Two blocks (m₁ = 4.0 kg on a table, m₂ = 2.0 kg hanging over a pulley) are connected by a string. Assuming the table is frictionless, what is the acceleration of the system? Use g = 9.8 m/s².

The diagram shows electric field lines around two point charges. What is the sign of each charge?

In the circuit shown, a 12 V battery drives current through two resistors in series: R₁ = 4 Ω and R₂ = 8 Ω. What is...

The ray diagram shows an object placed farther than 2f from a converging (convex) lens. What is TRUE of the image?

The diagram shows energy levels of an atom. An electron transitions from level n = 3 to level n = 1. What happens?