How fast are they moving from each other

Assignment Help Physics

Reference no: EM131053914

Choose a best option from the list to answer each question. Mark the choice dark on the Scantron form using number 2 pencil. I will use Scantron to grade your responses. Make the marks visible to the machine.

1. The horizon system is a system is a coordinate system of locating an object on the sky. What is the value of azimuth of the East on the celestial horizon?

a) 0 degree.
b) 90 degree.
c) 180 degree.
d) 270 degree.

2. You see a moon slightly larger than half of it is bright in an afternoon. What is the most likely phase of the moon?

a) Full moon.
b) Waxing gibbous.
c) Waning gibbous.
d) Moon is not visible in afternoon.

3. What is the approximate distance of an object that has an angular diameter of 0.80 minutes of arc and a linear diameter of 96 meters?

a) 410 km
b) 206 km
c) 2 km
d) 24800 km

4. The celestial coordinates of stars change with time because of

a) Earth's spin.
b) Earth's revolution.
c) Precession of Earth's north pole.
d) Expansion of the universe.

5. An imaginary line connecting the planet to the Sun sweeps out equal area in equal intervals in time. This statement comes from

a) Aristotle's theory.
b) Kepler's first law.
c) Kepler's second law.
d) Kepler's third law.

6. What is the sidereal period of a of a hypothetical planet with an orbital semimajor axis of 4 AU?

a) 64 days
b) 64 years
c) 8 days
d) 8 years

7. Let's suppose you went to the top of leaning tower of Pisa and dropped three solid balls at the same instant. They are made of plastic, wood and steel and have same diameters. In the negligible air resistance which ball would reach the ground first?

a) Steel
b) Rubber
c) Wood
d) All of them at the same time.

8. How would the momentum of an object change if its mass remained same but its velocity doubled?

a) Double
b) Quadruple.
c) Halved.
d) Remains same.

9. Momentum of an object remains constant unless it is acted on by unbalanced force. This is called Newton's law of

a) inertia.
b) force.
c) action and reaction.
d) gravitation.

10. Two waves have the same speed. Wave A has double the frequency of wave B. How does the wavelength of wave A compares with that of wave B?

a) same
b) double
c) half
d) quarter

11. Radio waves from a star are observed at a wavelength of 20.08 cm. If the star and the Earth were motionless with respect to each other, the radio waves would have a wavelength of 20 cm. How fast are they moving from each other?

a) 1.6 x 106 m/s away
b) 1.6 x 106 m/s towards
c) 7.5 x 1010 m/s towards
d) 3 x 105 m/s away

12. Astronomers build observatories on mountaintops to benefit from

a) clear skies
b) atmospheric transparencies
c) the absence of light pollution
d) all of the above

13. If the temperature of a blackbody is raised by three times its initial temperature, by what factor will the total energy radiated by the body increase?

a) 3 times
b) 9 times
c) 27 times
d) 81 times

14. Which of the following statement about nuclear particle is always true?

a) Number of electrons = numbers of neutrons.
b) Number of electrons = number of protons.
c) Number of protons = number of neutrons.
d) All of the above.

15. The Earth is surrounded by atmosphere that is made up of mostly Nitrogen (N2), Oxygen (O2) and Carbon dioxide (CO2). If the amount of these gases were to decrease by about 50%, what would happen to the Earth's atmosphere?

a) Earth would not spin.
b) Atmosphere would be cooler than what it is now.
c) Atmosphere would be warmer than what it is now.
d) Atmosphere's temperature would remain the same.

16. When Moon is at the umbra shadow of the Earth, we would see a

a) total solar eclipse.
b) total lunar eclipse.
c) annular solar eclipse.
d) annular lunar eclipse.

17. What kind of compound the Venus cloud is made up of

a) water.
b) corbon dioxide.
c) sulphuric acid.
d) methane.

18. Which of the following is the smallest planet in our solar system?

a) Eris

b) Mercury

c) Pluto

d) Mars

19. Which of the following is the second largest planet in our solar system?

a) Jupiter

b) Saturn

c) Neptune

d) Uranus

20. Which of the following region a meteorite could come from?

a) Oort cloud.

b) Kuiper belt.

c) Asteroid belt.

d) All of the above.

Reference no: EM131053914

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