Physical Science with Thomason

अब Quizwiz के साथ अपने होमवर्क और परीक्षाओं को एस करें!

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


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