Physics, 13.02.2021 17:00 jasmelynn16

Please help me
Please answer correctly
Will give the brainliest!
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Please help mePlease answer correctlyWill give the brainliest!Urgent !!!

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Answer from: mirianplacencia27

B) the girls repeated the experiment 5 times so that the results would be accurate
C) calculate the mean so (2.95 +3+ 2.9+ 3.2 +2.95) and then divide it all by 5 (just plug it into a calculator for your answer.
I cant read D so I hope this helps and please mark as brainliest, I’m trying to level up.

Answer from: Daking23

Explanation:

Look at the variation in times. It makes quite a difference each time the experiment is repeated. Added to that, there is no mention about what they did about reaction time which would alter the results considerably.

Get the average for the time.

Time for each trial

Total Time = 2.95+3+2.90+3.20+2.95 = 15

Average Time = 15/5 = 3.00 seconds

Speed of Sound = distance divided by time

Speed of Sound = 500 * 2 / 3 = 333 meters / second

Yes. The girl has made a very astute observation. Remember that sound is a wave and it depends on the media it is in. If the media is moving, then the speed of sound will have to take into consideration how fast the media is going and whether the sound is travelling with the media or against it or at some angle to the direction of the sound wave.

To help you understand this question, you probably have taken problems were a boat is travelling up stream or down stream and the water is flowing. The speed is calculated as v_boat + river speed and v_boat - river speed.

If you haven't seen this problem get, you will.

Answer from: Quest

the only real purpose of sputnik 1 was to beat the us into space. we were getting close to launching a useful satellite, explorer 1 - which launched on january 31, 1958. the ussr had to beat that, so they launched sputnik 1 on october 4, 19

Answer from: Quest

weight of the box is given as

$w = 112.1 n$

here this is placed on the inclined of angle 42 degree

now this weight will have two components one is along the incline other is perpendicular to it

so here we need to apply a force parallel to incline opposite to its component of weight

so here the component of weight is given as

$w_x = w sin\theta$

here we have

$w = 112.1 n$

$w_x = 112.1 sin42$

$w_x = 75 n$

so it requires 75 n force to move it upwards

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