Answer:
B. has a smaller frequency
C. travels at the same speed
Explanation:
The wording of the question is a bit confusing, it should be short/long for wavelength and low/high for frequency. I assume low wavelength mean short wavelength.
All sound wave travel with the same velocity(343m/s) so wavelength doesn't influence its speed at all. It won't be faster or slower, it will have the same speed.
Velocity is a product of wavelength and frequency. So, a long-wavelength sound wave should have a lower frequency.
The option should be:
A. travels slower -->false
B. has a smaller frequency -->true
C. travels at the same speed --->true
D. has a higher frequency --->false
E. travels faster has the same frequency --->false
Answer:
14.7 m/s
Explanation:
Since the motion of the ball is a uniformly accelerated motion, we can find the initial speed by using the following suvat equation:
where
s is the vertical displacement
u is the initial velocity
t is the time
a is the acceleration
In this problem, we have:
s = 0 (because at the end of the motion, the ball returns to its original position)
u = ?
is the acceleration of gravity (negative because it is downward)
is the total time of flight
Solving for u, we find the initial velocity of the ball:
![0=ut+\frac{1}{2}at^2\\u=-\frac{1}{2}at=-\frac{1}{2}(-9.8)(3)=14.7 m/s](https://tex.z-dn.net/?f=0%3Dut%2B%5Cfrac%7B1%7D%7B2%7Dat%5E2%5C%5Cu%3D-%5Cfrac%7B1%7D%7B2%7Dat%3D-%5Cfrac%7B1%7D%7B2%7D%28-9.8%29%283%29%3D14.7%20m%2Fs)
<span>Answer: V/n = constant</span>
Direct evidence is evidence heard from a witness about the subject in question. For instance, if there is a terrorist attack carried out by an independent person, the people close to them could supply crucial evidence, such as if they were acting weirdly in the past month. Hope this helped!