What is the wavelength of the waves you create in a swimming pool if you splash your hand at a rate of 2.00 Hz and the waves pro
1 answer:
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Answer:
Average velocity = 1.69 m/s
Average speed = 5.09 m/s
Explanation:
Given that
Horse cover 37 m in 9.1 sec and 18.5 m in 1.8 sec.
As we know that
Average velocity = Displacement / Total time
Average speed = Total distance / Total time
Average velocity:
Average velocity = Displacement / Total time
Total displacement = 37 - 18.5 = 18.5 m
Total time = 9.1 + 1.8 =10.9 s
Average velocity = Displacement / Total time
Average velocity = 18.5 / 10.9
Average velocity = 1.69 m/s
Average speed:
Average speed = Total distance/ Total time
Total distance = 37 + 18.5 = 55.5 m
Total time = 9.1 + 1.8 =10.9 s
Average speed = Total distance/ Total time
Average speed = 55.5 / 10.9
Average speed = 5.09 m/s
Answer: option A. Reduce the distance by a factor of 4.
Explanation:
1) The electric potential energy, U is given by the formula
<h2>
Where U is the electric potential energy, Q and q are the magnitude of the charges, and r is the distance between the charges.
2) That means that the electric potential energy is directly proportional to the product of the charges and inversely proportional to the distance between the two charges.
3) Therefore, withoud modifying the charges, when you reduce the distance, r, by a factor, the electric potential energy will be increased by the same factor.
Mathematically you can prove that in this way:
<h2>U₁ = KQq / r₁</h2>
<h2>U₂ = KQq / r₂</h2>
<h2>U₂ = 4 U₁ ⇒ </h2><h2 /><h2>KQq / r₂ = 4 KQq / r₁ ⇒ 1 / r₂ = 4 / r₁ ⇒ r₂ = r₁ / 4.</h2>
Which is that the distance is reduced by a factor of 4.