3 years ago

Which of these toy trains has the slowest speed?

Physics

1 answer:

Paraphin [41]3 years ago

5 0

B) toy train 3 travels 100 cm in 30 seconds

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the kinetic energy of an object with mass m moving with a velocity of 5 m/s is 25 j what will be its kinetic energy when its vel

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Answer:

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Explanation:

The kinetic energy of an object is given by:

$K=\frac{1}{2}mv^2$

where

m is the mass of the object

v is the velocity of the object

In this problem, the initial kinetic energy of the object is

K = 25 J

Then, the velocity is doubled, which means

v' = 2v

Therefore, the new kinetic energy will be

$K'=\frac{1}{2}m(2v)^2 = 4(\frac{1}{2}mv^2)=4K$

Therefore, the kinetic energy has quadrupled:

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Later, the velocity is tripled, which means

v'' = 3v

Therefore, the new kinetic energy will be

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Therefore, the kinetic energy has increased by a factor of 9:

$K' = 9(25)=225 J$

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3 years ago

A circuit contains two resistors in series. The voltage drop across the first is 10 V. The voltage drop across the second is als

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Hi there!

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