Answer:
The frequency what Steve will hear is option a) f'≅ 11kHz
Explanation:
f= 10 kHz
v= 340 m/s
vf= 30 m/s
vo= 0
f'= f * (v/ v- vf)
f'=10.96 kHz ≅ 11 kHz
Answer:
intensity is 11.0145 W/m^2
Energy is 5.07 J
Explanation:
Given data
amplitude E =91.1 V/m
area = 0.0269 m2
time t = 17.1 s
to find out
intensity and energy
solution
we know intensity formula that is given below
intensity = E(rms)² / (cμ0)
here c is speed of light and μo is permeability of free space
we know these constant value c = 2.99 x 10^8
μo = 1.26 x 10^-6
put all these value and we get intensity
intensity = (91.1/√2)² / (2.99 x 10^8 × 1.26 x 10^-6)
intensity = 4149.605 / 3.7674 x 10^2
intensity is 11.0145 W/m^2
and Energy is calculated by this formula
Energy = intensity × time × area
put all value now here
Energy = 11.0145 × 17.1 × 0.0269
Energy is 5.07 J
Answer:
time taken = 7.514 seconds
Here given:
using the given formula:
Answer:
5.87 m, 75.5°
Explanation:
Let's say C is the resultant vector.
The x component is the sum of the x components of A and B.
Cx = Ax + Bx
Cx = 10.1 cos 60° + 7.3 cos 275°
Cx = 5.69
The y component is the sum of the y components of A and B.
Cy = Ay + By
Cy = 10.1 sin 60° + 7.3 sin 275°
Cy = 1.47
The magnitude is found with Pythagorean theorem, and the angle is found with trigonometry.
C² = Cx² + Cy²
C² = 5.69² + 1.47²
C = 5.87
θ = atan(Cy / Cx)
θ = atan(5.69 / 1.47)
θ = 75.5°