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4 years ago

PLEASE HELP!! I NEED TO GO TO SLEEP!! WILL MARK BRAINLIEST TO THE PERSON WHO ANSWERS QUICKLY AND CORRECTLY! 15 POINTS!

Physics

2 answers:

Sedaia [141]4 years ago

7 0

I’m thinking it would be b

seropon [69]4 years ago

4 0

Answer:

B. The frequency increases (gets higher) as the wavelength size will decreases (get shorter).

Explanation:

Speed of Light = Wavelength times Frequency

c = λν

We know that wavelength and frequency are inversely proportional; if frequency increases, energy increases as well but wavelengths decrease.

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What are the methods of heat transfer?

m_a_m_a [10]

Answer:

Radiation , Conduction and Convection

Explanation:

Those are the ways heat is transferred

8 0

3 years ago

A particle of mass 2.37 kg is subject to a force that is always pointed towards East or West but whose magnitude changes sinusoi

Pavlova-9 [17]

Answer:

$v(1.5)=0.7648\ m/s$

Explanation:

Dynamics

When a particle of mass m is subject to a net force F, it moves at an acceleration given by

$\displaystyle a=\frac{F}{m}$

The particle has a mass of m=2.37 Kg and the force is horizontal with a variable magnitude given by

$F=2cos1.1t$

The variable acceleration is calculated by:

$\displaystyle a=\frac{F}{m}=\frac{2cos1.1t}{2.37}$

$a=0.8439cos1.1t$

The instant velocity is the integral of the acceleration:

$\displaystyle v(t)=\int_{t_o}^{t_1}a.dt$

$\displaystyle v(t)=\int_{0}^{1.5}0.8439cos1.1t.dt$

Integrating

$\displaystyle v(1.5)=0.7672sin1.1t \left |_0^{1.5}$

$\displaystyle v(1.5)=0.7672(sin1.1\cdot 1.5-sin1.1\cdot 0)$

$\boxed{v(1.5)=0.7648\ m/s}$

3 0

3 years ago

An astronaut lands on an alien planet. He places a pendulum (L = 0.200 m) on the surface and sets it in simple harmonic motion,

Ne4ueva [31]

A) f = 1.8 rev/s = 2 Hz
T = 1 / f = 0.55s

B) not really sure..srry

C) T = 2 pi √ ( L / g ) 
0.57 = 2 x 3.14 x √ ( 0.2 / g )

g = 25.5 m/s²

Hope this helps a little at least.. :)

5 0

3 years ago

HURRY!

arsen [322]

Answer:

changes direction

changes speed

bounces off the boundary

8 0

3 years ago

The multiple reflection of a single sound wave is a/an

ANTONII [103]

A single reflection, like shouting at the side of a mountain and hearing
your voice come back to you, is an 'echo'.

Multiple reflection, like clapping your hands once inside a large room,
is 'reverberation'.

8 0

3 years ago