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Brums [2.3K]
3 years ago
9

Q7: A 4 kg toy is lifted off the ground and falls at 3 m/s. What is the toy's energy?

Physics
1 answer:
alexandr1967 [171]3 years ago
7 0

Answer:

The toy's energy is 18 J.

Explanation:

We have, a 4 kg toy is lifted off the ground and falls at 3 m/s. It is required to find toy's energy.

The toy will have kinetic energy due to its motion. The energy is given by :

E=\dfrac{1}{2}mv^2\\\\E=\dfrac{1}{2}\times 4\times 3^2\\\\E=18\ J

So, the toy's energy is 18 J.

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The kinetic energy of an object with a mass of 6.8 kg and a velocity of 5.0 m/s is J. (Report the answer to two significant figu
abruzzese [7]

Answer:

\boxed{\sf Kinetic \ energy \ (KE) = 85 \ J}

Given:

Mass (m) = 6.8 kg

Speed (v) = 5.0 m/s

To Find:

Kinetic energy (KE)

Explanation:

Formula:

\boxed{ \bold{\sf KE =  \frac{1}{2} m {v}^{2} }}

Substituting values of m & v in the equation:

\sf \implies KE =  \frac{1}{2}  \times 6.8 \times  {5}^{2}

\sf \implies KE = \frac{1}{ \cancel{2}}  \times  \cancel{2} \times 3.4 \times 25

\sf \implies KE =3.4 \times 25

\sf \implies KE = 85 \: J

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Maggie completed a 10000-m race at an average speed of 160
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Explanation:

Divide 10000m by 160m/min, you will get the answer 62.5. You then subtract 12.5 from 62.5 to understand what you will need your answer for the other person’s speed will be. 10000m divided by 50min is 200m/min.

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A 5 kg rock falls from an 8 m high cliff. What is the speed of the rock when it hits the ground?
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Consider a sphere and a cylinder of equal volume made of copper. Both the sphere and the cylinder are initially at the same temp
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Answer: The cylinder

Explanation:

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By experiment, the ratio of the radius of a sphere to a cylinder of equal volume is less than 1.

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As such, since the sphere has a smaller surface area relative to the cylinder, the sphere transfers heat slower than the cylinder.

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PS; the more the Area, the higher the rate of heat transfer and vice versa.

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