if you want to have a scientifically valid sample for a study you are doing which of the following conditions must be met

You are driving straight, travelling at 25 mph. You stomp on the brakes and come to a complete stop in a distance of 15 m.

Consider the transition from the energy levels n = 3 to n = 6. what is the wavelength associated with this transition, in nm?

An aluminium container of mass 100 GM contains 200gm of ice at - 20c heat is added to system at rate of 100 Cal/s find temp of system after 4minutes

How many hectopascals corresponds to the pressure of a 15 mm high column of mercury?

Which term best describes the phrase "something that happens"? A. Experiment B. Observation C. Hypothesis D. Phenomenon

A 2-kg object is dropped from a height of 1000 m. What is the force of air resistance on the object when it reaches terminal velocity

What is the approximate increase in size from a 1 w to a 2w carbon resistor?

I am looking for this answer : Which shows a correct order of steps in the scientific method? develop a hypothesis, analyze data, make observations, draw conclusions make observations, draw conclusions, develop a hypothesis, analyze data.

A gas in a piston is compressed doing - 439 j of work, and its internal energy increases by 318 j. how much heat flows? (be careful with + and -. + w = expansion. + q = added, + u = temp goes up) (unit = j)

A loop of wire is placed in a uniform magnetic field. (a) For what orientation of the loop is the magnetic flux a maximum? The plane of the loop is perpendicular to the magnetic field. The plane of the loop is parallel to the magnetic field.