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WINSTONCH [101]
3 years ago
11

What has more kinetic energy 15 kg ball rolling north at 15 m/s or a 15 kg ball rolling backwards at 7m/s

Physics
1 answer:
Setler79 [48]3 years ago
6 0

Answer:

15 kg ball

Explanation:

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According to my assumptions,the answer closest to the perfection is :

c. they show royalty instead of peasants.
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You are cycling along a flat road.<br> What is the force that is pulling you downwards?
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A 3.00-kg rifle fires a 0.00500-kg bullet at a speed of 300 m/s. Which force is greater in magnitude:(i) the force that the rifl
alekssr [168]

Answer:

C. both forces have the same magnitude

Explanation:

Here the action force is equal to the reaction force in accordance with the Newton's third law of motion.

Also when we apply the conservation of momentum so that the momentum bullet and the momentum of the gun are equal and according to the second law of motion by Newton, we have force equal to the rate of change in momentum.

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F=\frac{dp}{dt}

Momentum is constant and the reaction time is equal, so the force exerted will also be equal.

7 0
3 years ago
A person can see clearly up close but cannot focus on objects beyond 75.0 cm. She opts for contact lenses to correct her vision.
Pavel [41]

Answer:

(a) nearsighted

(b) diverging

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Explanation:

(a) The person is nearsighted because he/she cannot see objects at distances larger than 75 cm.

(b) the type of correcting lens has to be such that it counteracts the excessive converging power of the eye of the person, so the lens has to be diverging (which by the way carries by convention a negative focal length)

(c) the absolute value of the focal length (f) is given by the formula:

f=\frac{1}{d} =\frac{1}{0.75} = 1.33\,D

So it would normally be written with a negative signs in front indicating a divergent lens.

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