Answer:
120 dB
Explanation:
Softest audible sound with intensity, Is
Sound, I, which is 1,000,000,000,000 times as loud ;
I = 1,000,000,000,000 * Is
Loudness of the sound in decibels :
10 log base 10 (1,000,000,000,000 * Is / Is)
= 10 log base 10 (1,000,000,000,000)
= 10 (12)
= 120 decibels
human interference
Think of the hybrid lady bug..introduced to control insects on crops.
now they are reproducing rapidly, eating natural ladybugs, and other helpful insects..I haven't seen a red ladybug for years. in nw Illinois..
physical property and chemical properties are similarly because they both have to do with atoms and convey on the same platform
The angle between the red and blue light inside the glass is 1.9°.
Given that,
Refractive index
For blue = 1.64
For red = 1.54
Incident angle = 48°
We need to calculate the angle between the red and blue light inside the glass
Using Snell's law
For blue ray,
For red ray,
We need to calculate the angle between the red and blue
Put the value into the formula
Hence, The angle between the red and blue light inside the glass is 1.9°.
Answer
given,
mass of block (m₁)= 8 kg
mass of other block (m₂) = 5.75
velocity of first object (v₁) = 5.5 m/s
velocity of second object (v₂) = 6 m/s
a) total momentum before collision = total momentum after collision
m₂v₂ - m₁ v₁ = (m₁ + m₂) V
5.75 x 6 - 8 x 5.5 = (5.75 + 8 ) V
V = - 0.69 m/s
b) negative sign shows the direction motion of object after collision toward left.
c) Initial kinetic energy
K_i = 224.5 J
final kinetic energy
=
K_f = 3.23 J
loss in mechanical energy
Δ KE = 3.23 - 224.5
Δ KE = -218.1 J
negative sign shows loss of mechanical energy.