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Which of these things is NOT caused by a gravitational force?

Which of the equations below is an incorrect rearrangement of the equation: v=(2πr)/T

IGCSE Astronomy

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Questions 9

Answers

1
Which of the equations below is an incorrect rearrangement of the equation: v=(2πr)/T
r = vT ÷ 2π
π = vT÷2r
T = v÷(2πr)
T = 2πr ÷ v
2
Which of these things is NOT caused by a gravitational force?
artificial satellites orbiting earth
rotation of earth on its axis
moon orbiting earth
comets orbiting sun
3
Which statement is true?
Comet's orbit planets in heavily elliptical orbits
Earth orbits the sun in a circular orbit
Artificial satellites have a circular orbit
The moon's orbit around the earth is heavily eliptical
4
Which of these best describes the orbit of the sun around the earth
spherical
slightly elliptical
heavily eliptical
none of the above
5
Which of the following is true?
A solar system is a collection of billions of stars
There are many galaxies in a solar system
The milky way contains 8 planets and pluto
All galaxy contains billions of stars
6
An object has a mass on Earth of 72kg. If g_m_oon=1.6m/s², what is the object's mass on the moon?
115kg
72kg
115N
72N
7
What is half of 2 + 2?
1
4
2
3
8
"g" stands for what?
gravitational pull
weight
gravitational field strength
gravity
9
Which of the following is NOT a use for an artificial satellite?
Military Intelligence
Astrological research
Communications
Weather forecasting and climate observations