6. A sound wave travels at 343 m/s it covers a
distance of 50 meters what is the frequency?

Determine the amount of work done when a crane lifts a 100-n block form 2m above the ground to 6m above the ground

Astudent creates a model of a closed ecosystem by filling a glass tank half full with water, then adding 10 snails and two small aquatic plants. the next day, all the snails are dead. what is the most likely cause of their death?

An architect plans to use solar energy to heat the next house he designs. what principle of absorption and infrared energy can be applied to the design of the new house? how could she apply to those principals?