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3 years ago

Kepler's laws, satellites motion and weightlessness

Physics

1 answer:

Anon25 [30]3 years ago

3 0

Answer:

First Kepler law states that Each planet describes an ellipsoidal motion about the sun as its single focus.

Second Kepler law states that An imaginary line joining a planet to the Sun sweeps out equal areas in equal time intervals.

Third Kepler law states that The squares of period of revolution of the planet around the sun are proportional to the cubes of mean distance between the planet and the sun.

Weightlessness is the condition where the body has zero gravity ( its acceleration is equal to the acceleration due to gravity )

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While standing at the edge of the roof of a building, you throw a stone upward with an initial speed of 5.65 m/s. The stone subs

xxTIMURxx [149]

Answer:

1. 20.54m/s

2. 1.52s

Explanation:

QUESTION 1:

The speed the stone impact the ground is the final speed/velocity, which can be calculated using the formula:

v² = u² + 2as

Where;

v = final velocity (m/s)

u = initial velocity (m/s)

a = acceleration due to gravity (m/s²)

s = distance (m)

From the provided information, u = 5.65m/s, v = ?, s = 19.9m, a = 9.8m/s²

v² = 5.65² + 2 (9.8 × 19.9)

v² = 31.9225 + 2 (195.02)

v² = 31.9225 + 390.04

v² = 421.9625

v = √421.9625

v = 20.5417

v = 20.54m/s

QUESTION 2:

Using v = u + at

Where v = final velocity (m/s) = 20.54m/s

t = time (s)

u = initial velocity (m/s) = 5.65m/s

a = acceleration due to gravity (m/s²)

v = u + at

20.54 = 5.65 + 9.8t

20.54 - 5.65 = 9.8t

14.89 = 9.8t

t = 14.89/9.8

t = 1.519

t = 1.52s

3 0

3 years ago

At what point in the swing of the pendulum is the potential energy completely converted into Kinetic energy

artcher [175]

Point a because point a is the highest at potential energy converting into the highest kinetic energy.

4 0

3 years ago

Read 2 more answers

Four compasses are placed on a table top

motikmotik

Answer:

located diagonal

Explanation:

check ur text book bro

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3 years ago

What scenario would most likely lead to a higher level of physical fitness among people who live in a city?

ExtremeBDS [4]

More people walk to school or work hope this helps

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3 years ago

Three identical stars of mass M form an equilateral triangle that rotates around the triangle’s center as the stars move in a co

zheka24 [161]

Answer:

$v=\sqrt{\dfrac{2GM}{L}}$

Explanation:

M = Mass of planets

R = Radius of circle

v = Velocity

$\theta$ = Angle

The circle is inside the triangle

$cos\theta=\dfrac{\dfrac{L}{2}}{R}\\\Rightarrow R=\dfrac{L}{2cos\theta}$

The centripetal acceleration

$\dfrac{Mv^2}{R}=2\dfrac{GM^2}{L^2}cos\theta\\\Rightarrow \dfrac{Mv^2}{\dfrac{L}{2cos\theta}}=2\dfrac{GM^2}{L^2}cos\theta\\\Rightarrow \dfrac{Mv^22cos\theta}{L}=2\dfrac{GM^2}{L^2}cos\theta\\\Rightarrow v^2=\dfrac{2GM}{L}\\\Rightarrow v=\sqrt{\dfrac{2GM}{L}}$

The speed of the stars is $v=\sqrt{\dfrac{2GM}{L}}$

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3 years ago