sce4113 ch. 1, 5, – Flashcards
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the scientific method of Galileo and Bacon is:
worthy of memorizing.
the method of choice for most discoveries.
one of many ways of making discoveries.
today outmoded.
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one of many ways of making discoveries
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A scientific hypothesis that is deemed valid must have a test for proving it
correct.
more than one time.
without error.
wrong.
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wrong
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Galileo showed that scientific knowledge advances by
experimentation.
maintaining personal courage.
holding fast to what you believe when others question you.
accepting the ideas that are most widespread.
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experimentation.
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A theory in science is
an agreement between trained investigators.
an educated guess.
forever true.
a synthesis of well-tested ideas.
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a synthesis of well-tested ideas.
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Religion is concerned mainly with the
furthering of physical truths.
difference between right and wrong.
natural world.
spiritual world.
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spiritual world.
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Technology is a tool for
making the measurements of science.
extending truth.
solving social problems.
applying scientific discoveries.
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applying scientific discoveries.
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Before experimental results can be considered to be valid, they mainly must be
useful.
structured.
reproducible.
acceptable to qualified researchers.
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reproducible.
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When the masses of two planets are doubled, the force of attraction between them
remains the same.
quadruples.
doubles.
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quadruples.
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A satellite that maintains a constant speed in orbit follows
a parabola.
a straight line path.
an elliptical path.
a circular path.
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a circular path
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Occupants in a rotating donut-like space habitat experience weight due to
a support force.
pulls by nearby planets.
gravity.
inertia.
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a support force
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The crew of a cargo plane wishes to drop a crate of supplies on a target below. To hit the target, when should the crew drop the crate? Ignore air resistance.
Before the plane is directly over the target
After the plane has flown over the target
When the plane is directly over the target
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Before the plane is directly over the target
At the moment it is released, the crate shares the plane's horizontal velocity. In the absence of air resistance, the crate would remain directly below the plane as it fell.
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Which ball (if either) has the greatest speed at the moment of impact?
The ball thrown horizontally
Both balls have the same speed.
The dropped ball
answer
The ball thrown horizontally
The two balls have the same vertical velocity when they land, but the thrown ball has an additional horizontal velocity component. Since speed is defined as the magnitude of the resultant velocity vector, the thrown ball is moving faster when it lands.
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Which projectile spends more time in the air, the one fired from 30∘ or the one fired from 60∘?
The one fired from 30∘
They both spend the same amount of time in the air.
The one fired from 60∘
answer
The one fired from 60∘
The projectile fired from 60∘ has a greater vertical velocity than the one fired from 30∘, so it spends more time in the air.
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How does the gravity in the Space Shuttle compare with the gravity on Earth's surface?
The gravity in the Space Shuttle is approximately equal to the gravity on the surface of the Earth.
The gravity in the Space Shuttle is much larger than the gravity on Earth's surface.
The gravity in the Space Shuttle is much smaller than the gravity on Earth's surface.
answer
The gravity in the Space Shuttle is approximately equal to the gravity on the surface of the Earth.
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Why does the gravity in the Space Shuttle compare with the gravity on Earth the way it does?
The Space Shuttle is about the same distance from the center of the Earth than from the surface of the Earth.
The Space Shuttle is much farther away from the center of the Earth than the surface of the Earth.
The Space Shuttle is much closer to the center of the Earth than the surface of the Earth.
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The Space Shuttle is about the same distance from the center of the Earth than from the surface of the Earth.
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Why do the astronauts in the Space Shuttle float around?
There is no gravity in the Space Shuttle because it is too far away from the center of the Earth.
The Space Shuttle is in free fall, so the shuttle and the astronauts inside it are continuously falling toward the Earth. They thus experience apparent weightlessness.
There is no gravity in the Space Shuttle because it is completely enclosed and shielded from the effects of gravity due to the Earth.
answer
The Space Shuttle is in free fall, so the shuttle and the astronauts inside it are continuously falling toward the Earth. They thus experience apparent weightlessness.
question
When the distance between two planets is doubled, the force of attraction between them
decreases to one quarter.
remains the same.
decreases to half.
doubles.
answer
decreases to one quarter
