A sound source emits 20. 0 w of acoustical power spread equally in all directions. The threshold of hearing is 1. 0 × 10-12 w/m2. What is the sound intensity level 30. 0 m from the source?.

Work out sian speed for the first 30 minutes of her journey. give your answer in km/h.

If two parallel light rays hit a mirror, they will not be parallel to each other after they reflect.

What would people living along the coast in south florida do if there was a hurricane warning? move to locations away from the water flock along coasts to watch the natural phenomenon buy instruments to predict the exact location of the hurricane measure water levels to know the exact time of the hurricane