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pav-90 [236]
3 years ago
5

Solving quadratic equations by extracting square roots in p²-16=-16​

Physics
1 answer:
noname [10]3 years ago
8 0

Answer:

p=0

Explanation:

p^2 -16 = -16

p^2 = -16 +16

p = √0

p = 0

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Water flowing through a garden hose of diameter 2.76 cm fills a 20.0-L bucket in 1.45 min. (a) What is the speed of the water le
mafiozo [28]

Answer:

v = 31.84 cm/s or 0.318 m/s

the speed of the water leaving the end of the hose is 31.84 cm/s or 0.318 m/s

Explanation:

Given;

Diameter of hose d = 2.76 cm

Volume filled V = 20.0 L = 20,000 cm^3

Time t = 1.45 min = 105 seconds

The volumetric flow rate of water is;

F = V/t = 20,000cm^3 ÷ 105 seconds

F = 190.48 cm^3/s

The volumetric flow rate is equal the cross sectional area of pipe multiply by the speed of flow.

F = Av

v = F/A

Area A = πd^2/4

Speed v = F/(πd^2/4)

v = 4F/πd^2 ......1

Substituting the given values;

v = (4×190.48)/(π×2.76^2)

v = 31.83767439628 cm/s

v = 31.84 cm/s or 0.318 m/s

the speed of the water leaving the end of the hose is 31.84 cm/s or 0.318 m/s

3 0
3 years ago
A box is against a wall. A person pushes on the box, but the box does not move. Is this situation an example of a force
Leya [2.2K]

Answer: I don’t think so, because the box is ALREADY against the wall so you can’t move it further into the wall

Explanation:

7 0
3 years ago
Read 2 more answers
A boy takes 20 minutes to cover 3.2 km on a bicycle find the speed in km/hr​
Murrr4er [49]

Answer:

9.6 km/h

Explanation:

20 minutes=1/3 minute.

The speed of the bicycle: 3.2:1/3=9.6 km/h.

Answer: 9.6 km/h

4 0
3 years ago
A water-skier is moving at a speed of 12.0 m/s . When she skis in the same direction as a traveling wave, she springs upward eve
Kisachek [45]

Answer:

Mechanical waves require a medium to transfer their energy.

What are examples of mechanical waves?

Explanation:

Mechanical waves require a medium to transfer their energy.

What are examples of mechanical waves?

7 0
3 years ago
a student stands several meters in front of a smooth reflecting wall, holding a board on which a wire is fixed at each end. the
Andrew [12]

Answer:

Explanation:

From the question we are told that

      The length of the wire is  L  = 75.0cm = \frac{75}{100}  =  0.75 \  m

      The mass of the wire is  m  =  2.25 \  g  =  \frac{2.25}{1000} = 0.00225 \ kg

      The tension is  T  = 400 \ N        

       The frequency of the beat heard by the second student is

  f_b =  8.30\  beat/second

The speed of the wave generated by the vibration of the wire is mathematically represented as

           v  = \sqrt{\frac{TL}{m}}

substituting values

           v  = \sqrt{\frac{400 *0.75}{0.00225}}

          v  =  365.15 m/s

         The wire is vibrating in its third harmonics so the wavelength is  

                        \lambda  =  \frac{2L}{3}

substituting values

                        \lambda  =  \frac{2*0.75}{3}

                        \lambda  =  0.5 \ m

The frequency of this vibration is mathematically represented as  

              f =  \frac{v}{\lambda }

substituting values  

           f =  \frac{365.15}{0.5 }

          f =  730.3 Hz

The speed of the second student (Observer) is mathematically represented as

           v_o  =  [\frac{f_b}{2f} ] * v

substituting values    

         v_o  =  [\frac{8.30}{2* 730.3} ] * 365.15

        v_o  = 2.08 \ m/s

8 0
3 years ago
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