Space Technology — Unit test Answers

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What force acts between Earth and the moon?

gravity

mass

motion

newtons

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Which characteristic do Mercury and Mars share?

many moons

rocky surfaces

thick atmospheres

moderate temperature fluctuations

Which statement describes competition within a population?

Several killer whales migrate to a new location.

Two male sea horses fight to win over a female.

Several elk travel together to find and share water.

Different kinds of garden plants take in water from the soil.

Which causes objects in the universe to resist a change in speed or direction?

gravity

inertia

motion

orbit

An object has a mass of 15 kg and is accelerating to the right at 16.3 m/s2. The free-body diagram shows the horizontal forces acting on the object.

-5.5 N

-15 N

-244.5 N

-494.5 N

Why did scientists struggle for thousands of years to accurately describe the solar system?

Venus has phases like the moon.

Many people spoke Italian and did not understand Latin.

The planets appeared to move backward in the sky occasionally.

Scientists could not explain why the Sun appeared to rise and set every day.

Researchers aboard the International Space Station use the latest technology to advance our understanding of which concept?

soil and rocks

health and medicine

electromagnetic spectrum

radio waves in space

Which lists the waves in order of wavelength, from longest to shortest?

X-rays, infrared, radio waves

infrared, visible light, gamma rays

ultraviolet, microwaves, visible light

radio waves, gamma rays, visible light

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