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3 years ago

A car starting from rest accelerates uniformly at 3

Physics

1 answer:

kondor19780726 [428]3 years ago

6 0

Answer:

From second newton's equation of motion:

$S = ut + \frac{1}{2} a {t}^{2}$

s » displacement or distance

u » initial speed, u = 0 ( at rest )

a » acceleration

t » time

$s = (0 \times 10) + ( \frac{1}{2} \times 3 \times 10) \\ \\ s = 5 \times 3 \\ \\ { \underline{ \underline{ \: \: distance = 15 \: meters}}}$

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when a sound's intensity increases by a factor of 10, its decibel reading increases by how many decibels?

Anit [1.1K]

Answer:

If sound intensity increases by a factor of 10, the decibel reading increases by 10.

Explanation:

Decibel scale:

In order to express levels of sound meaningfully in numbers that are more manageable, a logarithmic scale is used, rather than a linear one. This scale is the decibel scale. every increase of 3 dB represents a doubling of sound intensity.

Increase in decibel scale is given by the formula:

n = 10*log(Increased Intensity of sound/Original Intensity of Sound

n = 10*log(I/I₀)

In our case the sound intensity increases by a factor of 10. So I/I₀ increased by 10 times and will be 10 I/I₀

n = 10*log(10 I/I₀)

n = 10*log(10) + 10log(I/I₀)

n = 10 + 10*log(I/I₀)

This shows that the decibel reading is increased by 10 points.

8 0

3 years ago

Read 2 more answers

Compare the percent change in angular momentum of the system to the percent change in the rotational kinetic energy of the syste

Lapatulllka [165]

Answer:

change in the angular momentum gives a greater change in the kinetic energy since it has a quadratic dependence with the angular velocity

Explanation:

Let's write the definition of angular momentum

L = I w

the kinetic energy is

K = ½ I w²

w = L / I

we substitute

K = ½ I L² / I²

K = L² / 2I

K / L = w / 2

therefore a change in the angular momentum gives a greater change in the kinetic energy since it has a quadratic dependence with the angular velocity

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3 years ago

Two rigid rods are oriented parallel to each other and to the ground. The rods carry the same current in the same direction. The

IRISSAK [1]

To develop this problem we will apply the concepts related to the Electromagnetic Force. The magnetic force can be defined as the product between the free space constant, the current (of each cable) and the length of these, on the perimeter of the cross section, in this case circular. Mathematically it can be expressed as,

$F= \frac{\mu_0}{2\pi} \frac{I^2L}{d}$