A convex lens produces a real image 2 cm from the lens. If an object was placed 16 cm away, what is the focal length of the lens

The astronauts on the space shuttle flights experienced an acceleration of 29 m/s2 (about 3 "g's") during lift-off. what upward force must the astronaut's seat apply to the astronaut in order to cause this acceleration? assume the astronaut's mass is 70 kg, and compute this force when the acceleration is near the earth's surface so their weight equals latex: mg m g .

Calculate a pendulums frequency of oscillation (in hz) if the pendulum completes one cycle in 0.5s.

Which wave is the result of amplification and produces a louder sound