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algol [13]
3 years ago
13

How do contact forces such as friction differ from gravitational and magnetic forces?

Physics
1 answer:
Sloan [31]3 years ago
7 0
"Contact" means "touching".  A contact force can't act on an object unless
they're touching. Friction is a contact force.

Gravitational forces pull masses together even if they're not touching.
Magnetic forces pull a piece of iron toward a magnet even if they're not touching.

Gravitational and magnetic forces are "non-contact" forces.
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How can you tell if your arm is brocken?
wlad13 [49]
Well if you're experiencing severe pain obviously you can tell its broken
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3 years ago
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What happens to light waves from a star as the star moves away from Earth?
AURORKA [14]
<h2>Answer: Light waves have a redshift due to the Doppler effect </h2>

The astronomer Edwin Powell Hubble observed several celestial bodies, and when obtaining the spectra of distant galaxies he observed the spectral lines were displaced towards the red (red shift), whereas the nearby galaxies showed a spectrum displaced to the blue.  

From there, Hubble deduced that the farther the galaxy is, the more redshifted it is in its spectrum. <u>The same happens with the stars and this phenomenom is known as the Doppler effect. </u>

This phenomenon refers to the change in a wave perceived frequency (or wavelength=color) when the emitter of the waves, and the receiver (or observer in the case of light) move relative to each other.  For example, as a star moves away from the Earth, its espectrum turns towards the red.

8 0
4 years ago
A spring has a natural length of 14 cm. If a 23-N force is required to keep it stretched to a length of 20 cm, how much work W i
lubasha [3.4K]

Answer:

1.78 J

Explanation:

Find the spring coefficient using Hooke's law:

F = k Δx

23 N = k (0.20 m − 0.14 m)

k = 383.33 N/m

The work is the change in energy:

W = PE₂ − PE₁

W = ½ kx₂² − ½ kx₁²

W = ½ k (x₂² − x₁²)

W = ½ (383.33 N/m) ((0.17 m)² − (0.14 m)²)

W = 1.78 J

4 0
3 years ago
Two or more velocities add by ____?<br><br> Plz help
VladimirAG [237]
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R= \sqrt{(R_x)^2+(R_y)^2}
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where \alpha is its direction with respect to the x-axis.
3 0
3 years ago
Read 2 more answers
A force of 100.0N is appliesd to an object of mass 85.0kg. what is the object acceleration
kumpel [21]

Answer:

<h2>1.18 m/s²</h2>

Explanation:

The acceleration of an object given it's mass and the force acting on it can be found by using the formula

a =  \frac{f}{m}  \\

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From the question we have

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We have the final answer as

<h3>1.18 m/s²</h3>

Hope this helps you

3 0
3 years ago
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