1. Why should we convert units within the metric system? 2. The metric system is based on units of

a) twenty five b) fives c) sixteen d) tens

3. Work the “SI Estimation Challenge” in the box on page 13.

4. Copy the “study skills” figure on page 14.

5. Convert 52,000 kilometers to centimeters. 52,000 km = cm

6. Convert 25 millimeters meters. 25 mm = m

7. A conversion factor is a ratio with a value of

a) one b) two c) five d)ten

Suppose a force of 60 n is required to stretch and hold a spring 0.1 m from its equilibrium position. a. assuming the spring obeys hooke's law, find the spring constant k. b. how much work is required to compress the spring 0.5 m from its equilibrium position? c. how much work is required to stretch the spring 0.6 m from its equilibrium position? d. how much additional work is required to stretch the spring 0.1 m if it has already been stretched 0.1 m from its equilibrium? a. kequals 600