2°C. How
iogann1982 [59]

Answer:

13330.86 J

Explanation:

mass of volume of 30.1 cc of water = density x volume

= 1 x 30.1 = 30.1 gm

= 30.1 x 10⁻³ kg

Heat to be withdrawn to cool water from 22.4 degree to 0 degree

= mass x specific heat x fall of temperature

= 30.1 x 10⁻³ x 4186 x 22.4

= 2822.36 J

Heat to be withdrawn to cool water  0 degree ice

mass x latent heat of freezing

30.1 x 10⁻³ x 334000

= 10053.4 J

Heat to be withdrawn to cool ice from 0 degree to -7.2 degree

mass x specific heat of ice x fall of temperature

= 30.1 x 10⁻³ x 2100 x 7.2

= 455.1 J

Total heat to be withdrawn

=  2822.36  + 10053.4 + 455.1

= 13330.86 J

6 0
3 years ago
Describe the location of nonmetals on the periodic table
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Non metals are located to the far right of the periodic table. They are in the right side because they have high ionization energies and high electron affinities making them gain electrons easily.
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