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Sergeeva-Olga [200]
3 years ago
8

How much time will elapse between seeing and hearing an event?

Physics
1 answer:
julia-pushkina [17]3 years ago
3 0

Depends on how far away the event is and what the temperature is as this affects the speed of sound.

For example, let's say you're 600 meters away and the temperature has no affect.

The speed of sound would be roughly 340 m/s so the time it would take to hear the sound would be 600/340 = 1.76 seconds

The speed of light (c) is 3.0 X 10^8 m/s so the time it would take to see the event would be 600/3 X 10^8 = 2 X 10^-7

Subtract: 1.76 - (2 X 10^-7) = approx. 1.76

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A driver in a car speeding to the right at 24m/s suddenly hits the brakes and goes into a skid, finally coming to rest. The coef
irina [24]

Answer:

42 m

Explanation:

v_{o} = initial velocity of the car = 24 m/s

v_{f} = final velocity of the car = 0 m/s

μ = coefficient of kinetic friction = 0.7

g = acceleration due to gravity = 9.8 m/s²

a = acceleration due to kinetic frictional force  = - μg = - (0.7)(9.8) = - 6.86 m/s²

d = distance through which the car skids

Using the kinematics equation

v_{f}^{2} = v_{o}^{2} + 2 a d

Inserting the values

0^{2} = 24^{2} + 2 (- 6.86) d

d = 42 m

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3 years ago
Jaipal measures a circuit at 1.2 A and 24 . Using Ohm’s law, what can he calculate for the circuit? current (C) current (I) volt
jenyasd209 [6]

Answer: voltage (V)

Explanation:

Hi, in the answer the letter A (1.2 A) stands for Ampere, and the symbol next to the number 24 must be Ω 8 (Ohms)

So, applying Ohm's law:

Voltage (V) =current (I) x resistance (R)

V = I x R

Replacing with the values given;

V = 1.2 A x 24Ω

In conclusion, we can calculate the value of Voltage for the circuit.

Feel free to ask for more if needed or if you did not understand something.

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mel-nik [20]

Answer:

"we both attract each other with the same force but we know that attraction between two bodies depends upon their mass, greater the mass of two bodies is the force of attraction between them"(got this off the internet).

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An electromagnetic wave is traveling through vacuum in the positive x direction. Its electric field vector is given by E⃗ =E0sin
fgiga [73]

Given that,

The electric field is given by,

\vec{E}=E_{0}\sin(kx-\omega t)\hat{j}

Suppose, B is the amplitude of magnetic field vector.

We need to find the complete expression for the magnetic field vector of the wave

Using formula of magnetic field

Direction of (\vec{E}\times\vec{B}) vector is the direction of propagation of the wave .

Direction of magnetic field = \hat{j}

B=B_{0}\sin(kx-\omega t)\hat{k}

We need to calculate the poynting vector

Using formula of poynting

\vec{S}=\dfrac{E\times B}{\mu_{0}}

Put the value into the formula

\vec{S}=\dfrac{E_{0}\sin(kx-\omega t)\hat{j}\timesB_{0}\sin(kx-\omega t)\hat{k}}{\mu_{0}}

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Hence, The poynting vector is \dfrac{E_{0}B_{0}}{\mu_{0}}(\sin^2(kx-\omega t))\hat{i}

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