The average speed of a runner in a 400.-meter race is 8.0 meters per second. how long did it take the runner to complete the rac
2 answers:
Answer:
Time taken, t = 50 seconds
Explanation:
It is given that,
Distance covered by the runner, d = 400 m
Average speed of the runner, v = 8 m/s
Let t is the time taken by the runner to complete the race. It can be calculated using the concept of average velocity. The total distance covered divided by total time is called average speed of the runner as :
t = 50 seconds
So, the time taken by the runner to complete the race is 50 seconds. Hence, this is the required solution.
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Answer:
B.) by interfering with sound waves
Explanation:
As we know that the interference of sound waves is of two types
1). constructive interference
2). destructive interference
now we know that constructive interference means the resultant intensity will be more than the intensity of interfering waves as here two waves are in same phase.
In destructive interference the resultant of two waves is given by the minimum resultant of the intensity as here the phase of two waves are opposite to each other.
So we will say that
here in case of noise cancelling headphones we know that the phase of noise is always made in opposite phase with the sound which is used to cancelled the noise.
This will reduce the noise and we will get a clear sound
Answer:
v = 384km/min
Explanation:
In order to calculate the speed of the Hubble space telescope, you first calculate the distance that Hubble travels for one orbit.
You know that 37000 times the orbit of Hubble are 1,280,000,000 km. Then, for one orbit you have:
You know that one orbit is completed by Hubble on 90 min. You use the following formula to calculate the speed:
hence, the speed of the Hubble is approximately 384km/min