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pogonyaev
3 years ago
6

Which two explanations are based on personal beliefs

Physics
1 answer:
agasfer [191]3 years ago
5 0

Answer: 1: A constellation position in the night sky can be used to predict events in a personal life

2: certain mineral crystals have properties that help protect the body From illness

Explanation: I just took the test

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Select the correct answer. A body travels 10 meters during the first 5 seconds of its travel, and it travels a total of 30 meter
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2 m/s

Explanation:

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A Web site that ends in .gov or .edu is probably unreliable.<br> True<br> False
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false, they are more reliable.

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2. A compression wave, like sound, is a kind of ____________?_________ wave.
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Answer:

Explanation:

2. A compression wave, like sound, is a kind of <u>mechanical</u> wave.

3. When a wave reflects off a surface, the angle of <u>incidence</u> always equals the angle of <u>reflection</u>.

4. The wailing change of the pitch that you hear as a locomotive approaches and then recedes from you is called <u>Doppler Shift</u>.

3 0
3 years ago
A model rocket is launched straight upward from the surface of the Earth at a speed of 50 m/s. If air resistance is negligible,
romanna [79]

Answer:

The instantaneous velocity of the rocket the moment before it hits the ground is 50 m/s.

Explanation:

Given;

initial velocity of the rocket, u = 50 m/s

Determine the maximum height reached by the rocket.

at maximum height reached by the rocket, the final velocity, v = 0

v² = u² -2gh

0 = 50² - 2(9.8)h

19.6h = 2500

h = 2500 / 19.6

h = 127.55 m

At maximum height, the time to reach ground is given by;

h = ¹/₂gt²

t = \sqrt{\frac{2h}{g} } \\\\t =  \sqrt{\frac{2*127.55}{9.8} }\\\\ t = 5.1 \ s

Before the rocket hits the ground the final velocity will be maximum;

v = u + gt

v = 0 + 9.8 x 5.1

v = 50 m/s

Therefore, the instantaneous velocity of the rocket the moment before it hits the ground is 50 m/s.

3 0
4 years ago
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