What is a device made by joining two different materials to form a circuit that produces an electric current?

a. convertor

b. resistor

c. semiconductor

d. thermocouple

The materials carried by the circulatory system include which of the following? (1) blood, (2) hormones, (3) oxygen, (4) cellular wastes. a. 1 only b. 1 and 2 c. 1, 2, and 3 d. 1, 2, 3, and 4

A wave has a wavelength of 2 meters and a frequency of 1.5 Hz. What is its speed?

The term sustainable living is often referred to as which of the following? A. green living B. active lifestyle C. healthy lifestyle D. meat-free living

A crate of apples weighing 71.4 N sits at rest on a ramp that runs from the ground to the bed of a truck. The ramp is inclined at 20.0° to the ground. What is the interaction partner of normal force? 1.

What forms when air masses with different temperatures meet? a. storms. b. thunder. c. fronts. d. currents

Why do different elements emit different colors of light

In an experiment, 108 J of work was done on a closed system. During this phase of the experiment, 79 J of heat energy was added to the system. What was the total change in the internal energy of the system?

J. J. Thomsons experiments provided evidence that an atom

How does our sun differ from most other main sequence stars?

A large body of air hats has similar properties of a temperature and moisture is a