Answer:
v = 10 m/s
Explanation:
Given that,
Distance covered by a sprinter, d = 100 m
Time taken by him to reach the finish line, t = 10 s
We need to find his average velocity. We know that velocity is equal to the distance covered divided by time taken. So,
v = d/t
Hence, his average velocity is 10 m/s.
Answer:
The distance travelled on the freeway is 149.5 miles.
Explanation:
The school bus travels on the freeway at constant speed. According to the statement, we need to calculate the distance travelled by the vehicle by means of the following formula:
(1)
Where:
- Traveled distance, in miles.
- Speed, in miles per hour.
- Time, in hours.
If we know that and
, then the distance travelled by the school bus is:
The distance travelled on the freeway is 149.5 miles.
a) The speed of the wave will increase by a factor .
b) The speed of the wave will halve
c) The speed of the wave will double
Explanation:
a)
The speed of a standing wave on a string is given by
where
T is the tension in the string
m is the mass of the string
L is the length of the string
In this part of the problem, the tension in the string is doubled, so that the new tension is
T' = 2T
Substituting into the equation, we find the new speed of the wave in the string:
So, the speed will increase by a factor .
b)
We can solve also this part by referring to the formula
where
T is the tension
m is the mass
L is the length
In this case, the string mass is quadrupled, so the new mass is:
m' = 4m
Substituting into the equation, we find what happens to the speed of the wave:
So, the speed of the wave will halve.
c)
Again, we can solve this part by referring to the same equation
where
T is the tension
m is the mass
L is the length
In this case, the length of the string is quadrupled, so the new length is:
L' = 4L
Substituting into the equation, we find that the new speed is:
So, the speed of the wave will double.
Learn more about waves:
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