Weigh up Earth's gravity and speeds

Exercise and reference answers

Questions

1. A

   Escape speed from Earth

   B

   Orbital speed at surface

   Higher value

   Escape speed from Earth

2. A

   Gravity at the equator

   B

   Gravity at the poles

   Higher value

   Gravity at the poles

3. A

   Earth radius at equator

   B

   Earth radius at poles

   Higher value

   Earth radius at equator

4. A

   Gravity at sea level

   B

   Gravity high above ground

   Higher value

   Gravity at sea level

Instructions

Tap the larger of the two quantities in each pair drawn from Earth's gravity and orbits.

Explanation