Answer:
The new resistor has resistance of 9Ω.
Explanation:
The effective resistance of three resistance is
.
we know the the circuit with 9V battery has current of 3.6A; therefore, must be
,
which means
Now, Sally wants to connect another resistor in parallel so that the current becomes 4.6A. The resistance required for that is
.
which means the 4th resistor must satisfy the equation
and since
equation (2) becomes
which we solve for :
Thus, the resistance of the new resistor is 9 ohms.
Oml i literally answered this in class today XD it was C
Answer:
A closed organ pipe is λ/4 (node-antinode) long.
λ = speed / frequency = 331.5 / 259.6 = 1.28 m
λ/4 = .319 m length of closed pipe
An open pipe has a fundamental wavelength of A-N-A or λ/2
The second harmonic would be A-N-A-N-A or λ = 1.28 m for the second harmonic 331.5 / 259.6 = 1.28 (the fundamental would be 331.5 / .628
Temperature is a measurement of the average kinetic energy of an object’s molecules