Gravitation

"There is a force of attraction not only between the Earth and an apple but also between the Earth and the Moon."

The above statement is one of the basic concepts which are important in the field of gravity. Who was the man that introduced the concept?

• Elon Musk

• Isaac Newton

• Galileo Galilie

• Albert Einstein

Uranus takes 84.0 years for a complete orbit, while Saturn takes 29.5 years. Why does the Uranus take longer time compared with Saturn for a complete orbit?

• Uranus rotates slower than Saturn

• Uranus is smaller in size than Saturn

• Uranus has larger radius of orbit than Saturn

• Uranus is closer to the Sun than Saturn

Which concept and law can be used to determine the formula of Kepler's Third Law?

• Inersia and Newton's First Law

• Period and Kepler' First Law

• Radius of orbit and Kepler's Second Law

• Circular motion and Newton's Universal Law of Gravitation

Man-made satellites move in their own orbits in space for certain purposes. Which statement is not true about the purpose why satellites are invented?

• To show the ability of science field

• To study the upcoming weather on the Earth

• To get a clearer image of the surface of the Earth

• To ensure that communication systems become more effective

Geostationary and non-geostationary satellites are two types of satellites orbiting the Earth. There are a few differences between the two satellites. Which statement is true?

• Geostationary satellites are above the different geographical positions on the surface of the Earth

• Geostationary satellites have orbital period shorter than non-geostationary satellites

• MEASAT and INSAT are geostationary satellites, while TiungSAT and RazakSat are non-geostationary satellites

• Geostationary satellites do not necessarily move around the Earth in the same direction as the direction of the Earth's rotation

"The minimum velocity required by an object on the surface of the Earth to overcome the gravitational force". Based on the above statement, what is the type of velocity?

• Zero velocity

• Escape velocity

• Linear velocity

• Uniform velocity

Astronomer Johannes Kepler has corrected the theoretical model of the movement of the planets around the Sun that Copernicus has put forward. What is the name of the model?

• Heliocentric

• Heliostatic

• Geocentric

• Geo-orbit

"A line that connects a planet to the Sun sweeps out equal areas in equal times when the planet moves in their orbit.".

The following statement refer to

• Kepler's first law

• Kepler's second law

• Kepler's third law

Man-made satellites will orbit the Earth at high linear speeds. What is the effect if the linear speed of the satellite decreases?

• The satellite will be released into space

• The satellite is no longer orbit the Earth

• The satellite will rise to the higher orbits

• The satellite will enter the Earth's atmosphere and burn

What is the benefit and implication of the study and discovery of escape velocities for the Earth?

• The Earth maintains a layer of atmosphere due to its high escape velocity values

• Prevent the rocket launcher engineer in calculating rocket fuel

• Supersonic planes will escape into outer space

• Lots of air molecules are escaping into outer space