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Paraphin [41]
3 years ago
9

Think for a moment about an atom of the element lead (atomic number 82) inside the radio that you listen to in the morning. In w

hich of the following places has this atom probably NOT been during the course of its existence
a. a previous generation star
b. a supernova explosion
c. the Sun
d. a cloud of gas and dust which would clump to become a star and a family of planets
e. the Earth's crust
Physics
1 answer:
DiKsa [7]3 years ago
6 0

Answer:

c. the Sun

Explanation:

Considering the description made in the question about the atom of a lead with atomic number 82, the place t his atom probably have NOT been during the course of its existence is the SUN

The reason is that SUN is believed to consist of ten significant elements, which are: Hydrogen, Helium, Oxygen, Carbon, Nitrogen, Silicon, Magnesium, Neon, Iron, and Sulfur.

Also, some of the properties of lead show that it won't have existed in the Sun before. For example, it is a poor transmission of heat. Also, it doesn't react with oxygen in the air and doesn't burn as well.

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4 years ago
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How light is channelled down an optical fibre
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Explanation:

Suppose you want to shine a flashlight beam down a long, straight hallway. Just point the beam straight down the hallway -- light travels in straight lines, so it is no problem. What if the hallway has a bend in it? You could place a mirror at the bend to reflect the light beam around the corner. What if the hallway is very winding with multiple bends? You might line the walls with mirrors and angle the beam so that it bounces from side-to-side all along the hallway. This is exactly what happens in an optical fiber.

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3 0
3 years ago
A cart, which has a mass of m - 2.50 kg, is sitting at the top of an inclined plane which is 3.30 meters long and which meets th
SashulF [63]

Answer:

Part(i) the time taken for this cart to reach the bottom of the inclined plane is 1.457 s

Part(ii) the velocity of the cart when it reaches the bottom of the inclined plane is 4.531 m/s

Part(iii) the kinetic energy of the cart when it reaches the bottom of the inclined plane is 25.663 J

Explanation:

Given;

mass of the cart = 2.5 kg

angle of inclination, β = 18.5⁰

length of inclined plane = 3.3m

Part(i) the time taken for this cart to reach the bottom of the inclined plane

s = ut + ¹/₂×at²

initial vertical velocity, u = 0

s = 3.3 m

s =  ¹/₂×at²

t = \sqrt{\frac{2s}{a} }

acceleration, of the cart, a = gsinβ

a = 9.8sin(18.5) = 3.11 m/s²

t = \sqrt{\frac{2X3.3}{3.11 }}= 1.457 s

Part(ii) the velocity of the cart when it reaches the bottom of the inclined plane

V = a×t

V = 3.11 × 1.457 = 4.531 m/s

Part(iii) the kinetic energy of the cart when it reaches the bottom of the inclined plane

KE = ¹/₂MV²

    = ¹/₂ × 2.5× (4.531)²

    = 25.663 J

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Answer:

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The answer is realism.
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