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Mandarinka [93]
3 years ago
9

a meteor is falling towards earth with 4m/s^2 acceleration due to gravity. if mass and radius of the earth are 6*10^24kg and 6.4

*10^6m respectively, find the height of meteor.
Physics
1 answer:
Morgarella [4.7K]3 years ago
3 0

Answer:

3.6×10⁶ m

Explanation:

g = GM / R²

4 m/s² = (6.67×10⁻¹¹ m³/kg/s²) (6×10²⁴ kg) / (6.4×10⁶ m + h)²

(6.4×10⁶ m + h)² = 1.00×10¹⁴ m²

6.4×10⁶ m + h = 1.00×10⁷ m

h = 3.6×10⁶ m

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Sunny_sXe [5.5K]

Answer:

41.0 m/s, 10.6 s

Explanation:

Given:

a = -4.8 m/s²

Δy = 165 m

v = -10.0 m/s

Find: v₀ and t

v² = v₀² + 2aΔy

(-10.0 m/s)² = v₀² + 2(-4.8 m/s²) (165 m)

v₀ = 41.0 m/s

Δy = vt − ½ at²

165 m = (-10.0 m/s) t − ½ (-4.8 m/s²) t²

165 = -10t + 2.4t²

0 = 2.4t² − 10t − 165

Solve with quadratic formula:

t = [ -(-10) ± √((-10)² − 4(2.4)(-165)) ] / 2(2.4)

t = (10 ± √1684) / 4.8

t = 10.6 s

4 0
3 years ago
Which is one piece of information that astronomers use to calculate the age of the universe?
Valentin [98]

Answer:

  • the age of the oldest stars
  • patterns of background radiation
  • how fast distant galaxies are moving away from us

Explanation:

According to the NASA, astronomers can estimate how old the universe is by comparing the age of the oldest stars and the rate of expansion of the universe. The rate of expansion of the universe is based on the Big Bang theory and it states that our universe is continuously expanding since it first developed. Astronomers measure Cosmic Microwave Background radiation resulting from the Big Bang.

8 0
4 years ago
Complete this sentence. If the mass of an object blank, the weight of an object will blank
Archy [21]

If the mass of an object doubles, the weight of the object also doubles

If the mass of an object halves, the weight of the object also halves

Explanation:

The mass of an object is an intrinsec property of the object that gives a measure of the "amount of matter" in the object. Mass is indipendent from the location of the object.

On the contrary, weight gives a measure of the force of gravitational attraction felt by the object in a gravitational field. Weight is dependent on the location.

The mass and the weight of an object are related by the following equation:

W=mg

where:

W is the weight of the object

m is its mass

g is the acceleration of gravity

We see from the formula that the weight of an object is directly proportional to its mass. This means the following:

  • If the mass of an object doubles, the weight of the object also doubles
  • If the mass of an object halves, the weight of the object also halves

Learn more about forces and weight:

brainly.com/question/8459017

brainly.com/question/11292757

brainly.com/question/12978926

#LearnwithBrainly

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3 years ago
A guitar string sends out waves that hit your ear. in 2 seconds, 76 wave cycles hit your ear
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Answer:

a

Explanation:

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9.0, might be to late but someone in the future might need it.
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