Answer:
Δf = -82.57 Hz
Explanation:
For this problem we will use Doppler effect formula:
where:
C is the speed of sound
Vr is the velocity of the person = 0m/s
Vs is the velocity of the source (train): When approaching Vs = -41m/s and when receding Vs = 41m/s
fo = 342.5 Hz
When the train is approaching:
And when the train is receding:
So, the change of frequency will be:
Δf = fr - fa = 306.12 - 388.69 = -82.57 Hz
Answer: The truck's velocity after braking = 17m/s.
Explanation:
Given: Initial velocity(i) = 25 m/s
Time(t) = 4s
Acceleration(a) = -2 m/s ²
We use the following formula to compute final velocity (v):
![v= i+at\\\\\Rightarrow\ v=25+(-2)(4\ \ \ [\text{Substitute all values}]\\\\\Rightarrow\ v=25-8\\\\\Rightarrow\ v=17\ m/s](https://tex.z-dn.net/?f=v%3D%20i%2Bat%5C%5C%5C%5C%5CRightarrow%5C%20v%3D25%2B%28-2%29%284%5C%20%5C%20%5C%20%5B%5Ctext%7BSubstitute%20all%20values%7D%5D%5C%5C%5C%5C%5CRightarrow%5C%20v%3D25-8%5C%5C%5C%5C%5CRightarrow%5C%20v%3D17%5C%20m%2Fs)
Hence, the truck's velocity after braking = 17m/s.
Answer:
(That an object must be made out of metal to be attracted, but not all metals are attracted.) Metals such as iron, nickel, and cobalt are attracted to magnets. Steel has iron in it, so it is also attracted to magnets.
Explanation:
basically magnets
Answer:
If a negatively charged balloon is brought near one end of the rod but not in direct contact, then <u>the negative charges on the balloon repel the same amount of negative charges on the end of the rod that is close to the balloon</u>, and the positive charges stay at the balloon-side of the rod. The total charge of the rod is still zero, but the distribution of the charges are now non-uniform.
Because the fundamentalist interprets scriptures of the religion literally so new scientific knowledge has proven some of the events that happened in scriptures, that no one can comprehend in the old times. and the fundamentalist feel threatened because there are some of their beliefs are now contradicting
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