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3 years ago

What travels faster, light or sound?

2 answers:

5 0

Light.

Light is faster than sound . Because light doesn't need a medium to travel. The speed of sound through air is about 340 meters per second. It's faster through water and its even faster, through steel.

Allushta [10]3 years ago

4 0

Answer:

light travels faster than sound

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PLEASE HELP. I NEED THIS FOR TOMMOROW. WILL GIVE BRAINLIEST

Fantom [35]

Ansthethethethethe

the is the is

Explanation:

3 0

2 years ago

2.0 A are flowing through an electric motor. How long will it take for 40 Coulombs to flow through the motor?

Mandarinka [93]

Answer:

Answer: Magnitude = [____]; unit = [____].

Explanation:

4 0

3 years ago

A non-relativistic particle of mass m moves in one dimension x under the force

marin [14]

Answer:

U = - (x⁴ / 4 - b x² / 2) , c) The function is zero for x = 0 and √2

Explanation:

a and b) Strength and potential energy are related

F = - dU / dx

Therefore to find the energy we must integrate

∫ dU = -∫ F dx

∫ dU = - ∫ (a x³ –b x) dx

Let's make the integration

U = - (x⁴ / 4 - b x² / 2)

We evaluate the integral between the value

U - U₀ = -x⁴ / 4 + x² / 2 - (-x₀⁴ / 4 + x₀² / 2)

The arbitrary constant is zero, so that U is zero in the zero position

U₀ = 0 for x₀ = 0

c) Mechanical energy is the sum of kinetic energy plus potential energy

Em = K + U

Em = ½ m v² + ½ (x² -x⁴ / 2)

E = ½ m v² + ½ x² (1 - x² / 2)

Energy is positive

2 (E –K) = x² (1-x² / 2)

At the return points K = 0

The zero points of this function are

x = 0

(1- x² / 2) = 0

x² = 2

x = √ 2

The function is zero

x = 0 and √2

d) the movement is bounded for energy values less than or equal to

E <= ½ x² (1-x² / 2)

e) for this part we resolved Newton's second law

F = m a

ax³ - b x = m d²x / dt²

d²x / dt² = -b / m x + a / m x³3

The linear term gives a simple harmonic movement

w₀² = b / m

d²x / dt² = - w₀² x + a / m x³

The frequencies are the frequencies of the harmonic movement plus a small change due to the non-harmonic part of the movement

6 0

4 years ago

A thread holds two carts together on a frictionless surface. A spring is compressed

Goryan [66]

Answer:

Velocity on the right side of the cart $=0.09\ ms^{-1}$

Explanation:

Given

⇒The mass on the left of the cart $m_1=1.5\ kg$

Its velocity $v_1=27\ cm/s$ , $v_1=\frac{27}{100}=0.27\ m/s$

⇒Mass on the right of the cart $m_2=4.5\ kg$

Velocity $=?$ We have to find $v_2$

From

The law of conservation of linear momentum:

We can say that.

Initial momentum will equalize the final momentum.

And momentum is the product of mass and its velocity.

Assigning one of its velocity as negative because both are in different direction.

Lets call $v_1=-0.27m/s$

Recalling the formula and plugging the values.

$m_1(-v_1)+m_2v_2=0$

$v_2=-\frac{m_1(-v_1)}{m_2} =-\frac{1.5\times -0.27}{4.5} =0.09\ m/s$

So the velocity of the cart on the right side that has a mass of $4.5\ kg$ is $0.09\ ms^{-1}$

4 0

4 years ago

Ian has a mass of 58.0 killograms. What's his weight

BigorU [14]

I believe it would be 127.8 pounds. weight = mass x gravity

6 0

4 years ago

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