What method of control is being used in the following scenario? a researcher concerned about the motivation, fatigue, ability, interests, and so on of her participants randomly assigns them to groups.

Wavelength,frequency,and energy are related.what happens to a wave as it’s wavelength gets shorter?

Given the position vector of the particle r(t)=(t+1)i+(t^2−1)j+2t k, find the particle's velocity and acceleration vectors at t=1

In a heat engine if 1000 j of heat enters the system the piston does 500 j of work, what is the final internal energy of the system if the initial energy was 2000 j? 1. write the equation 2.list out your known variables 3.plug the numbers into the equations 4.solve 5.write your solution statement that includes initial energy and final