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bonufazy [111]
3 years ago
11

a girl performed 50j of work lifting a heavy box it took her 5 seconds to lift the box what is her power

Physics
1 answer:
son4ous [18]3 years ago
3 0

Answer:

10 W

Explanation:

Power is work over time.

P = W / t

P = 50 J / 5 s

P = 10 W

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Explain how water circulates from deep oceans to the surface.
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Need help best answer will get brainiest
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Answer:

1) A trait is a specific feature or characteristic, typically genetic.

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Underground water is being pumped into a pool whose cross section is 3 m x 4 m while water is discharged through a 0.076m-diamet
Svetllana [295]
Given:

Area of pool = 3m×4m
Diameter of orifice = 0.076m
Outlet Velocity = 6.3m/s
Accumulation velocity = 1.5cm/min

Required:

Inlet flowrate

Solution:

The problem can be solved by this general formula.

Accumulation = Inlet flowrate - Outlet flowrate
Accumulation velocity × Area of pool = Inlet flowrate - Outlet velocity × Area of orifice

First, we need to convert the units of the accumulation velocity into m/s to be consistent.

Accumulation velocity = 1.5cm/min × (1min/60s)×(1m/100cm)
Accumulation velocity = 0.00025 m/s

We then calculate the area of the pool and the area of the orifice by:

Area of pool = 3 × 4 m²
Area of pool = 12m²

Area of orifice = πd²/4 = π(0.076m)²/4
Area of orifice = 0.00454m²

Since we have all we need, we plug in the values to the general equation earlier

Accumulation velocity × Area of pool = Inlet flowrate - Outlet velocity × Area of orifice

0.00025 m/s × 12m² = Inlet flowrate - 6.3m/s × 0.00454m²

Transposing terms,

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6 0
3 years ago
A long solenoid that has 1000 turns uniformly distributed over a length of 0.400 m produces a magnetic field of magnitude 1.00 ×
yKpoI14uk [10]

0.03185A current is required in the windings for that to occur.

  • Solenoids are essentially coils of cord. These generate a magnetic subject which strives a pressure over a steel element.A solenoid is a fundamental time period for a coil of cord that we use as an electromagnet.
  • We additionally consult with the tool which could convert electric power into mechanical power as a solenoid.
  • Actually it generates a magnetic subject for developing linear movement from the electrical cutting-edge. With using a magnetic subject.
  • Magnetic field at the centre of a solenoid of length 'L' having 'N' number of turns with a current 'I' is given by B=\frac{u_0NI}{L}   ...(1)

It is given that 1000 turns uniformly distributed over a length of 0.400 m produces a magnetic field of magnitude 1.00 ×10⁻⁴T .

Putting above values in equation (1) , we get

1.00\times10^{-4}=\frac{4\pi \times10^{-7}\times1000I}{0.400} \\\\I=\frac{1.00\times10^{-4} \times0.400}{4\pi \times1000} \\\\I=0.03185A

Learn about solenoid more here :

brainly.com/question/15218721

#SPJ4

7 0
2 years ago
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