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skelet666 [1.2K]
2 years ago
14

the kinetic energy of an object is equal to one half its mass multiplied by its speed what is the answer

Physics
1 answer:
jekas [21]2 years ago
5 0
False, it is equal to the square of the speed multiplied by the half of the mass.
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Calculate the kinetic energy of a moving 4 kg object traveling at a velocity of 3 m/a
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Answer:

Explanation:KE = 18 J

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2 years ago
A small dog is trained to jump straight up a distance of 1.2 m. How much kinetic energy does the 7.2-kg dog need to jump this hi
LUCKY_DIMON [66]
Answer:84.672 joules.

Explanation:

1) Data:

m = 7.2 kg
h = 1.2 m
g = 9.8 m / s²

2) Physical principle

Using the law of mechanical energy conservation principle, you have that the kinetic energy of the dog, when it jumps, must be equal to the final gravitational potential energy.

3) Calculations:

The gravitational potential energy, PE, is equal to m × g × h

So, PE = m × g × h = 7.2 kg × 9.8 m/s² × 1.2 m = 84.672 joules.

And that is the kinetic energy that the dog needs.
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3 years ago
the cross section area of a hole is 725cm^2. Given that the area of a circle is A=3.14r^2 , find the radius of the hole.
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The\ area\ of\ a\ circle\ =  \pi r^2 \\ 725\ cm^2 =  3.14r^2 \\
230.57 cm^2 = r^2 \\ \sqrt{230.57\ cm^2} = r \\ \boxed{r = 15.18\  cm}
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2 years ago
People have proposed driving motors with the earth's magnetic field. This is possible in principle, but the small field means th
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Answer:

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Explanation:

\tau = Torque = 1\times 10^{-3}\ N/m

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Current is given by

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Because even though the moon is smaller, therefore a weaker gravitational pull, the moon is much closer to the earth than the sun, thus having a greater gravitational pull
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2 years ago
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