Which is a balanced equation for this reaction? a. fe + h2so4? fe2(so4)3 + h2 b. 2fe + h2so4? fe2(so4)3 + h2 c. fe + 3h2so4? fe2(so4)3 + 3h2 d. 2fe + 3h2so4? fe2(so4)3 + 3h2

Aspecial electronic sensor is embedded in the seat of a car that takes riders around a circular loop-the-loop ride at an amusement park. the sensor measures the magnitude of the normal force that the seat exerts on a rider. the loop-the-loop ride is in the vertical plane and its radius is 23 m. sitting on the seat before the ride starts, a rider is level and stationary, and the electronic sensor reads 740 n. at the top of the loop, the rider is upside down and moving, and the sensor reads 370 n. what is the speed of the rider at the top of the loop?

Aknife blade is a(n) a. lever b. screw c. wedge d. inclined plane

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?