Earth is closer to the Sun in winter than in summer. The orbital speed of Earth about the Sun is therefore faster during the
1) summer.
2) winter.
3) is the same for all seasons.
Correspondingly, the gravitational force between the Sun and Earth is strongest during
4) summer.
5) winter.
6) is the same for all seasons.
Question 2
A projectile is launched vertically upward at 40 m/s. If air resistance is negligible, its speed upon returning to its starting point is
1) less than 40 m/s.
2) 40 m/s.
3) more than 40 m/s.
All along the ball's trajectory, its acceleration is
4) g downward.
5) g at an angle.
6) zero.
If air resistance does affect motion, then the ball's speed upon returning to its starting point is
7) less than 50 m/s.
8) 50 m/s.
9) more than 50 m/s.
Life on Earth
An alpine marmot at the end of summer. Note the fattened belly.
The Sun is the nearest star to Earth.
Earth’s Spheres
Earth’s Lithospheric Plates
Earth 150 Million Years Ago