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USPshnik [31]
3 years ago
15

Why is the Big Bang a theory and not a fact

Physics
2 answers:
Ludmilka [50]3 years ago
7 0
Because it has not been proven. We have no evidence that the big bang happened. 
choli [55]3 years ago
7 0
Because we do not yet have enough proof. The Big Bang (theoretically) happened over 10 billion years ago, and as of now we are not sure of what really happened, but we can be quite sure.
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3 A 100 g steel ball falls from a height of 1.8 m on to a metal plate and rebounds to a height of 1.25 m.​
BigorU [14]

Given values:

Mass of the steel ball, m = 100 g = 0.1 kg

Height of the steel ball, h1 = 1.8 m

Rebound height, h2 = 1.25 m

a.  PE= mgh

0.1 x 9.8 x 1.8 =

1.764 Joules

b. KE = PE ->

1.764 Joules

c. KE= 1/2 mv square

so v = square root 2ke/m

square root 2 x 1.764/ 0.1

= 5.93 m/s

d. KE=PE=mgh square

0.1 x 9.8 x 1.21 =

1.186 joules

velocity of rebond is square root 2x 1.186/ 0.1 = 4.87 m/s

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3 years ago
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disa [49]

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Answer:

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How much energy is needed to change 100 g of 0o C ice to 0o C water? The latent heat of fusion for water L=335,000 J/kg. Hint: T
pychu [463]

Answer:

33.5 kJ

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we have ice 100g =0.1 kg

Appplying Q=mL

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