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3 years ago

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Which provides evidence of universe expansion that supports the Big Bang Theory? Select the three correct answers. (2 points)

1 answer:

baherus [9]3 years ago

3 0

The Big Bang Theory is a theory that describes the origin of the Universe. This theory was first proposed by the Belgian cosmologist G. Lemaitre in 1931.

The evidence of universe expansion that supports the Big Bang Theory is the observation that the temperature of the universe is decreasing.

According to this theory, the Universe is continuously expanding as it becomes cooler.

The most important lines of evidence that support the Big Bang Theory include:

The observed expansion of the space in the Universe.
The discovery of the cosmic microwave background radiation (CMB) is believed to be leftover radiation from the Big Bang.

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Read 2 more answers

A ball bearing of radius of 1.5 mm made of iron of density

Serjik [45]

Answer:

$\boxed{\sf Viscosity \ of \ glycerine \ (\eta) = 14.382 \ poise}$

Given:

Radius of ball bearing (r) = 1.5 mm = 0.15 cm

Density of iron (ρ) = 7.85 g/cm³

Density of glycerine (σ) = 1.25 g/cm³

Terminal velocity (v) = 2.25 cm/s

Acceleration due to gravity (g) = 980.6 cm/s²

To Find:

Viscosity of glycerine ( $\sf \eta$ )

Explanation:

$\boxed{ \bold{v = \frac{2}{9} \frac{( {r}^{2} ( \rho - \sigma)g)}{ \eta} }}$

$\sf \implies \eta = \frac{2}{9} \frac{( {r}^{2}( \rho - \sigma)g )}{v}$

Substituting values of r, ρ, σ, v & g in the equation:

$\sf \implies \eta = \frac{2}{9} \frac{( {(0.15)}^{2} \times (7.85 - 1.25) \times 980.6)}{2.25}$

$\sf \implies \eta = \frac{2}{9} \frac{(0.0225 \times 6.6 \times 980.6)}{2.25}$

$\sf \implies \eta = \frac{2}{9} \times \frac{145.6191}{2.25}$

$\sf \implies \eta = \frac{2}{9} \times 64.7196$

$\sf \implies \eta = 2 \times 7.191$

$\sf \implies \eta = 14.382 \: poise$

6 0

3 years ago