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3 years ago

What is the definition of evolution

2 answers:

7 0

<span>the process by which different kinds of living organisms are thought to have developed and diversified from earlier forms during the history of the earth.

Hope this helps.

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Hoochie [10]3 years ago

5 0

Evolution: The process by which different kinds of living organisms are thought to have developed and diversified from earlier forms during the history of the earth.

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If a wave is traveling at a constant speed, and the frequency increases, what would happen to the wavelength?

dsp73

Answer:

It would decrease.

Explanation:

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4 years ago

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Four long parallel wires each carry 2.0 A in the same direction. They are parallel to the z-axis, and they pass through the corn

yarga [219]

Answer:

Explanation:

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3 years ago

What type of machine would most likely be used to move buckets of the mineral pieces up to the surface of the Earth? a wedge a p

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The type of machine would be a pulley.

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3 years ago

A girl coasts down a hill on a sled, reaching level ground at the bottom with a speed of 7.1 m/s. The coefficient of kinetic fri

Lelu [443]

Answer:

114.19186 m

Explanation:

v = Velocity of girl at bottom = 7.1 m/s

$\mu$ = Coefficient of kinetic friction = 0.045

g = Acceleration due to gravity = 9.81 m/s²

d = Distance

N = Normal force = 783 N

The weight of the sled and girl is considered as the sum of the frictional force and weight

Hence we use the following equation where the kinetic energy and potential energy are conserved

$\frac{1}{2}mv^2=\mu Nd\\\Rightarrow \frac{1}{2}\frac{783}{9.81}\times 7.1^2=0.045\times 783\times d\\\Rightarrow d=\frac{1}{2}\times \frac{783\times 7.1^2}{9.81\times 0.045\times 783}\\\Rightarrow d=114.19186\ m$

The sled travels 114.19186 m on the level ground before coming to a rest

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3 years ago

A rope is tied to a box and used to pull the box 2.3 m along a horizontal floor. The rope makes an angle of 30∘ with the horizon

Savatey [412]

Answer:

Answered

Explanation:

A) The work done by gravity is zero because displacement and the gravitational force are perpendicular to each other.

W= FS cosθ

θ= 90 ⇒cos90 = 0 ⇒W= 0

B) work done by tension

W= Tcosθ×S= 5cos30×2.30= 10J

C) Work done by friction force

W= f×s=1×2.30= 2.30 J

D) Work done by normal force is Zero because the displacement and the normal force are perpendicular to each other.

E) The net work done= Work done by tension in the rope - frictional work

=10-2.30= 7.7 J

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3 years ago