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melisa1 [442]
3 years ago
8

What is one benefit of lifelong physical activity?

Physics
1 answer:
kvasek [131]3 years ago
5 0
The answer would be C
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A spring with spring constant 15 N/m hangs from the ceiling. A ball is attached to the spring and allowed to come to rest. It is
Lana71 [14]

Answer:

a

   m  = 0.169 \ kg

b

  |v_{max} |=  0.5653 \ m/s

Explanation:

From the question we are told that

    The  spring constant is  k =  14 \ N/m

     The  maximum extension of the spring is  A =  6.0 \ cm  =  0.06 \ m

     The number of oscillation is  n  =  30

      The  time taken is  t  =  20 \ s

Generally the the angular speed of this oscillations is mathematically represented as

           w = \frac{2 \pi}{T}

where T is the period which is mathematically represented as

     T  =  \frac{t}{n}

substituting values

     T  =  \frac{20}{30 }

     T  = 0.667 \ s

Thus  

       w = \frac{2 * 3.142 }{ 0.667}

       w =  9.421 \ rad/s

this angular speed can also be represented mathematically as

       w =  \sqrt{\frac{k}{m} }

=>   m  =\frac{k }{w^2}

substituting values

      m  =\frac{ 15 }{(9.421)^2}

      m  = 0.169 \ kg

In SHM (simple harmonic motion )the equation for velocity is  mathematically represented as

        v =  - Awsin (wt)

The  velocity is maximum when  wt = \(90^o) \ or \ 1.5708\ rad

     v_{max} = -  A* w

=>   |v_{max} |=  A* w

=>    |v_{max} |=   0.06 * 9.421

=>   |v_{max} |=  0.5653 \ m/s

5 0
3 years ago
The Kapandu boys dormitory in the UPNG is going up in flames. Rachel, a former student of Physics, who
Tom [10]

Answer:

<em>1108.464 N of force</em>

Explanation:

diameter of water hose = 70 cm = 0.7 m

radius = 0.7/2 = 0.35 m

volumetric flow rate Q = 420 L/min

1 L = 0.001 m^3

1 min = 60 s

therefore,

Q = 420 L/min = (420 x 0.001)/60 = 0.007 m^3/s

Area A of fire hose = πr^{2} = 3.142 x 0.35^{2} = 0.38 m^2

<em>From continuity equation, Q = AV</em>

where V1 is the velocity of the water through the pipe, and A1 is the area of the pipe.

Q = A1V1

0.007 = 0.38V1

V1 = 0.007/0.38 = 0.018 m/s.

Nozzle diameter = 0.75 cm = 0.0075 m

radius = 0.00375

Area = πr^{2} = 3.142 x 0.00375^{2} = 4.42 x 10^{-5} m^2

velocity of water through the nozzle will be

V2 = Q/A2 = 0.007 ÷ (4.42 x 10^{-5}) = 158.37 m/s

From

<em>F = ρQ(v2 - v1)</em>

Where,

F = force exerted

p = density of water = 1000 kg/m^3

F = 1000 x 0.007 x (158.37 - 0.018) = <em>1108.464 N of force</em>

4 0
3 years ago
What is the English unit of volume
Luda [366]
The basic unit of volume is the liter although the cubic centimeter and milliliter are also widely used as units for measuring volume.


Brainlest answer is always appreciated ( ͡ ͜ʖ ͡ )
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Rzqust [24]

Answer:

B

Explanation:

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3 years ago
What makes centripetal force different from other forces
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The first one is faster than the other ! love you!!
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