Why are experiments often performed in laboratories?
a. there are more variables in a laboratory setting.
b. you can control variables more easily.
c. they are better at representing the real world.
d. scientists only want to know what happens in labs.

The first law of thermodynamics states that heat added to a system is neither created nor destroyed but is transformed ⇒ as it changes into other forms of energy.

If the ama of the inclined plane below is 2, calculate the ima and efficiency. ima = efficiency =

The magnitude of the magnetic field at a certain distance from a long, straight conductor is represented by b. what is the magnitude of the magnetic field at twice the distance from the conductor? a. at twice the distance, the magnitude of the field is 4b.b. at twice the distance, the magnitude of the field is 2b.c. at twice the distance, the magnitude of the field is b/2.d. at twice the distance, the magnitude of the field is b/4.e. at twice the distance, the magnitude of the field remains equal to b.