1. On Earth, a box has a mass of 10 kg. What is its weight? 2. On Earth, a table has a mass of 97 kg. What is its weight?
3. A man has a mass of 66 kg on Earth. What is his weight?
4. A car has a mass of 1000 kg on Earth. Two passengers each have a mass of 50kg. What is
the total weight of the car and passengers?
5. Uncle Harry weighs 80 newtons. What is his mass?
6. Aunt Jane weighs 45 newtons. What is her mass?
7. A boat weighs 4000 newtons. What is its mass?
8. The 4000 N boat picks up 5 passengers who each weigh 500 N. What is the total mass of the
boat and passengers?
9. A woman has a mass of 55 kg on Earth. What is the woman's mass on the moon where the
acceleration due to gravity is 1.67 m/s??
10. A woman has a mass of 55 kg on Earth. What would be the woman's weight on the moon
where the acceleration due to gravity is 1.67 m/s??

Follow these directions and answer the questions. 1. set up the ripple tank as in previous investigations. 2. bend the rubber tube to form a "concave mirror" and place in the ripple tank. the water level must be below the top of the hose. 3. generate a few straight pulses with the dowel and observe the reflected waves. do the waves focus (come together) upon reflection? can you locate the place where the waves meet? 4. touch the water surface where the waves converged. what happens to the reflected wave? 5. move your finger twice that distance from the hose (2f = c of c, center of the curvature) and touch the water again. does the image (the reflected wave) appear in the same location (c of c)? you may have to experiment before you find the exact location. sometimes it is hard to visualize with the ripple tank because the waves move so quickly. likewise, it is impossible to "see" light waves because they have such small wavelengths and move at the speed of light. however, both are examples of transverse waves and behave in the same way when a parallel wave fronts hit a curved surface.

When a spring is compressed, the energy changes from kinetic to potential. which best describes what is causing this change? work power gravitational energy chemical energy

How does an observation about an object differ from an inference about that object