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Svetlanka [38]
3 years ago
7

The atomic model that describes an atom as a spherical object containing a certain number of electrons trapped in a mass of posi

tive charge is often called the __________ model. (Points : 1)
electron cloud

raisin bread

molecular

nuclear
Physics
2 answers:
kirza4 [7]3 years ago
8 0
Electrons trapped in a mass of positive charge is often called the raisin bread model
irina [24]3 years ago
5 0
That type of model was called the raisin bread model, founded by JJ Thompson.
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Does energy or matter ever disappear? Explain.
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A disk of a radius 50 cm rotates at a constant rate of 100 rpm. What distance in meters will a point on the outside rim travel d
Iteru [2.4K]

Answer:

A point on the outside rim will travel 157.2 meters during 30 seconds of rotation.

                         

Explanation:

We can find the distance with the following equation since the acceleration is cero (the disk rotates at a constant rate):

d = v*t

Where:

v: is the tangential speed of the disk

t: is the time = 30 s  

The tangential speed can be found as follows:

v = \omega*r

Where:

ω: is the angular speed = 100 rpm

r: is the radius = 50 cm = 0.50 m

v = \omega*r = 100 \frac{rev}{min}*\frac{2\pi rad}{1 rev}*\frac{1 min}{60 s}*0.50 m = 5.24 m/s    

Now, the distance traveled by the disk is:

d = v*t = 5.24 m/s*30 s = 157.2 m

Therefore, a point on the outside rim will travel 157.2 meters during 30 seconds of rotation.

I hope it helps you!

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