midterm 1 Flashcards
when you’re unsure if a system is open/closed
f=n[v/L]
- this is what you use for solving for n
first harmonic
v = 2L
antinodes
- midpoint between 2 nodes
how far from either end does the first node occur?
ANS=L/n
Closed at both ends, then the wavelength cant’ be
greater than 2L
Which one of the following superpositions will result in beats?
the superposition of waves that are identical except for slightly different frequencies
What is the distance to the nearest antinode from the fixed end of a guitar string vibrating at its first harmonic?
wavelength/4
triangle question with two opposite charged rods
Tcostheta=Fe
Tsintheta=mg
At which point (or points) is the electric field zero N/C for the two point charges shown on the x axis?
The zero field point is outside the system, closer to the weaker charge.
When a glass rod is rubbed with silk cloth, the rod becomes positively charged as
negative charges are transferred from the rod to the silk.
Complete the following statement: When an ebonite rod is rubbed with animal fur, the rod becomes negatively charged as
negative charges are transferred from the fur to the rod.
which one of the following statements in true concerning the points on a string that sustain a standing wave pattern
- all points vibrate with the same frequency
which one of the following waves is purely longitudinal
- sound waves in air
string fixed at both ends, length of the string is
L=n(wavelength)/2
a charged insulator is brought near an uncharged conductor. Which one of the following statements is true?
- both objects will attract eachother
what is true about the magnitude of the electric field at a point in space
- it is a measure of the electric force per unit charge on a test charge
work done by the electric field when F is perpendicular
- electric field directed horizontally
- d directed vertically
= zero joules
