A magnetic field produced by a current has the following characteristic (s)

A. their field can be turned on and off

B. they can have their strength changed

C. their direction could be reversed

D. All of the above

E. none of the above

A suction cup works by creating a vacuum between the rubber cup and surface its stuck to. if the total area of the rubber cups is 0.

What does the index of refraction directly measure?

Which type of solute is least likely to dissolve in water a. ionic b. polar c. nonpolar d. alcohol

How would the force of Earth's gravity change if a satellite were to orbit at a distance that was only 1/2 of its original orbit? A. It cannot be determined. B. The force of gravity would increase. C. The force of gravity would not change. D.

Cell phone jammers work by interfering with the signals exchanged between cell phones and nearby cell phone towers. As a result, cell phones being affected by cell phone jammers do not receive communication signals from nearby towers.

Explain what surface tension is.

A helium-filled balloon is launched when the temperature at ground level is 27.8°c and the barometer reads 752 mmhg. if the balloon's volume at launch is 9.47 * 10^{4} 4 l, what is the volume in liters at a height of 36 km, where the pressure is 73.

Consider the moment when the spring is at its maximum compression. At that moment, the kinetic energy, the gravitational potential energy, and the elastic potential energy are, respectively, a - zero, at a maximum, and at a maximum b - at a maximum,

Ari, a young patient who is regularly treated by a psychiatrist, feels compelled to carry out repetitive tasks the same way very frequently. If Ari does not conduct these tasks with extreme precision, he can feel extremely nervous and uncomfortable.

A friend says, "Stars produce energy by a fusion chain reaction of helium into hydrogen." Evaluate the validity of this statement. A) It is an valid statement. Stars produce energy by a fusion chain reaction of hydrogen into helium.