Charlie hears an advertisement for Cremefresh lotion. The advertisement says that Cremefresh lotion heals dry skin 75% faster than other leading lotion brands. How can Charlie use scientific thinking to find out if the lotion company's claims are true?

Your target variable is δf, the magnitude of the difference in frequency between the waves emitted from the sonar device and the waves received by the device after reflecting off the whale. write an expression for δf in terms of the relevant frequencies using the subscript notation introduced above.

We put a force of 50n on an object and the acceleration is 100 m/s². what is the mass of the object?

Yvette hangs a 2.4kg bird feeder in the middle of a rope tied between two trees. the feeder creates a tension of 480 n in each side of the the rope.