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3 years ago

Which is more common: a star blows up as a supernova, or a star forms a planetary nebula/white dwarf system?

1 answer:

6 0

A planetary nebula is more common to occur than a supernova. It actually is a nebula, meaning mist or cloud but was called planetary nebulae by others because it looked like a planet.

Supernova is a not a usual event to take place.

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Electric light was not widely available until the 1930s. True or false

Vlad1618 [11]

Answer:

false is the answer because it was around in the 1880's

Explanation:

I hope this helped

7 0

3 years ago

A capacitor consists of a set of two parallel plates of area a separated by a distance

MakcuM [25]

When a dielectric material is inserted between two plates of capacitor that are connected to a battery, you would observe that both the charge and the capacitance of the capacitor would change. This is due to the dielectric material which is able to transmit electric force.

8 0

3 years ago

A 240-kg merry-go-round in the shape of a uniform, solid, horizontal disk of radius 1.50 m is set in motion by wrapping a rope a

erastovalidia [21]

Explanation:

Below are attachments containing the solution.

8 0

3 years ago

A 0.05-m3 rigid tank initially contains refrigerant-134a at 0.8 MPa and 100 percent quality. The tank is connected by a valve to

lesya692 [45]

Answer:

A= 203 KJ

B= 54 Kg

Explanation:

The initial specific volumes and internal energies are obtained from A-12 for a given pressure and state. The enthalpy of the refrigerant in the supply line is determined using the saturated liquid approximation for the given temperature with data from A-11. The mass that has entered the tank is:

Δm = m₂ – m₁

= V(1/α₂ – 1/α₁)

= 0.05 (1/0.0008935 – 1/ 0.025645)Kg

= 54Kg

The heat transfer is obtained from the energy balance:

ΔU= $m_i_n$ $h_i_n$ + $Q_n_e_t$

m₂u₂ – m₁u₂ = $m_i_n$ $h_i_n$ + $Q_n_e_t$

$Q_n_e_t$ = m₂u₂ – m₁u₁ – $m_i_n$

= V/α₂u₂ - V/α₁u₁ – $m_i_n$

=(0.05/0.0008935 . 116.72 – 0.05/0.025645 . 246.82 – 54.108.28) Kj

= 203 KJ

8 0

3 years ago

A small child has a wagon with a mass of 10 kilograms. The child pulls on the wagon with a force of

Sholpan [36]

$F=ma$
where:
F - force
m - mass
a - acceleration

We transform this formula to get a:
$a= \frac{F}{m}$
$a=\frac{2}{10}\frac{N}{kg}=0.2\frac{m}{s^{2}}$

4 0

3 years ago

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