1. A horse has a mass of 750 kg. How much force does this horse exert on the Earth's surface? Make sure to show all work and the equations used to solve
2. Calculate the amount of work done by a 750 kg horse as it pulls a cart 10m across a field. Make sure to should all work and the equations used to solve
3. True or false? The moon does not shine its own light, but simply reflects the light from the sun.
4. How would you describe the connection between magnetism and electricity?

• An electric current can create magnetism, but magnetism cannot create electric current.
• Magnetism can create electric current, but an electric current cannot create magnetism.
• Magnetism can create electric current and an electric current can create magnetism.

5. Choose all of the statements below that are true.

• he vernal equinox occurs near March 21.
• The autumnal equinox occurs November 22.
• The summer solstice occurs near June 21.
• The sun is seen overhead at the equator during the solstices.
• The sun is visible at 45 degrees N during the summer solstice.
• The tilt of Earth affects seasons, not the distance between the Sun and Earth.
• The Sun is not moving, but the tilt of Earth makes it look like it moves through our sky during the year.
• When the Sun's light is angled at the extreme, there is more light and heat at the surface.

6. Describe the various layers of the atmosphere. In your answer, please include:

• What are the names of the layers?
• What order are they in?
• How do pressure and temperature change with height in each layer?
• Assuming it were even possible, why would it be a bad idea to ride in a hot air balloon up to the thermosphere?