Ascientist uses different types of gasoline in the engines of three identical
cars. she measures how far the cars go before running out of gas. what is
the dependent variable in this experiment?

The distance the cars travel.

Explanation:

The independent variable is the one you change. In this case, the scientist is changing the type of gasoline used. Therefore, the type of gasoline is the independent variable.

The dependent variable is the variable that changes as a result of (or depending on) the change in the independent variable. In this case, that is the distance the car travels before running out of gas.

a solenoid is created by wrapping a l = 90 m long wire around a hollow tube of diameter d = 4.5 cm.   the wire diameter is d = 0.9 mm.   the solenoid wire is then connected to a power supply so that a current of i = 9 a flows through the wire.

randomized variablesl = 90 m

d = 4.5 cm

d = 0.9 mm

i = 9 a                                          

write an expression for the number of turns, n, in the solenoid. you do not need to take into account the diameter of the wire in this calculation.

calculate the number of turns, n, in the solenoid.

write an expression for the length of the solenoid (l2) in terms of the diameter of the hollow tube d.

calculate the length of the solenoid (l2)   in meters.

calculate the magnitude of the magnetic field at the center of the solenoid in teslas.

explanation:

powerful computers now, not then