Describe the two “recycling” mechanisms that are associated with stars (one during each star’s life and the other connecting generations of stars).

The velocity of car is 80.0 miles per hour. what is the velocity of car in meters per second? (1 km -0.621 miles) m/s

Suppose you have three polarizing filters, with the second at an angle of 42∘ to the first and the third at an angle of 90∘ to the first. by what perfect will the original intensity of unpolarized light be reduced to after passing through all three filters?

Could someone . i have tried to solve myself but my calculation is off