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Luden [163]
3 years ago
6

One light-year is the distance light travels in one year. This distance is equal to 9.461 1015 m. After the sun, the star neares

t to Earth is Alpha Centauri, which is about 4.35 light-years from Earth. Express this distance in a. megameters. b. picometers.
Physics
1 answer:
Oliga [24]3 years ago
4 0

Answer:

A.) 411.6 Mega metres

B.) 411.6 × 10^18 Picometers

Explanation:

Given that One light-year is the distance light travels in one year. This distance is equal to 9461 1015 m.

After the sun, the star nearest to Earth is Alpha Centauri, which is about 4.35 light-years from Earth.

The distance travelled will be

Distance = 9461 1015 × 4.35

Distance = 411557915.3 m

To Express this distance in

a. megameters, divide the value by 1000000

411557915.3 / 1000000

411.5579153 Mega metre

411.6 Mega metres approximately

b. picometers, multiply by 10^12

That is, 411557915.3 × 10^12

411.6 × 10^18 Picometers

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1. A perspex box has a 10 cm square base and contains water to a height of 10 cm. A piece of rock of mass 600g is lowered into t
AnnZ [28]

Answer:

(a) The volume of water is 100 cm³

(b) The volume of the rock is 20 cm³

(c) The density of the rock is 30 g/cm³

Explanation:

The given parameters of the perspex box are;

The area of the base of the box, A = 10 cm²

The initial level of water in the box, h₁ = 10 cm

The mass of the rock placed in the box, m = 600 g

The final level of water in the box, h₂ = 12 cm

(a) The volume of water in the box, 'V', is given as follows;

V = A × h₁

∴ The volume of water in the box, V = 10 cm² × 10 cm = 100 cm³

The volume of water in the box, V = 100 cm³

(b) When the rock is placed in the box the total volume, V_T, is given by the sum of the rock, V_r, and the  water, V, is given as follows;

V_T = V_r + V

V_T = A × h₂

∴ V_T = 10 cm² × 12 cm = 120 cm³

The total volume, V_T = 120 cm³

The volume of the rock, V_r = V_T - V

∴ V_r = 120 cm³ - 100 cm³ = 20 cm³

The volume of the rock, V_r = 20 cm³

(c) The density of the rock, ρ = (Mass of the rock, m)/(The volume of the rock)

∴ The density of the rock, ρ = 600 g/(20 cm³) = 30 g/cm³

8 0
3 years ago
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