A group of students observes that a wooden block (m=0.40 kg) on the end of a string with a radius of
0.7 meters makes 13 rotations in 20.7 seconds
when twirled.
A. What is the blocks tangential speed? (linear)
B. what is the blocks angular speed?

Consider two metallic rods mounted on insulated supports. one is neutral, the other positively charged. you bring the two rods close to each, but without contact, and briefly ground the the neutral rod by touching it with your hand. show answer correct answer what would be resulting charge (if any) on the initially neutral rod

How many dots must be added to the symbol to properly represent a standard nitrogen ion? a) 1 b) 3 c) 5 d) 8

An initially unpolarized light if intensity 500 w/m^2 passes through four polarizers. the transmission axis between adjacent polarizers is 45∘. what percentage of the initial intensity is transmitted by the system?