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3 years ago

12

Which of the following is created when the ice of a comet starts to melt into gases?

1 answer:

Dmitry_Shevchenko [17]3 years ago

6 0

The correct answer would be the last option. It is a plasma tail that is created when the ice of a comet start to melt into gases. As the comet is near to the sun, it melts containing dust, rock and ice that are in the gas phase. They are being ionized by the photons from the sun.

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One of the frequencies used to transmit and receive cellular telephone signals in the United States is 985 MHz. What is the wave

tia_tia [17]

Answer:

approximately 304358

Explanation:

wavelength = speed / frequency

speed of an electromagnetic wave is 299,792,458 m/s in a vacuum

5 0

2 years ago

Jacob is working on his physics portfolio and stands on a 0.45 m high step. If Jacob’s mass is 103 kg, what is his

Aleks [24]

$e_ p = m \times g \times h \\ \\ = 103kg \times 9.81 \frac{m}{s { }^{2} } \times 0.45m$

4 0

3 years ago

A spherical hot air balloon of diameter 30.0 meters just floats (hovers) when the hot air inside has been heated to a density of

Rom4ik [11]

Answer:

W = 166422.729 N

Explanation:

given,

diameter of the balloon = 30 m

density of the air = 1.10 Kg/m³

weight of the balloon and cargo = ?

density of the surrounding air = 1.20 kg/m³

we know,

Density = mass/volume

m = density x volume

$m = \rho\times \dfrac{4}{3}\pi r^3$

$m =1.20 \times \dfrac{4}{3}\pi\times 15^3$

m = 16964.6 Kg

Weight of the balloon

W = m g

W = 16964.6 x 9.81

W = 166422.729 N

Weight of the balloon and the cargo is equal to W = 166422.729 N

5 0

3 years ago

What would happen if there's a increase in greenhouse effect?

Furkat [3]

I guess the same effect as increased temperarure - ice melting, weather change, ecosystem change, crop agrculture, etc

5 0

3 years ago

Two harmonic waves traveling in opposite directions interfere to produce a standing wave described by y = 3 sin (2x) cos 5t wher

Nostrana [21]

Answer:

The wavelength of the interfering waves is 3.14 meters.

Explanation:

Given that,

The equation of standing wave that is formed by interfering two harmonic waves (travelling opposite direction) is given by :

$y=3\ sin(2x)\ cos(5t)$ ........(1)

The general equation of standing wave is given by :

$y=2A\ sin(kx)\ cos(\omega t)$ ..............(2)

On comparing equation (1) and (2), we get :

k = 2

We know that,

$\dfrac{2\pi}{\lambda}=k$

$\dfrac{2\pi}{\lambda}=2$

$\lambda=3.14\ m$

So, the wavelength of the interfering wave is 3.14 meters. Hence, this is the required solution.

8 0

3 years ago