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8090 [49]
3 years ago
5

In the video, you saw that models must sometimes be changed. why does that happen?

Physics
2 answers:
Zielflug [23.3K]3 years ago
5 0

Models often need to be changed and updated based on new evidence.

inn [45]3 years ago
4 0
Because scientific data and discoveries will always keep coming out, so models must be updated from time to time.
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The Earth orbits the Sun with a period of 3.16 x 107 seconds (1 year!) at a distance of 1.5 x 1011 m. The mass of the Earth is 6
SVETLANKA909090 [29]

Answer:

a) M = 2  10³⁰ kg ,  b)    T_{m} = 5.81 10⁷ s

Explanation:

a) For this exercise let's use Newton's second law where force is the law of universal gravitation and acceleration is centripetal

           G m M / R² = m a

            a = v² / R

             G M / R = V²

The orbit of the two planets is approximately circular, therefore the velocity module (speed) is constant

            v = d / t

The distance is the length of the circular orbit

           d = 2π R

          G M / R = 4π² R² / T²

          G M T² = 4π² R³

Let's write this equation for each planet

For the earth

The period is T = 3.16 10⁷ s and the radius of the orbit R = 1.5 10¹¹ m, let's calculate the mass of the sun

         M = 4π² R³ / G T²

         M = 4π² (1.5 10¹¹)³ / (6.67 10⁻¹¹ (3.16 10⁷)²)

         M = 133.24 10³³ / 66.60 10³

         M = 2  10³⁰ kg

b) For this part we write this equation for the two points

For the earth

         T_{E}² = (4π² / G M)  R_{E}³

For mars

          T_{m}² = (4π² / G M)  R_{m}³

Let's divide the two expressions

         T_{m}² /  T_{E}² =  R_{m}³ /  T_{E}³

They indicate that the orbit of Mars is  R_{m} = 1.5  R_{E}

        T_{m}² /  T_{E}² = (1.5  R_{E} /  R_{E})³

        T_{m}² =  T_{E}² 1.5³

        T_{m}² = (3.16 10⁷)²  1.5³

        T_{m} = √ (33.70 10¹⁴)

        T_{m} = 5.81 10⁷ s

5 0
4 years ago
A rugby player passes the ball 6.8 m across the field, where the ball is caught at the same height as it left his hand. show ans
kherson [118]

Answer:

11.86°

Explanation:

Projectile motion is a form of motion where an object moves in parabolic path (trajectory). Projectile motion only occurs when there is one force applied at the beginning on the trajectory, after which the only interference is from gravity.

The range of an object experiencing projectile motion is given by:

R = u²sin(2θ) / g

where u is the initial velocity, θ is the angle with horizontal and g is the acceleration due to gravity

Given that R = 6.8 m, g = 10 m/s², u = 12 m/s.  

R = u²sin(2θ) / g

substituting:

6.8 = 13²sin(2θ) / 10

13²sin(2θ) = 68

sin(2θ) = 0.4024

2θ = sin⁻¹(0.4024)

2θ = 23.73

θ = 11.86°

3 0
3 years ago
How many turns are in the secondary coil of a step up transformer that increases voltage from 30 V to 150 V and has seven turns
Mademuasel [1]

350 + 507 = 3657 that would be your answer

7 0
4 years ago
List three different types of magnets
Gennadij [26K]
The three types of magnets are temporary, permanent, and electromagnets.
4 0
3 years ago
Read 2 more answers
Shelley gives her little sister a 5-meter head start in a bike race. The race ends 15 meters east from where Shelley started. If
Igoryamba

Answer:

The answer is 2 m/s east

Explanation:

4 0
3 years ago
Read 2 more answers
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