You may have heard of the cosmic microwave background (CMB) before - it is leftover thermal radiation from when the Universe was young and opaque, and we see it in every direction we look in space. We'll talk a lot more about it in module 13, but in the meantime...below is a spectrum of the cosmic microwave background. Can you use it to estimate the CMB's current temperature? Tip: Watch out for units!

Jessie ran 5000 meters from the cops and an average speed of 6 meters / second before he got caught . how long did he run?

Afisherman notices that his boat is moving up and down periodically without any horizontal motion, owing to waves on the surface of the water. it takes a time of 2.20 s for the boat to travel from its highest point to its lowest, a total distance of 0.670 m . the fisherman sees that the wave crests are spaced a horizontal distance of 5.80 m apart. (a) how much is the wavelength? (b) find the period of the wave. (c) how fast are the waves traveling? (d) what is the amplitude a of each wave?

The magnitude of the magnetic field at a certain distance from a long, straight conductor is represented by b. what is the magnitude of the magnetic field at twice the distance from the conductor? a. at twice the distance, the magnitude of the field is 4b. b. at twice the distance, the magnitude of the field is 2b. c. at twice the distance, the magnitude of the field is b/2.d. at twice the distance, the magnitude of the field is b/4.e. at twice the distance, the magnitude of the field remains equal to b.