Intro test answer key

1. 2.300 x 10³⁹ mg²/km³

2. 0.376 ML

3. 0.4103 cf

4. 5832 broken pieces of chalk

5. 24336 toes

6. Density of phone = 2.97 g/mL

7.

On ground: no NRG

In hand: some potential

Moving up: Kinetic (decreasing as it slows), Potential (increasing as it gets higher)

At top of arc: Potential, no kinetic (the “road runner” moment when it stops briefly)

Coming down: potential (going down) and kinetic (going up)

On roof: no kinetic – all became heat absorbed by roof, potential (could say none (resting on roof) or could say lots (far above ground))

8. Fill a balloon with air (shows that it has volume), blow in someone’s face (shows it has mass)