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4 years ago

TIME REMAINING

Physics

2 answers:

kvasek [131]4 years ago

7 0

Answer:

The total energy in the system remains the same as the decrease in chemical energy equals the increase in thermal and radiant energy

Explanation:

rusak2 [61]4 years ago

4 0

Answer:

The total energy in the system remains the same as the decrease in chemical energy equals the increase in thermal and radiant energy

Explanation:

According to the law of conservation of energy, "energy cannot be created nor destroyed, but only transformed".

This means that for an isolated system, the total energy of the system must remain constant.

In this case, the total energy of the system (the battery and the lightbulb) is the sum of 3 components:

- Chemical energy of the battery

- Thermal energy (the heat produced by the light bulb)

- Radiant energy (the light emitted by the bulb)

The sum of these 3 components of energy must be constant.

At the beginning, all the energy is stored as chemical energy inside the battery. Later, this energy is converted into electrical energy first (when the current starts circulating through the circuit), and finally, this energy is entirely converted into thermal energy and radiant energy as heat and light emitted by the bulb.

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Which is hotter, Canopus or Vega? How much brighter?

marusya05 [52]

Temperature determines the hotness or coldness. The surface temperature of Canopus is 7350 K. The surface temperature of Vega is 9602 K. Because the surface temperature of Vega is greater than Canopus, Vega is hotter.

Brightness is determined by the star's magnitude. The apparent magnitude of Canopus is (-0.72) and that of Vega is (0.03). we know that, lesser the magnitude, brighter is the star. Hence, Canopus is brighter.

Vega is hotter but Canopus is brighter. This is because, brightness depends on the star's distance and size of the star as well other than the factor temperature.

4 0

4 years ago

Two Earth satellites, A and B, each of mass m = 940 kg , are launched into circular orbits around the Earth's center. Satellite

-Dominant- [34]

Answer:

The required work done is $6.5\times10^{9}\ J$

Explanation:

Given that,

Mass of each satellites = 940 kg

Altitude of A = 4500 km

Altitude of B = 11100 km

We need to calculate the potential energy

Using formula of potential

$U_{A}=-\dfrac{Gm_{A}m_{E}}{r_{A}}$

Put the value into the formula

$U_{A}=-\dfrac{6.67\times10^{-11}\times940\times5.98\times10^{24}}{6.38\times10^{6}+4.50\times10^{6}}$

$U_{A}=-3.44\times10^{10}\ J$

We need to calculate the potential energy

Using formula of potential

$U_{B}=-\dfrac{Gm_{B}m_{E}}{r_{A}}$

Put the value into the formula

$U_{B}=-\dfrac{6.67\times10^{-11}\times940\times5.98\times10^{24}}{6.38\times10^{6}+11.10\times10^{6}}$

$U_{B}=-2.14\times10^{10}\ J$

We need to calculate the value of $k_{A}$

Using formula of $k_{A}$

$k_{A}=-\dfrac{1}{2}U_{A}$

Put the value into the formula

$k_{A}=\dfrac{1}{2}\times3.44\times10^{10}$

$k_{A}=1.72\times10^{10}\ J$

We need to calculate the value of $k_{B}$

Using formula of $k_{B}$

$k_{B}=-\dfrac{1}{2}U_{B}$

Put the value into the formula

$k_{B}=\dfrac{1}{2}\times2.14\times10^{10}$

$k_{B}=1.07\times10^{10}\ J$

We need to calculate the work done

Using formula of work done

$W=\Delta K+\Delta U$

$W=(k_{B}-k_{A})+(U_{B}-U_{A})$

$W=(-\dfrac{U_{B}}{2}+\dfrac{U_{A}}{2})+(U_{B}-U_{A})$

$W=\dfrac{1}{2}(U_{B}-U_{A})$

Put the value into the formula

$W=\dfrac{1}{2}\times(-2.14\times10^{10}+3.44\times10^{10})$

$W=6.5\times10^{9}\ J$

Hence, The required work done is $6.5\times10^{9}\ J$

7 0

3 years ago

Where does the energy that is used to ride a bicycle up a hill come from and how is it classified?

MariettaO [177]

Well when you eat you get energy and then you use it to ride up the hill sorry I don't know how it is classified

7 0

4 years ago

Read 2 more answers

Kim holds a pinwheel in the air and says it can be used to model a source of energy. Identify the type of energy Kim's pinwheel

Natali5045456 [20]

Answer:

it is kenetic

Explanation: its in motion:D

7 0

4 years ago

What is the maximum number of electrons that can occupy each of the following subshells?

aleksandr82 [10.1K]

Answer:

s (l = 0) only two electrons

p (l = 1) sublevel six (6) electrons fit

d (l = 2) sub-level has 10 electrons

f (l = 3) has 7 has 14 electrons

Explanation:

The electrons have an odd spin, so they must comply with the Pauli principle, therefore only two electrons fit in a given sublevel.

Sub level s (l = 0) only two electrons

Sub level p (l = 1) has three orbitals in which two electrons fit, therefore in the sublevel six (6) electrons fit

Sub-level d (l = 2) has 5 orbitals each with two electrons, the sub-level has 10 electors

Sub-level f (l = 3) has 7 orbitals and two electrons each, the sub-level has 14 electrons

3 0

3 years ago

Read 2 more answers