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3 years ago

Could anyone help with question 7?

Physics

2 answers:

PIT_PIT [208]3 years ago

4 0

The only answer that can justify being a hypothesis is C.

Tresset [83]3 years ago

3 0

I think the answer would be c- crickets chirp more frequently as temperature increases

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A fast moving vehicle travelling at a speed of 25.4 m/s comes up behind another vehicle which is

ale4655 [162]

Answer:

a = 6.1 m / s²

Explanation:

For this kinematics exercise, to solve the exercise we must set a reference system, we place it in the initial position of the fastest vehicle

Let's find the relative initial velocity of the two vehicles

v₀ = v₀₂ - v₀₁

v₀ = 25.4 - 13.6

v₀ = 11.8 m / s

the fastest vehicle

x = v₀ t + ½ a t²

The faster vehicle has an initial speed relative to the slower vehicle, therefore it is as if the slower vehicle were stopped, so the distance that must be traveled in a fast vehicle to reach this position is

x = 11.4 m

let's use the expression

v² = v₀² - 2 a x

how the vehicle stops v = 0

a = v₀² / 2x

a = $\frac{11.8^2}{2 \ 11.4}$

a = 6.1 m / s²

this velocity is directed to the left

8 0

3 years ago

An electron in a hydrogen atom jumps from the n = 3 state to the ground state. Which of the following statements can you deduce

anyanavicka [17]

Answer:

B) True. It is the photon is emitted the wavelength is correct

Explanation:

For this exercise let's use the Bohr model for the hydrogen atom

Eₙ = -13.606 / n2

This gives the energy of the levels in eV. let's look for the energy

n = 1

E₁ = -13,606

n = 3

E₃ = -13.606 / 3²

E₃ = -1.512 eV

The transition occurs when moving from one level to another

ΔE = E₃ -E₁

ΔE = -1.512 + 13.606

ΔE = 12.094 eV

Now let's use the Planck equation and the speed of light for the energy of the transition

E = h F

c = λ f

E = h c / λ

E = 6.63 10⁻³⁴ 3 10⁸ / λ

E = 19.89 10⁻²⁶ /λ

λ = 19.89 10⁻²⁶ / E

Let's reduce energy to July

E = 12,094 eV (1.6 10⁻¹⁹ J / 1 eV) = 19.35 10⁻¹⁹ J

λ = 19.89 10⁻²⁶ / 19.35 10⁻¹⁹

λ = 1.0279 10⁻⁷ m

Let's reduce to nm

λ = 1.0279 10⁻⁷ m (10⁹ nm / 1 m)

λ = 102.79 nm

Let's examine the answers

A) False is another wavelength and the photon emitted

B) True. It is the photon is emitted the wavelength is correct

C) False. Wavelength is different

D) False the photon is emitted

E) False wavelength is different

7 0

4 years ago

Toowwy umy compiere semences,

andrew11 [14]

Idkbjkhfvhkl glgffkkrfkfkfk Goff

6 0

3 years ago

How do positive and negative acceleration differ?

Greeley [361]

Answer:

1. positive acceleration represents an object speeding up; negative acceleration represents an object slowing down

Explanation:

Acceleration is clearly defined as the rate of change of velocity with time. When are body is speeding up as we say, it is accelerating. When a body is coming to rest, it is decelerating.

Positive acceleration occurs when the speed of a moving continues to increase.

Negative acceleration is when the speed of a moving body reduces drastically.

4 0

3 years ago

What minimum heat is needed to bring 150 g of water at 20 ∘c to the boiling point and completely boil it away? the specific heat

AnnZ [28]

Try this solution:

if given m=0.15 kg; t₁=20 °C; t₂=100 °C; c=4190 J/(kg*C); q=226*10⁴ J/kg., then

Q=Q₁+Q₂,

where Q₁=cm(t₂-t₁) and Q₂=q*m.

Finally,

Q=cm(t₂-t₁)+qm;

Q=4190*0.15*80+2240000*0.15=386280 J=<u>386.28 kJ</u>.

4 0

4 years ago