An observer located at Earth's North Pole (90N
latitude) would observe that all of the stars
a) move eastward across the sky.
b) rise in the east and set in the west.
c) move in concentric circles about the North Star.
d) are completely stationary in the sky.
Question 2
A 0.40-kg particle moves under the influence of a single conservative force. At point A where the particle has a speed of 10 m/s, the potential energy associated with the conservative force is +40 J. As the particle moves from A to B, the force does +25 J of work on the particle. What is the value of the potential energy at point B?
a. +65 J
b. +15 J
c. +35 J
d. +45 J
e. 40 J
The greenhouse effect: heat trapping by earth's atmosphere.
The monthly changes of angle between the direction of illumination by the Sun and viewing from Earth
West facade, Cha1134–1220; south spire, ca. 1160; north spire 1507–13.
Doppler Effect, Observer Moving
Geothermal energy and powers Earth’s systems
Earth’s Spheres