7. (a) Describe a physical system and a social system that have had a positive effect on
your community or environment.
(b) Describe ways in which a physical system
and a social system have had a negative
effect on your local community or
environment. bu
a
ma
Solve a Problem!

One form of energy can be another type of energy. a. created to form b. transformed into c. destroyed and then created to form

Which missing item would complete this alpha decay reaction ? > 228/88ra + 4/2he a.224/96 rn b. 232/90 th c. 230/92 u d. 235/92 u

Aspaceship starting from a resting position accelerates at a constant rate of 9.8 meters per second per second. how far will the spaceship travel if its final speed is 1 percent the speed of light (300,000,000 m/s)? a. 3.1 × 106 m b. 2.94 × 108 m c. 7.8 × 1010 m d. 4.6 × 1013 m