Straw polls are___. A. scientifically based B. representative samples C. biased sampling D. cluster samples

What was Galileo's contribution to the study of motion?

What a relationship between flame color and chemical name.

If the cold temperature reservoir of a Carnot engine is held at a constant 331 K, what temperature should the hot reservoir be kept at so that the engine efficiency is 0.55?

Which is an example of something heated by conduction

You are given a long length of string and an oscillator that can shake one end of the string at any desired

A billiards ball B rests on a horizontal surface and is struck by another billiards ball A of the same mass m = 0.2 kg. Ball A is initially moving at 18 m/s and is deflected 28° from its original direction. Assume the collision is elastic.

A model rocket is fired vertically from the ground with a constant acceleration of 45.3 m/s2 for 1.46 s at which time its fuel is exhausted. What is the maximum height (in m) reached by the rocket?

A crude approximation for the x component of velocity in an incompressible laminar boundary layer is a linear variation from u = 0 at the surface (y = 0) to the freestream velocity, U, at the boundary-layer edge (y = δ).

Why did dad leave mom?

Sal drew the electron dot diagram of an aluminum atom as shown. How should Sal correct his diagram? He should add five more dots so that the atom obeys the octet rule. He should add ten more dots so that all thirteen electrons are shown.