QUESTION 4 Suppose you are in an elevator that is traveling upward at a constant

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QUESTION 4 Suppose you are in an elevator that is traveling upward at a constant speed. What force acting on you is strongest, and why?

a- Gravity is strongest because it is always present.

b- The elevator pushing you up is strongest because you are moving upward.

c- The two forces are equal because you aren't accelerating.

d- You can't tell from the information given.

QUESTION 5 Why do we experience spring tides?

a- The high tides from the Sun and Moon occur in the same places at a given time.

b- The Moon pulls on one side of the Earth and the Sun pulls on the other side.

c- The Sun's tide becomes stronger than the Moon's tide.

d- The high tides from the Sun and Moon occur in different places at a given time.

QUESTION 6 Is this a sensible statement? Because of their higher frequency, X rays must travel through space faster than radio waves.

a- No, this is not sensible. X rays and radio waves both travel at the speed of light.

b- No, this is not sensible. X rays have a lower frequency than radio waves.

c- No, this is not sensible. Radio waves cannot travel through space because there is no air to carry them.

QUESTION 7 According to the nebular theory, what are asteroids and comets?

a- They are the shattered remains of collisions between planets.

b- They are chunks of rock or ice that were expelled from planets by volcanoes.

c- They are leftover planetesimals that never accreted into planets.

d- They are the shattered remains of collisions between moons.

e- They are chunks of rock or ice that condensed long after the planets and moons had formed.

QUESTION 8 The age of the solar system can be established by radioactive dating of

a- the oldest rocks on Earth

b- the oldest rocks on the Moon

c- the atmosphere of Mars

d- the oldest meteorites

e- It hasn’t been done yet, but the age of the solar system could be obtained from a sample of Io’s surface.

QUESTION 9 A planet is found orbiting a star like the Sun. The planet has a mass of 0.8 Earth masses and it is 10 AU from its star. Based on our model of solar system formation, what is the most likely composition of this world?

a- 67% rock and 33% metal

b- 95% hydrogen compounds and 5% hydrogen and helium

c- 80% hydrogen and helium, 10% hydrogen compounds, 10% rock and metal

d- 48% rock and metal, 50% hydrogen compounds, and 2% hydrogen and helium

QUESTION 10 Large comets and asteroids (more than 10 km across) that reach the Earth

a- Can hit the Earth's surface and even affect the global climate.

b- Are deflected back into space by the atmosphere.

c- Burn up in the atmosphere and have no effect on the surface.

d- Cannot exist, since no such object can ever get close to the Earth.

Explanation / Answer

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