Physical Science with Thomason
A meter is not equal to
.001 km
Which one or more of the following is a vector quantity? angular momentum linear momentum kinetic energy potential energy Both A and B
A and B
Relative to the stars, the moon seems to move
Eastward
The speed of an object moving in a circle is doubled. The centripetal force needed is
Four times as much as before
If the moon were half as far from the earth as it is now, the gravitational force it exerts on the earth would be
Four times its present value
When the sun, the earth, and the moon are all in line,
High tides are higher than usual Low tides are lower than usual
When first proposed, a scientific idea is usually called a
Hypothesis
A hole is drilled to the center of the earth and a ball is dropped into it. When the ball is at the earth's center, compared with their respective values at the earth's surface,
Its mass is the same and its weight is 0
The discovery that the planetary orbits are ellipses rather than circles was made by
Kepler
Arrange the following planets in the order of their distance from the sun. venus mars earth mercury
Mercury Venus Earth Mars
A planet that cannot be seen with the unaided eye is
Neptune
The scientist who showed that gravity accounts for Kepler's laws of planetary motion was
Newton
A week is the time needed for the sun to drift completely around the sky. the earth to turn completely on its axis. the moon to drift completely around the sky. None of the choices are correct
None are correct
The length of the year is
Slightly more than 365 days
In which system is the earth assumed to be the center of the universe?
The Ptolemaic system
What is responsible for the tides
The moon with the suns influence modifying the tidal range
What is always the same to all observers?
The speed of light
What never changes when two or more objects collide is
The total momentum of all objects
The British unit of length closest to the meter is the
Yard
The sun exerts a gravitational force on the earth and the earth exerts a gravitational force on the sun. The force the earth exerts
can be considered either as the action or as the reaction force
The time needed for a planet to orbit the sun
depends on the average distance of the planet from the sun
The stars in a constellation
form a pattern in the sky as seen from the earth
Stars and planets are round because
gravity forces them into this shape
Astrology
is Nonsense
The speed of a planet in its orbit
is highest when it is closest to the sun
The escape speed needed for an object to leave the earth permanently
is more than the minimum speed it needs to become an earth satellite
A bullet is fired upward. As it rises,
its mass remains the same while its weight decreases
What distinguishes the scientific method from other ways of looking at the natural world is
its reliance on experiment and observation
What is not a unit of power?
joule-second
An object that has linear momentum must also have
kinetic energy
A regularity in observed data or a relationship between different quantities is usually called a
law
in the formula E0 =mc^2, the symbol c represents the speed of
light
Scientific theories
must be constantly reviewed to see whether they are in accord with new experimental observations
The period of the earth's orbit around the sun is
one year
A moving object does not necessarily have
potential energy
A rocket is fired in space. As it moves, the total momentum of the rocket and its exhaust gases
remains the same
Gravity is not
responsible for holding atoms and molecules together
In the distant past, the length of the day was
shorter than 24 hours
A golf ball and a ping-pong ball are dropped in a vacuum chamber. When they have fallen halfway down, they have the same
speed
A day is the time needed for
the earth to turn completely on its axis
A year is the time needed for
the sun to drift completely around the sky
