A balloon rubbed against denim gains a charge of -3.0 uC. What is the electric force between the balloon and the denim when the two are separated by a distance of 6.0 cm? (As- sume that the charges are located at a point.) The value of the Coulomb constant is 8.98755 x 10° Nm²/C2. Include direction of the force. 2

Apair of 10μf capacitors in a high-power laser are charged to 1.7 kv.a. what charge is stored in each capacitor? b. how much energy is stored in each capacitor?

Aspring is used to stop a 50-kg package which is moving down a 20º incline. the spring has a constant k = 30 kn/m and is held by cables so that it is initially compressed 50 mm. knowing that the velocity of the package is 2 m/s when it is 8 m from the spring and neglecting friction, determine the maximum additional deformation of the spring in bringing the package to rest.

Petroleum contains energy. a. light b. kinetic c. chemical d. mechanical