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Dima020 [189]
3 years ago
6

Describe a well-known hypothesis that was discarded because it was found to be untrue.earth-centered model of the universe. the

movement of sun, moon, and earth
Physics
1 answer:
polet [3.4K]3 years ago
6 0
The widely accepted hypothesis before that turned out wrong was the Earth-Centered theory or the Geocentric Theory. This was proposed by the philosopher Ptolemy. He came about to this hypothesis from hi observation that from the Earth's perspective, the celestial bodies like the Sun, stars and the moon, look like they rotate around the Earth each day and night. However, this was disproved by Galileo Galelei by his Heliocentric Theory. He observed through the telescope that the Venus also changes phases like the moon. However, he deduced that this is not possible from the positions of the Venus, Earth, Moon and Sun. 
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Ultrasound is used to scan the unborn baby of a pregnant mother.
hram777 [196]
Explanation:

Echo method formula for speed of sound : 2 x distance / time taken

2 x distance / 58 = 1540 m/s
2 x distance = 1540 m/s / 58 s
= 26.55172414 m
Distance = 26.55172414 / 2
= 13.27586207
= 13 m
4 0
2 years ago
You're sitting in the back of a taxi and place your bag on the seat next to you. The taxi enters a traffic circle and travels th
svp [43]

Answer:

(d) III only

Explanation:

We have to observe the motion of the bag with respect to taxi , considering taxi as stationary or inertial frame . Since bag is not moving with respect  to taxi , the inertial frame that means , net force on it is zero .So option i and ii are ruled out .

Now how to explain motion of the bag ie why it is stationary ie what are the balancing force acting on it. We know that on a body on circular path , a force called centripetal force is acting on it . So that force must be acting on it . The balancing force is the frictional force which is keeping it stationary with respect to taxi . Hence the third option is correct.

5 0
3 years ago
If the core of jupiter is 30,000 celcius and it is five times hotter than the sun, what's the temperature of the surface of the
VMariaS [17]
Let, the temperature of Sun's surface = c

So, 5c = 30, 000
c = 30,000 / 5
c = 6,000

In short, Your Answer would be 6000

Hope this helps!
6 0
4 years ago
Read 2 more answers
You can use a table or a graph to ___________Your findings
777dan777 [17]
To present your findings/data
5 0
3 years ago
If a spring constant of 128N/m is compressed by 0.18 m , how much potential energy is the spring?
Mademuasel [1]

Answer:

2.1J

Explanation:

Given parameters:

Spring constant  = 128N/m

Compression  = 0.18m

Unknown:

Potential energy of the spring  = ?

Solution

The potential energy of the spring is the elastic potential energy within the spring.

 To solve this;

   Elastic potential energy  = \frac{1}{2}  k e²  

k is the spring constant

e is the compression

 Now;

     Elastic potential energy  =  \frac{1}{2} x 128 x 0.18²  = 2.1J

7 0
3 years ago
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