In general knowledge terms, which simple machine is a rigid bar pivoted about a fixed point?

✅ A. Mass × velocity

Linear momentum is p = mv. Read more

✅ A. Ammeter

An ammeter measures electric current. Read more

✅ B. Convex lens

A convex lens is thicker at the center and converges parallel light rays. Read more

✅ A. 9.8 m/s²

Near Earth's surface, gravitational acceleration is approximately 9.8 m/s². Read more

✅ C. ½mv²

Kinetic energy is one-half mass times velocity squared. Read more

✅ D. Reflection

Reflection is the return of light from a surface. Read more

✅ D. Refraction

Refraction is the change in direction of light due to a change in speed between media. Read more

✅ D. 3 × 10^8 m/s

Light travels in vacuum at approximately 3 × 10^8 meters per second. Read more