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cricket20 [7]
3 years ago
8

In the history of astronomy, which of the following is true? . A] Tycho Brahe built one of the first observatories. B] Ptolemy w

as criticized for his work on the heliocentric model. C] Nicolaus Copernicus argued that the sun was the center of the universe. .D] Johannes Kepler argued that Earth was the center of the universe. . .
Physics
2 answers:
matrenka [14]3 years ago
6 0

Answer: C] Nicolas Copernicus argued that the sun was the center of the universe.

Explanation:  

The first observatory was built for Tycho Brahe, a Danish astronomer on the island of Hven by King Frederick II of Denmark. Ptolemy supported the geocentric model which considered Earth to be at the center of the universe. Johannes Kepler supported the heliocentric model.

Thus, the only true statement from the given options is that Nicolas Copernicus argued that the Sun was the center of the universe. He proposed the Heliocentric model. He believed the Sun to be the center and every other object - planets , stars revolved about the Sun.

Gelneren [198K]3 years ago
4 0
D. <span>Johannes Kepler argued that Earth was the center of the universe.

</span>
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A cyclist going downhill is accelerating at 1. 2 m/s2. If the final velocity of the cyclist is 16 m/s after 10 seconds, what is
mel-nik [20]

Answer:

\boxed {\boxed {\sf v_i= 4 \ m/s}}

Explanation:

We are asked to find the cyclist's initial velocity. We are given the acceleration, final velocity, and time, so we will use the following kinematic equation.

v_f= v_i + at

The cyclist is acceleration at 1.2 meters per second squared. After 10 seconds, the velocity is 16 meters per second.

  • v_f= 16 m/s
  • a= 1.2 m/s²
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Substitute the values into the formula.

16 \ m/s = v_i + (1.2 \ m/s^2)(10 \ s)

Multiply.

16 \ m/s = v_i + (1.2 \ m/s^2 * 10 \ s)

16 \ m/s = v_i + 12 \ m/s

We are solving for the initial velocity, so we must isolate the variable v_i. Subtract 12 meters per second from both sides of the equation.

16 \ m/s - 12 \ m/s = v_i + 12 \ m/s -12 \ m/s

4 \ m/s = v_i

The cyclist's initial velocity is <u>4 meters per second.</u>

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2 years ago
B. Jerome plays middle linebacker for South's varsity football team. In a game against
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Answer:

Option D

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Final momentum is also mv but v being westward direction, we take it negative

Final momentum=82*-2.5= -205 Kg.m/s

Change in momentum=Final momentum-Initial momentum=-205-459.2=-664.2 Kg.m/s

Impulse=change in momentum=664.2 Kg.m/s rounded off as 670 Kg.m/s

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