Blue whales communicate with infrasound and insects communicate with ultrasound. Find (a) the SHORTEST infrasound wavelength a blue whale can make in 0°C (icy) water (Hint: If you want a short wavelength, do you want a higher or lower frequency for a given wave speed?) and (b) the LONGEST ultrasound wavelength an insect can make in (room temperature) air.

James is trying to prove newton's 2nd law of motion. he tries to move four different objects with different masses, shapes, and sizes from point a to point b. the objects are a toy car, a car, a refrigerator, and a kitchen table. after some experimentation, he finds that force is dependent on the mass of the object, rather than it's size or shape. the object that takes the most force to move is the