Can you design a single pack that can have a dual usage (as a cold and hot pack)? Explain.

How many moles is 14.5 cm^3 of platinum? the density of platinum is 21.45 g/cm^3.

Calculate the frequency of a wave in a spring toy. the wave has a speed of 1.1 meters per second and a wavelength of 0.1 meters. *

Observation and experimentation have led many scientists to accept a theory about the origin of the universe. this theory is called the big bang theory. scientific evidence collected and observed by scientists around the world suggests that the universe is ever expanding from a hot and dense initial state. what makes this a scientific theory? (2 points)