Physics, 21.07.2019 17:00 martinbricein10

The earth takes one year to revolve around the sun at 1 a. u. distance (an astronomical unitv=93,000,000 miles) if a planet were 4 a. u. from the sun, how many years would it take to make 1 orbit? a) 8 b) 64

Answers: 1

Show answers

Answers

To solve this we are going to use Kepler's third law: $\frac{T_{1}^2}{T_{2}^2} = \frac{R_{1} ^3}{R_{2} ^3}$
where
$T_{1}$ is the period of revolution of the first object
$T_{2}$ is the period of revolution of the second object
$R_{1}$ is the distance from the sun to the first object
$R_{2}$ is the distance from the sun to the second object

We can infer that our first object is the Earth, Since it takes one year to revolve around the sun, its period of revolution is 1 year; therefore: $T_{1}=1$ . We also know that the distance from the Sun to the Earth is 1 AU, so $R_{1}=1$ .
Similarly, we can infer that our second object is the other planet. Since we know that the planet is 4 AU from the sun, $R_{2}=4$ .
Lets replace the values in our formula to find $T_{2}$ :

$\frac{T_{1}^2}{T_{2}^2} = \frac{R_{1} ^3}{R_{2} ^3}$
$\frac{1^2}{T_{2}^2 } = \frac{1^3}{4^3}$
$\frac{1}{T_{2}^2} = \frac{1}{64}$
$T_{2}^2=64$
$T_{2}= \sqrt{64}$
$T_{2}=8$

We can conclude that the period of revolution of the planted located 4 AU form the Sun is 8 years; therefore, the correct answer is A) 8.

Answer from: Quest

nec chapter 5 contains

c. information on special occupancy areas

nec chapter 6 covers

a. special equipment

which of the following rules contain the words shall or shall not and must be adhered to?

b. mandatory rules

which of the following rules identify actions that are allowed but not required and typically cover options or alternative methods?

c. optional rules

which of the following serves as the introduction to the nec and provides an overview of the book?

a. nec article 90

organizations that test products for safety are

c. nrtls

the nec is published by the

a national fire protection association

the nec is divided into

b. 9 chapters

the nec provides informative annexes for

c. informational materials and examples

two terms from nec article 100 that trainees should become familiar with are

b. labeled and listed

explanation:

Answer from: Quest

answer: the correct answer is 1.

explanation: there are various process in which a radioactive nuclei decays:

1) alpha decay: in this process, a heavier nuclei decays into lighter nuclei by releasing alpha particle. the mass number is reduced by 4 units.

$_a^z\textrm{x}\rightarrow _{a-2}^{z-4}+_2^4\alpha$

2) electron capture: in this decay process, a parent nuclei absorbs an electron and gets converted into a neutron. simply, a proton and an electron combines together to form a neutron. mass number does not change in this process.

$_a^z\textrm{x}+_{-1}^0\textrm{e}\rightarrow _{z-1}^a\textrm{y}$

3) gamma ray emission: it is a decay process in which an unstable nuclei gives excess energy by a spontaneous electromagnetic process. this decay releases $\gamma -radiations$ . this process does not change the mass number.

$_a^z\textrm{x}^*\rightarrow _a^z\textrm{x}+_0^0\gamma$

4) positron emission: it is a type of decay process, in which a proton gets converted to neutron and an electron neutrino. this is also known as $\beta ^+$ -decay. in this the mass number remains same.

$_a^z\textrm{x}\rightarrow _{z-1}^a\textrm{y}+_{+1}^0e$

from the above information, we see that only alpha-decay is producing a change in the mass number of the nucleus.

Another question on Physics

Physics, 21.06.2019 20:00

What statements accurately describe atoms

Answers: 1

Answer

Physics, 22.06.2019 10:30

Light from a sodium lamp passes through a diffraction grating that has 1000 slits per millimeter. the interference pattern is viewed on a screen 1.000 m behind the grating. the first (m = 1) two bright yellow fringes that are visible are 0.7288 m and 0.7300 m from the central maximum. what are the wavelengths of these two fringes?

Answers: 2

Answer

Physics, 22.06.2019 16:30

Atank has a shape of a cone with a radius at the top of 2 m and a height of 5 m. the tank also has a 1 m spout at the top of the tank. the tank is filled with water up to a height of 2 m. find the work needed to pump all the water out the top of the spout. (use 9.8 m/s2 for g and the fact that the density of water is 1000 kg/m3.)

Answers: 1

Answer

Physics, 22.06.2019 17:40

The first-order reaction a→2b+c has rate constant 0.538 s−1. if the initial concentration of a is 0.867 mol l−1, what is the half-life of the reaction in seconds? remember to use correct significant figures in your answer (round your answer to the nearest hundredth). do not include units in your response.

Answers: 3

Answer

You know the right answer?

The earth takes one year to revolve around the sun at 1 a. u. distance (an astronomical unitv=93,000...

Questions