All I need help on, is the first one on the top row. Thanks :))

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?

Natural forces that can alter ecosystems include seasons and climate changes. t or f

We put a force of 50n on an object and the acceleration is 100 m/s². what is the mass of the object?