North poles of magnets attract each other.

true or false

When an object is lifted 8 meters off the ground, it gains a certain amount of potential energy. If the same object is lifted 16 meters off the ground, its potential energy is A. four times as much. B. three times as much. C. twice as much. D.

What is the energy transformation of a phone charger?

Calculate ideal work (in J) when a single stream of 1 mole of air is heated and expanded from 25 C and 1 bar to 100 C and 0.5 bar. The temperature of the surrounding is 37 C.

What element has 102 neutrons and 70 electrons

when 12 is added to a certain number and the result is multiplied by 4. the final result is 60. find the number.

How is the energy of a nuclear reactor converted to electricity?

Assuming one nerve impulse must end before another can begin, what is the maximum firing rate of a nerve in impulses per second? Assume that it takes a millisecond for an impulse to travel through a nerve cell.

Which of the following statements has NOT been indicated by research on food and hunger behaviors? A) Forcing children to eat specific foods often has a negative effect on food preference.

Loghan and Kyle want to see if the type of ice cream in the freezer affects how hard or soft it is. Each time they placed a new brand of ice cream in the freezer, they put it in a different place.

2. If you wanted to create a voltage source using magnetic induction, which device would you use? A. Battery B. Thermocouple C. Dry cell D. Generator