Which statement about the cosmic microwave background isnottrue? a) it is the result of a mixture of radiation from many independent sources, such as stars andgalaxies. b) it is thought to be radiation that began its journey to our telescopes when the universe wasabout 380,000 years old. c) with the exception of very small variations, it appears essentially the same in all directions inwhich we look into space. d) its spectrum corresponds to a temperature of just under 3 degrees above absolute zero

Two red blood cells each have a mass of 9.0 multiply.gif 10-14 kg and carry a negative charge spread uniformly over their surfaces. the repulsion arising from the excess charge prevents the cells from clumping together. one cell carries −2.50 pc of charge and the other −3.10 pc, and each cell can be modeled as a sphere 7.5 μm in diameter. (a) what speed would they need when very far away from each other to get close enough to just touch? assume that there is no viscous drag from any of the surrounding liquid. answer is: 321 m/s how do i find this (b) what is the maximum acceleration of the cells in part (a)? answer is: 1.38e+10 m/s2 how did they find this answer

Spend time observing or thinking about events that involve matter and energy. which events can you explain? which events can’t you explain?

Acar moves a distance of 50.0 km west, followed by a distance of 64.9 km north what was the magnitude of the displacement of the car, in units of kilometers?