How much helium gas would it take to fill a gas balloon with a volume of 11: 0 cm3 when the temperature is 41.0◦c and the atmospheric pressure is 790 mm hg? answer in units of mol?

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?

When a book falls from a shelf to the ground without anyone pushing on it, no work is done on the book. true or false

What does the law of conservation of mass state?