What is the speed of a wave that has a wavelength of 0.4 m and a frequency of 10 hz

Which of the following is not a part of the respiratory system? a. pharynx b. trachea c. pancreas d. larynx

The star betelgeuse is about 600 light-years away. if it explodes tonight, a. we'll know because debris from the explosion will rain down on us from space. b. we'll know it immediately because it will be brighter than the full moon in the sky. c. we won't know about it until 600 years from now. d. none of the above.

You hang a book bag on a spring scale and place the bag on a platform scale so that the platform scale reads 23.7n and the spring scale reads 13.8n. what is the magnitude of the force that earth exerts on the bag?