Answer
given,
I is the loudness of sound
I = 10 Log₁₀ r
r is relative intensity
at when relative intensity is 10⁶
I = 60 dB
how much louder when 100 people would be talking together
I = 10 Log₁₀ r
I = 10 Log₁₀ (10⁶ x 100)
I = 10 Log₁₀ (10⁸)
I = 80 dB
hence, the intensity will be increased by (80 dB -60 dB) 20 dB when 100 people start talking together.
The spring's elastic potential energy is converted into elastic potential energy of the boy.
Potential energy = elastic energy
mgh = 1/2 kx²
k = (2 * 25 * 9.81 * 0.5) / 0.4²
k = 1533 N/m
We will apply
2as = v² - u², with u = 0
a = F/m
F = kx
a = kx/m
v = √(2 x 0.4 x (0.4 x 1533 / 25))
v = 4.43 m/s
Answer:
a and c
Explanation:
a)light moves in a straight line and distracts when it encounters an obstacle forming a shadow
c)the light rays from that object or also tgose from the image must enter your eye for you to see that image
Image #3 good luck!!!!!!!!!!!
The answer to this question is "Greater than". As per the OSHA or Organizational Health and Health Organization, a noise level of 95 DB or decibels is greater than the lowest level at which hearing protection is required in 85 decibels and the person's exposure should be limited only to six hours or less than of it.
