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2 years ago

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

1 answer:

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.

4 0

2 years ago

What pressure will be exerted by a 20 N box that has equal sides of 1 meter

Marina CMI [18]

It should be 20 Pa.

8 0

2 years ago

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

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