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3 years ago

12

Energy resources that exist in limited amounts and, fonts used, cannot be replaced except over the course of millions of years a

re called _____________ energy resources.

1 answer:

kobusy [5.1K]3 years ago

5 0

Energy resources that cannot be replaced are called "non-renewable" energy resources.

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The diagram below shows four coastline locations on Earth with respect to the moon at a given time.

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4)Both B and D.This happens becaus3 at the ceryain time, A experiences a flood tide causing the waters to come near it.And since B and D are the closest coastlines they are affected the most.

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Can someone please help me to compare and contrast Gravitational force and Electromagnetic force?

Rashid [163]

Gravitational pulls an object closer together

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3 years ago

A 14300 kg airplane is flying at an altitude of 147 m at a speed of 214 m/s. determine the airplane's total mechanical energy.

kakasveta [241]

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Mechanical energy in Joules:

348,041,980

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3 years ago

A 2 kg toy car moves at a speed of 5 m/s. If a child applies a 5N force for 2 m in the same direction the car is already moving,

WITCHER [35]

Answer:

$10\: \mathrm{J}$

Explanation:

The kinetic energy of an object is $KE=\frac{1}{2}mv^2$ , where $m$ is the mass of the object and $v$ is the velocity of the object.

The toy car's initial kinetic energy is $KE_{i}=\frac{1}{2}\cdot 2\cdot 5^2=25\: \mathrm{J}$ .

After the child applies a 5N force on it in the same direction, its velocity will increase but its mass will stay the same.

To find the final velocity of the toy car, we can use kinematic equation $v_f^2=v_i^2+2a\Delta x, \\ v_f=\sqrt{v_i^2+2a\Delta x}$

We are given $v_i=5\: \mathrm{m/s}$ and $\Delta x = 2\: \mathrm{m}$ .

To find acceleration:

$F=ma, a=\frac{F}{m}=\frac{5}{2}=2.5\: \mathrm{m/s^2}$ .

Now substitute $v_i=5\: \mathrm{m/s}, \: a=2\: \mathrm{m/s^2}, \: \Delta x = 2\: \mathrm{m}$ into $v_f=\sqrt{v_i^2+2a\Delta x}$ to get $v_f\approx 5.92\: \mathrm{m/s}$ .

Using this, we can find the final kinetic energy of the toy car is $KE_f=\frac{1}{2}\cdot 2\cdot 5.92^2$ .

Thus, the change in kinetic energy is $KE_f-KE_i=\frac{1}{2}\cdot2\cdot 5.92^2-\frac{1}{2}\cdot 2\cdot 5^2=\fbox{$10\: \mathrm{J}$}$ (one significant figure).

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3 years ago

Emilio tries to jump to a nearby dock from a canoe that is floating in the water.Instead of landing on the dock, he falls into t

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The reaction of him pushing off a floating object pushes it away causing him to lose power and balance

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3 years ago