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djverab [1.8K]
3 years ago
13

A star with no measurable parallax is very close to Earth. Please select the best answer from the choices provided T F

Physics
2 answers:
katrin [286]3 years ago
6 0
A star with no measurable parallax is very close to Earth. The statement is FALSE because Parallax angles of less than 0.01 arcsec are too difficult to measure from Earth because of the effects of the Earth's atmosphere, <span>only the </span>closer<span> ones have a </span>parallax<span> that is large enough to be measured, a</span>nd the diameter of the Earth's orbit is small compared to the distance to all but the nearest stars.
Ilya [14]3 years ago
5 0
That's false. The nearest objects are the ones with the greatest parallax.
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Which parameter of glass is measured with bromoform and bromobenzene mixtures in a column?
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The answer is Density.  The Density of the <span>glass is measured with bromoform and bromobenzene mixtures in a column.  </span>Density measurement<span> is done using Density gradient </span>columns. It is a <span> temperature-controlled density </span>column<span> containing a </span>mixture<span> of  b</span>romobenzene<span> and  </span>bromoform.
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3 years ago
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A ventilating fan is operated by 0.5hp electric motor. How much work in joules can the fan do in 3 hours? (I need the answer asa
shtirl [24]

Answer:

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T = 3hrs = 10800s

Power = Work done/ Time

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3 0
3 years ago
Write answers with significant figures:<br>a) 17.35 g +8.498 g​
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Answer:

25.9 g

Explanation:

= 17.35

8.498

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6 0
3 years ago
A penny is dropped from the top of a building that is 300.0 m tall. Calculate the speed of the penny as it hits the ground. (met
Sauron [17]

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Substituting

   300 = 0*t+\frac{1}{2} *9.8*t^2\\ \\ 4.9t^2 = 300\\ \\ t =7.82 seconds

Now we have v = u+at, where v is the final velocity

Here u = 0 m/s, a= 9.81 m/s^2 and t = 7.82 seconds

Substituting

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The speed with which the penny strikes the ground = 76.68 m/s.

3 0
3 years ago
a 1-kg discus is thrown with a velocity of 19 m/s at an angle of 35 degrees from the vertical direction. calculate the vertical
nlexa [21]

Answer:

Vx =  10.9 m/s ,  Vy = 15.6 m/s

Explanation:

Given velocity V= 19 m/s

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θ = 55°

to Find Vx = ? and Vy= ?

Vx = V cos θ

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Vx = V sin θ

Vy = 19 m/s  × sin 55°

Vy = 15.6 m/s

6 0
3 years ago
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