There are 90 degrees directly overhead. Barnard is at 74 degrees at Sam's position, 1300.0 kilometers south. The part of the 360 degree circle that corresponds to Hua's circumference is the difference between 90 and 74, or 16 degrees. 1300.0 km is therefore 16/360 of the circle, or 0.044 times the circumference. 29.250 km is the circumference (1300 divided by 0.044). Radius divided by two gives the circumference equation. Therefore, 2r=29250 and the radius of Hua=4655.3 km
<h3>
What do you mean by Astronomy?</h3>
Astronomy is a scientific science that examines celestial objects and phenomena (from the Ancient Greek "o" (astronoma), "science that investigates the laws of the stars"). In order to describe their creation and evolution, it makes use of mathematics, physics, and chemistry. Planets, moons, stars, nebulae, galaxies, and comets are among the interesting celestial bodies. Supernova explosions, gamma ray bursts, quasar, blazar, pulsar, and cosmic microwave background radiation are examples of relevant phenomena. Astronomy is the study of everything that comes from outside the atmosphere of the Earth. Astronomical cosmology is the study of the cosmos as a whole.
To know more about Astronomy visit:
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Answer:
it has constant angular velocity
Explanation:
an object moving in a uniform circular motion moves with constant angular velocity about a point
The answer is <span>A. 1/4 as much.
</span>
To calculate this, we will use Coulomb's Law:
F = k*Q1*Q2/r²
<span>where F is repulsive force, k is constant, Q is charge, r is distance between charges.</span>
k = 5.0 × 10⁹ N*m/C²
<span><span> <span> <span> <span> </span></span> </span></span> </span>
Let's take one example where:
Q1 = Q2 = 1.2 × 10⁻⁶ C²
r₁ = 0.5 m
So, F1 = k*Q1*Q2/r₁² = 5.0 × 10⁹ * 1.2 × 10⁻⁶ * 1.2 × 10⁻⁶ /0.5² = 12.96 × 10⁻²/0.25 = 51.84 × 10⁻² = 0.5184 ≈ 0.52
Let's now double r:
r₂ = 2r₁ = 2*0.5 = 1
And let's calculate force:
F2 = k*Q1*Q2/r₂² = 5.0 × 10⁹ * 1.2 × 10⁻⁶ * 1.2 × 10⁻⁶ /1² = 12.96 × 10⁻²/1 = 12.96 × 10⁻² = 0.1296 ≈ 0.13
And now, let's see how much is the second force (F2) differ from the first force (F1):
F2/F1 = 0.13/0.52 = 1/4
The towboat moves the ship by a distance
so the work done by the towboat to move the ship is the product between the force applied and this distance:
The time taken for this process is
So the power used by the twoboat is the ratio between the work done and the time taken
