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3 years ago

Which graph accurately shows the relationship between kinetic energy and speed as speed increases?

Physics

1 answer:

mixer [17]3 years ago

3 0

Answer:

Explanation:

kinetic energy (KE) is the energy possessed by moving bodies. It can be expressed as:

KE = $\frac{1}{2}$ m $v^{2}$

Where: m is the mass of the object, and v its speed.

For example, a stone of mass 2kg was thrown and moves with a speed of 3 m/s. Determine the kinetic energy of the stone.

Thus,

KE = $\frac{1}{2}$ x 2 x $3^{2}$

= 9

KE = 9.0 Joules

Assume that the speed of the stone was 4 m/s, then its KE would be:

KE = $\frac{1}{2}$ x 2 x $4^{2}$

= 16

KE = 16.0 Joules

Therefore, it can be observed that as speed increases, the kinetic energy increases. Thus option B is appropriate.

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Answer:

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Explanation:

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3 years ago

5. What evidence best supports the claim that a

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2 years ago

A 43-kg child sits in a massless swing. With what horizontal force must the seat be pulled so that the ropes form an angle of 35

GenaCL600 [577]

Answer:

F_x = 295.4N

Explanation:

180°-90°-35°= 55°

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2 years ago

A 0.40-kg mass attached to the end of a string swings in a vertical circle having a radius of 1.8 m. At an instant when the stri

enyata [817]

Answer:

$T=8.1N$

Explanation:

From the question we are told that:

Mass m=0.40

Radius r=1.8m

Angle Beneath the Horizontal \theta =40 \textdegree

Speed v=5.0m/s

The Tension Angle

$\alpha=90-\theta\\\\\alpha=90-40$

$\alpha=50 \textdegree$

Generally the equation for Tension is is mathematically given by

$T=\frac{mv^2}{r}+mgcos \alpha$

$T=\frac{0.40*5^2}{1.8}+0.40*5cos50$

$T=8.1N$

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3 years ago

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geniusboy [140]

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Explanation:

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3 years ago