Why is soft iron used for the core of an electromagnet?

How does electronic duster work

A heat engine has a cold reservoir of 250°C and a hot reservoir of 715°C. What is the efficienvy of the engine?

Which has the same meaning as air pressure? A weight B atmosphere pressure C air Force D atmosphere decline

A carbon resistor is to be used as a thermometer. On a winter day when the temperature is 4.00 ∘C∘C, the resistance of the carbon resistor is 217.3 ΩΩ. What is the temperature on a spring day when the resistance is 215.

What variables show a direct relationship? Check all that apply. the speed of a car and the distance traveled the elevation above sea level and the air temperature the number of students in a cafeteria and the amount of food consumed the mass of an

How do invasive species spread? identify three methods. Why do invasive species pose such a threat?

If earth somehow expanded to a larger radius, with no change in mass, how would you're weight be affected? How would it be affected if earth shrunk?

Consider a helium balloon on a string tied to the seat of your stationary car. The windows are closed, so there is no air motion within the car. The car begins to accelerate forward. Which way will the balloon lean, forward or backward

The force of gravity acts upon meteors from the rocky asteroid belt between mars and Jupiter. Where is the force of gravity most likely to pull these meteors

Sally turns on her cellular telephone to speak to her friend who is located thousands of miles away. Which of the following best describes how such a telephone is able to transmit and receive information? A.