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3 years ago

19) Suppose that a car traveling to the east (+x direction) begins to slow down as it approaches a traffic

Physics

1 answer:

k0ka [10]3 years ago

6 0

Answer: C) Its acceleration is decreasing in magnitude as the car slows down.

Explanation:

According to the described situation the car's final velocity is less than its initial velocity, this means the car's velocity decreased as it slows down.

On the other hand, acceleration $a$ is defined as the variation of velocity in time:

$a=\frac{\Delta V}{\Delta t}$

If the car's velocity decreases, its acceleration is negative. Hence, the acceleration is decreasing in magnitude as well.

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What property is primarily responsible for determining the type of electromagnetic energy and peak wavelength emitted by a star

Galina-37 [17]

Answer:B. Temperature

Explanation:The temperature of the star such as Sun is measured. Using this measurement, its peak wavelength and energy can be determined.For determination of wavelength, Wien's displacement law is used. This law states that, the sun like body emits all kinds of wavelengths and thus is nearly a black body.For black body, the peak wavelength emitted is inversely proportional to the temperature of the body. From the wavelength, energy can be calculated.Temperature is the property which is primarily responsible for determining the type of electromagnetic energy and peak wavelength emitted by star.

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3 years ago

An object falling from a great height in Earth's atmosphere eventually reaches a speed called Terminal velocity. What cause a fa

Julli [10]

Answer:

Explanation:

If its at a height the Gratitude of it falling down with only Gravity if Any other Forces are acting on it so as Friction But Sideways.

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3 years ago

If dye x has a molar absorptivity, ε = 4.50 x 104 cm-1 m-1, at a certain wavelength, what concentration of the dye, in a 1.00 cm

NeTakaya

For this problem, the working equation should be used from the Beer's Law:

A = ∈lc,
where
A is the absorbance
∈ is the molar absorptivity
l is the length of path of the cuvette diameter
C is the concentration of the sample placed inside the cuvette

Substituting the values:

0.417 = (4.50×10⁴ cm⁻¹ M⁻¹)(1 cm)(C)
Solving for C:
C = 9.27×10⁻⁶ M

8 0

4 years ago

A stereo speaker is placed between two observers who are 35 m apart, along the line connecting them. If one observer records an

kompoz [17]

Answer:

x = 2,864 m , Ra = 32.1 m

Explanation:

Let's solve this problem in parts, let's start by finding the intensity of the sound in each observer

observer A β = 64 db

β = 10 log Iₐ / I₀

where I₀ = 1 10⁻¹² W / m²

Iₐ = I₀ 10 (β/ 10)

let's calculate

Iₐ = 1 10⁻¹² (64/10)

Iₐ = 2.51 10⁻⁶ W / m²

Observer B β = 85 db

I_b = 1 10-12 10 (85/10)

I_b = 3.16 10⁻⁴ W / m²

now we use that the emitted power that is constant is the intensity over the area of the sphere where the sound is distributed

P = I A

therefore for the two observers

P = Ia Aa = Ib Ab

the area of a sphere is

A = 4π R²

we substitute

Ia 4pi Ra2 = Ib 4pi Rb2

Ia Ra2 = Ib Rb2

Let us call the distance from the observer be to the haughty R = ax, so the distance from the observer A to the haughty is R = 35 ax; we substitute

Ia (35 -x) 2 = Ib x2

we develop and solve

35-x = Ra (Ib / Ia) x

35 = [Ra (Ib / Ia) +1] x

x (11.22 +1) = 35

x = 35 / 12.22

x = 2,864 m

This is the distance of observer B

The distance from observer A

Ra = 35 - x

Ra = 35 - 2,864

Ra = 32.1 m

8 0

3 years ago

How many atoms are in Cu3(PO4)2

anastassius [24]

The answer is 24 atoms

5 0

3 years ago

Read 2 more answers