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kaheart [24]
2 years ago
13

How can you find the net force if two forces act in opposite directions?

Physics
1 answer:
Tresset [83]2 years ago
4 0

Then the magnitude of the net force is the difference between the two forces,
and its direction is the same as the direction of the greater one.


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Calculate the power transfer when a pump moves 50kg of water through a vertical height of 8meters in 5seconds (take g =10meters
Vika [28.1K]

Hi there!

Recall the following relationships:

W = \Delta U = mg\Delta h\\\\P = \frac{W}{t}

W = Work (J)

U = Potential Energy (J)

m = mass (kg)

g = acceleration due to gravity (9.8 m/s²)

h = height (m)

t = time (s)

Begin by calculating the work:

W = 50(10)(8) = 4000 J

Now, divide by the time to solve for power:

P = \frac{4000}{5} = \boxed{800W}

**W is the unit for power (Watts).  Be careful not to get the two confused.

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What pressure will be exerted by a 20 N box that has equal sides of 1 meter
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A student makes a short electromagnet by winding 580 turns of wire around a wooden cylinder of diameter d = 2.1 cm. The coil is
Mashutka [201]

Answer:

1.02453 Am²

0.36834 m

Explanation:

N = Number of turns = 580

d = Diameter = 2.1 cm

r = Radius = \frac{d}{2}=1.05\ cm

A = Area = \pi r^2

I = Current = 5.1 A

B = Magnetic field = 4.1 μT

x = Distance

\mu_0 = Vacuum permeability = 4\pi \times 10^{-7}\ H/m

Magnetic dipole moment is given by

\mu=NIA\\\Rightarrow \mu=580\times 5.1\times \pi\times 0.0105^2\\\Rightarrow \mu=1.02453\ Am^2

The magnitude of the magnetic dipole moment of this device is 1.02453 Am²

Magnetic field is given by

B=\frac{\mu_0NIA}{2\pi x^3}\\\Rightarrow x=\left(\frac{\mu_0NIA}{2\pi B}\right)^{\frac{1}{3}}\\\Rightarrow x=\left(\frac{4\pi\times 10^{-7}\times 580\times 5.1\times \pi\times 0.0105^2}{2\pi 4.1\times 10^{-6}}\right)^{\frac{1}{3}}\\\Rightarrow x=0.36834\ m

The axial distance is 0.36834 m

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3 years ago
On July 8th, I will be 8.51472x10 8 seconds old. How old will I be in years?
Lerok [7]

Answer:

almost 27 years 26.98

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Pedro is building a model motor. He would like the motor to be more powerful. Which of the following would best help him increas
Ratling [72]

The answer is B because that that will make it more powerful but less lasting.

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