Quarter 2_PhySci

Front

What is Kepler’s third law of planetary motion?

Back

Planets have the same T²/R³ ratio.

Front

What did Hertz’ experiments prove about the speed of electromagnetic (EM) waves?

Back

The speed of EM waves is equal to the speed of light.

Front

What is an inertial reference frame?

Back

A reference frame in which an object not acted upon by forces moves at a constant velocity.

Front

In which direction does the Sun rise according to Babylonian and Egyptian records?

Back

East.

Front

What shape is the Earth?

Back

Oblate spheroid.

Front

Why is the Earth not a perfect sphere?

Back

Due to the centrifugal force of rotation being highest at the equator than at the poles.

Front

What is the definition of centrifugal force?

Back

The apparent force that draws a rotating body away from the center of rotation.

Front

What is the definition of centripetal force?

Back

The force that acts on an object moving in a circular path, directed towards the center of the circle.

Front

What is the significance of the gnomon in ancient astronomy?

Back

It was used to observe the motion of the sun.

Front

What does Kepler's first law state?

Back

Planets move in elliptical orbits with the Sun at one focus.