Download Last Name - Saint Demetrios Astoria School

Practice-Midterm
St. Demetrios Greek - American School
30-03 30th Drive
Astoria, N.Y. 11102
Principal: Mr. Koularmanis
Last Name:
Course: Physics II
First Name:
Mr. Balkan
Class:
Date:
Electrostatice Force:
Determine the electrical force of attraction between two balloons which are charged with
the opposite type of charge but the same quantity of charge. The charge on the balloons is
6.0 x 10-7 C and they are separated by a distance of 0.50 m.
1) Sphere A and B are oppositely charged of 2.4 μC separated by a distance of 0.50
meter.
a) Draw an electric field lines between Sphere A and B. Show the arrowhead on each field line for
direction.
b) Calculate the magnitude of the electric force that sphere A exerts on sphere B.
2) Calculate the magnitude of the electric field strength at a point in a field where an
electron experiences a force with a magnitude of 1.0 Newton.
Electricity:
3)
Three resistors, 60 Ω, 30 Ω, and 20 Ω, are connected in a series across a 90 V battery.
a) Draw the circuit diagram.
b) Find the current through the entire circuit.
c) Find the voltage drop through each resistor.
d) Find the equivalent resistance of the circuit.
4) A potential difference of 60 V is applied across a 15Ω resistor.
a) Calculate the power dissipated in the resistor.
b) What is the current?
5) R1 and R2 are 4 Ω each, connected in parallel to a 60 V battery source through two
resistors that are in series, R3= 4 Ω and R4= 6 Ω.
a) Draw the schematic.
b) Find RTotal (Req).
c) Find I1, I2, I3, I4
d) Find the voltage drop at R1, R2,R3, R4
Waves:
Based your answers to questions 1 and 2 on the information below.
One end of a rope is attached to avariable speed drill and the other end is attached
to a 5.0 kg mass. The rope is draped over a hook on a wall opposite the drill. When the
drill rotates at a frequency of 20.0 Hz, standing waves of the same frequency are set up in
the rop. The diagram below shows such a wave pattern.
QuickTime™ and a
TIFF (LZW) decompressor
are needed to see this picture.
1)
Determine the wavelength of the waves producing the standing wave pattern.
2)
Calculate the speed of the wave in the rope.
3)
If the wavelength of a 4.40 x 102 Hz sound in freshwater is 3.30 m, what is the
speed of sound in water?
4)
Sound with a frequency of 261.6 Hz travels through water at a speed of 1435
m/s. Find the sound’s wavelength in water.
5)
The vertical lines in the diagram below represent compressions in a sound wave
of constant frequency propagating to the right from a speaker toward an
observer at point A.
QuickTime™ and a
TIFF (LZW) decompressor
are needed to see this picture.
The speaker is then moved towards the observer at A.
a) Compare the wavelength of the sound wave received by the observer while the
speaker is moving to the wavelength observed when speaker was at rest.
b) What phenomena is this effect called?
Magnetism:
Characteristics of magnetism
Polarity
Magnetic field
Light:
A ray of monochromatic light having a frequency of 5.09 x 1014 Hertz is incident
on an interface of air and corn at an angle of 35 degrees as shown below. The ray is
transmitted through parallel layers of corn oil and glycerol and is then reflected from the
surface of a plane mirror, located below and parallel to the glycerol layer. The ray then
emerges from the corn oil back into the air at point P.
QuickTime™ and a
decompressor
are needed to see this picture.
a. Calculate the angle of refraction of the light ray as it enters the corn oil from
air.
b. Explain why the ray does not bend at the corn oil-glycerol interface.
1) A light ray striking the boundary between air and medium X. The angle of incidence
in air is 55 degrees and the angle of refraction is 19.8 degrees in medium X.
a. Calculate the absolute index of refraction of medium X.
b. What would be the angle between this light ray and its reflected ray?
c. Medium X is most likely what material?
d. Draw the ray of incidence, reflection, refraction and its appropriate angles.
c. On the diagram, use a protractor to construct the refracted ray representing the
light emerging at point P into air.
Modern Physics:
Base your answers to questions 1 through 4, a mercury atom emits a photon from an
energy level of h to b
1) Determine the energy in electronvolts that is given off in this transition.
2) Determine the energy in joules from question 17.
3) Calculate the frequency of the radiation corresponding to the emitted photon.
4) Calculate the wavelength of the radiation corresponding to the emitted photon.