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

What are some factors that might contribute to uncertainty in a measurement?

A material that resists the flow of electrons is called a (an) A conductor. B circuit. C insulator. d resistor

What are earths two internal sources of heat energy?

The length of a sheet of U. S. standard (letter-size) paper is closest to

Which industry was an oligopoly in the United States? a. agriculture industry c. steel industry b. shipping industry d. coal industry

A ball is being rolled by a normal push of 1000N. it is opposed by friction which has a force of 0.3kN and air resistance which has a force of 23N. Calculate the resultant force.

Consider a Young's two-slit experiment in which the wavelength of light is 37% smaller than the distance between the slits.

Which of the following situations would produce an average velocity of zero? A) a round-trip to school and back B) a horse galloping in a field C) the criss-crossing path of a flying bug D) a trip, first to the moon, then onto Mars

A 111.6 g sample of iron was heated from 0°C to 20°C. It absorbed 1004 J of energy. What is the specific heat capacity of iron?

A car is driving towards a brick wall at a constant velocity (don't try this at home!) and the driver honks the horn of the car. the sound of the horn reflects from the wall and the echo is heard by the driver.