Answer:
Explanation:
A lot of physicist and many cosmologist believe by their research works on quantum fluctuation that it is possible for the universe to be created out of nothing. They believe and has almost proved that particle comes in and out of existence from empty space. This idea led them believe that big bang singularity also came out of nothing (hyperspace) by quantum fluctuation creating positive and negative energy of equal amount. Thus conserving law of energy. In this scenario, positive energy is matter and negative energy is gravity so total energy of universe/big bang singularity is zero. Therefore, it is plausible for our universe to come out of nothing on its own. But why universe came into existence it's own confirming the idea of 'why there is something rather than nothing' as Lawrence Maxwell Krauss hypothesized could be correct.
Answer:
Volume of head = 1000 cm^3
Explanation:
The head of a normal person can be assumed as a sphere with radius 10 cm.
Volume of sphere
, where r is the radius.
We have approximate radius = 10 cm.
Approximate volume of head 
In the given options the closest value to the approximate volume is 1000 cm^3.
So, volume of head = 1000 cm^3
Specific heat. The definition of specific heat is the amount of energy required to raise the temperature of 1g of a substance by 1K or 1°C.
Answer:mechanical waves.
Explanation:
Mechanical waves require the particles of the medium to vibrate in order for energy to be transferred. For example, water waves, earthquake/seismic waves, sound waves, and the waves that travel down a rope or spring are also mechanical waves.
24-15=9 m/s slower in 12 seconds. So 9/12 m/s² slower. Therefore the acceleration is -0,75 m/s²
