Answer:
14.32 Hz
Explanation:
Given:
Frequency of the horn, f₀ = 395 Hz
Speed of the car, v = 12.0 m/s
Speed of the sound, c = 343 m/s
now, applying the doppler's effect formula, we have
where,
f is the observed frequency
on substituting the values, we get
or
f = 409.32 Hz
therefore,
the beat frequency heard is = f - f₀ = 409.32 - 395 = 14.32 Hz
Unit vector = v / |v|
= -12/√(-12)
= -j
The unit vector in the direction of v is -j.
Below are the choices that can be found from other sources:
A. change in climate
<span>B changes in the atmosphere </span>
<span>C changes in the fossil record </span>
<span>D changes in volcanic
</span>
The answer is <span>C. changes in the fossil record
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</span>
Answer:
h = 12.6 cm
Explanation:
given,
ground reaction = 788 N
time of force application = 0.9 s
BW = 670 N
Net force = 788 - 670
= 118 N
impulse = F x t
I = 118 x 0.9
I = 107.1 N s
impulse is equal to change in momentum
v = 1.57 m/s
v is the initial velocity before jump
now, height of center of mass
using equation of motion
v² = u² - 2 g h
h = 0.1257 m
h = 12.6 cm
the height of center of mass is equal to h = 0.126 m or 12.6 cm