Rapunzel rubs a balloon on her head to charge it, giving it 3.2 x 10¹³electrons.

1. What is the charge on the balloon after gaining the electrons?

Known(s)	Unknown(s)	Tool(s)	Solution(s)

Rapunzel then brushes her hair. Her hair brush gains a charge of +2x10^-6 C. The balloon is taped to the ceiling and the brush is brought directly below it vertically at a distance of 0.75 m.

1. What is the magnitude of the electrostatic force between the brush and the balloon?

Given(s)	Unknown(s)	Equation(s)	Substitution(s)	Solution(s)

1. Construct an LOL diagram to analyze the energy stored at each position for the rock show below. Friction is negligible.

• A 4 kg rock compresses a spring with a spring constant of 444 N/m by 1.22 m, all the way to the ground.
• The rock is launched and moves upwards with some velocity while at a height of 6 m.
• The rock is motionless at the peak of its motion and maximum height.
  

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