1. B
2. A
3. B
4. C
5. heterogeneous
6. element
7. do
8. true
9. true
10. true
Answer:
Stars become the main sequence as they move through a galaxy. During this stage, it will fuse hydrogen atoms and form helium molecules in its core for 90 percent of its life. We are currently in the main sequence of our sun's life cycle.
Explanation:
Answer:
The final kinetic energy is four times of initial kinetic energy when speed of the car doubles.
= 4 
Explanation:
Mass of the car = 770 kg
initial speed
= 23.1 
Final speed
= 46.2 
Initial kinetic energy
= 
⇒
= 0.5 × 770 × 
⇒
= 205440 J
Final kinetic energy
= 
⇒
= 0.5× 770 × 
⇒
= 821760 J
Thus
= 4 
Therefore the final kinetic energy is four times of initial kinetic energy when speed of the car doubles.
Answer:
Explanation:
27dB = 2.7 B
So I / I₀ = 10⁻²°⁷ , I₀ is intensity of main sound and I is intensity after reduction.
= 1.99 X 10⁻³
So intensity will reduce by 1.99 X 10⁻³ .