In a first order decomposition in which the rate constant is 0.204 sec-1, how long will it take (in seconds) until 0.399 mol/L of the compound is left, if there was 0.991 mol/L at the start? (give answer to 3 decimal places)?

A26 cm object is 18 cm in front of a plane mirror. a ray of light strikes the object and is reflected off the mirror at a 42-degree angle. what is the angle of reflection? degrees what type of image is formed? what is the size of the image? cm

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

What properties of a moving object are used in determining the object's energy of motion