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o-na [289]
3 years ago
14

How many of these statements regarding populations are true? 1. Mature males and females of a population can interbreed with eac

h other. 2. Populations are sometimes geographically isolated from other populations. 3. Biological species are made up of populations. 4. Members of a population tend to be genetically more similar to each other than to members of other populations. 5. Populations have genomes, but not gene pools.
Social Studies
1 answer:
Stolb23 [73]3 years ago
8 0

Answer:

1.true

2.true

3.true

4.true

5.false

Explanation:

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a casting with a mass of 500 kg rests on a surface witha a slope of 20° to the horizontal. The coefficient of friction is 0,25​
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Complete question:

A casting with a mass of 500 kg rests on a surface with a slope of 20° to the horizontal. The coefficient of friction is 0.25​.

Calculate;

(a) the component of the weight of the object perpendicular to the surface

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Answer:

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Explanation:

Given;

mass of the casting, m = 500 kg

angle of inclination of the casting, θ = 20⁰

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(a) the component of the weight of the object perpendicular to the surface;

F⊥ = mgcosθ

F⊥ = 500 x 9.8 x cos20

F⊥ = 4,604.5 N

(b) the component of the weight of the object parallel to the surface

F|| = mgsinθ

F|| = 500 x 9.8 x sin(20)

F|| = 1,675.9 N

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