V = 1/2at^2
a = 9.8 m/2^2 (constant)
t = 4.0 s
1/2 • 9.8 • 4^2
1/2 • 9.8 • 16
= 78.4 m/s
Answer:
359 m/s
Explanation:
Highest frequency a person can hear is 20,000Hz.
f = c × λ
Frequency = Wave speed × Wavelength
Wavelength = 20,000 ÷ 343 = 58.31m
Wavespeed = Frequency ÷ Wavelength
c = 20,950 ÷ 58.31 = 359.3 m/s
= 359 m/s (3 s.f.)
Answer:
Galaxies move in a random pattern.
<span>Metals have a large number of free outer electrons that allow for
the movement of electrons through them. Just a hint of voltage
along a piece of metal is enough to persuade some of the free
electrons to move in the direction of increasing voltage. </span>