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Mandarinka [93]
3 years ago
5

Why does an astronaut in a spacecraft orbiting Earthexperience a feeling of weightlessness?

Physics
1 answer:
slava [35]3 years ago
4 0

Answer:

Astronaut in spacecraft while orbiting earth experience weightlessness because there is no gravity of earth or moon is acting on the body of an astronaut.                      

while on earth, we experience weight because the gravity of earth is acting on our body which is pulling us downward.

Both spacecraft and the astronauts both are in a free-fall condition.

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To get up on the roof, a person (mass 70.0kg) places a 6.00-m aluminum ladder (mass 10.0 kg) against the house on a concrete pad
Julli [10]

The magnitude of the forces acting at the top are;

\mathbf{F_{Top, \ x}} = 132.95 N

\mathbf{F_{Top, \ y}} = 0

The magnitude of the forces acting at the bottom are;

\mathbf{F_{Bottom, \ x}} = \mathbf{ F_f} = -132.95 N

\mathbf{F_{Bottom, \ y}} = 784.8 N

The known parameters in the question are;

The mass of the person, m₁ = 70.0 kg

The length of the ladder, l = 6.00 m

The mass of the ladder, m₂ = 10.0 kg

The distance of the base of the ladder from the house, d = 2.00 m

The point on the roof the ladder rests = A frictionless plastic rain gutter

The location of the center of mass of the ladder, C.M. = 2 m from the bottom of the ladder

The location of the point the person is standing = 3 meters from the bottom

g = The acceleration due to gravity ≈ 9.81 m/s²

The required parameters are;

The magnitudes of the forces on the ladder at the top and bottom

The strategy to be used;

Find the angle of inclination of the ladder, θ

At equilibrium, the sum of the moments about a point is zero

The angle of inclination of the ladder, θ = arccos(2/6) ≈ 70.53 °C

Taking moment about the point of contact of the ladder with the ground, <em>B </em>gives;

\sum M_B = 0

Therefore;

\sum M_{BCW} = \sum M_{BCCW}

Where;

\sum M_{BCW} = The sum of clockwise moments about <em>B</em>

\sum M_{BCCW} = The sum of counterclockwise moments about <em>B</em>

Therefore, we have;

\sum M_{BCW} = 2  × (2/6) × 10.0 × 9.81 + 3.0 × (2/6) × 70 × 9.81

\sum M_{BCCW} = F_R × √(6² - 2²)

Therefore, we get;

2  × (2/6) × 10.0 × 9.81 + 3.0 × (2/6) × 70 × 9.81  = F_R × √(6² - 2²)

F_R  = (2  × (2/6) × 10.0 × 9.81 + 3.0 × (2/6) × 70 × 9.81)/(√(6² - 2²)) ≈ 132.95

The reaction force on the wall, F_R ≈ 132.95 N

We note that the magnitude of the reaction force at the roof, F_R = The magnitude of the frictional force of bottom of the ladder on the floor, F_f but opposite in direction

Therefore;

F_R = -F_f

F_f = - F_R ≈ -132.95 N

Similarly, at equilibrium, we have;

∑Fₓ = \sum F_y = 0

The vertical component of the forces acting on the ladder are, (taking forces acting upward as positive;

\sum F_y = -70.0 × 9.81 - 10 × 9.81 + F_{By}

∴ The upward force acting at the bottom, F_{By} = 784.8 N

Therefore;

The magnitudes of the forces at the ladder top and bottom are;

At the top;

\mathbf{F_{Top, \ x}} = F_R ≈ 132.95 N←

\mathbf{F_{Top, \ y}} = 0 (The surface upon which the ladder rest at the top is frictionless)

At the bottom;

\mathbf{F_{Bottom, \ x}} = F_f ≈ -132.95 N →

\mathbf{F_{Bottom, \ y}} = F_{By} = 784.8 N ↑

Learn more about equilibrium of forces here;

brainly.com/question/16051313

8 0
3 years ago
iv. An object is 14 cm in front of a convex mirror. The image is 5.8 cm behind the mirror. What is the focal length of the mirro
Dvinal [7]

Answer:

C. 9.9 cm

Explanation:

The location of the object, u = 14 cm

The location of the image, v = 5.8 cm

The focal length of the mirror, f = Required

The mirror formula for a convex mirror is given as follows;

\dfrac{1}{u} -\dfrac{1}{v} = -\dfrac{1}{f}

Therefore, we get;

\dfrac{1}{14 \ cm} -\dfrac{1}{5.8 \ cm} =- \dfrac{41}{406 \ cm} = -\dfrac{1}{f}

Therefore;

f = \dfrac{406 \ cm}{41}  \approx 9.9 \ cm

The focal length of the mirror, f ≈ 9.9 cm

6 0
3 years ago
The batter swings his bat 1.8 meters in 0.1 seconds. How fast is his bat speed in meters per second?
bogdanovich [222]

Answer:

18 m/s

Explanation:

1.8 meters / 0.1 seconds = 18 m/s

5 0
3 years ago
Please help, I’m confused
riadik2000 [5.3K]

Answer:

1 is the correct answer plz mark me as branilest answer

4 0
3 years ago
The model of the atom has changed as scientists have gathered new evidence. Four models of the atom are shown below, but one imp
maks197457 [2]

Answer:

Thomson’s model

Explanation:

Thompson regarded the atom largely as a sphere of positively charged matter in which negative charges were embedded.

This came to be known as the plum pudding model of the atom because it resembles a pudding studded with currants.

This was an early model of the atom and did not survive further experimental scrutiny of the structure of the atom.

7 0
3 years ago
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