Physics Force & Laws Of Motion Level: Misc Level
A BMW of mass 1.5 x 10 3 kg is traveling at 44 m /s. It approaches a 1.1 x 10 3 kg Volkswagen going 23 m/s in the same direction and strikes it in the rear. Neither driver applies the brakes. Neglect the relatively small frictional forces on the cars due to the road and due to air resistance. If the collision slows the BMW down to 34 m/s, what is the speed of the VW after the collision?
Physics Force & Laws Of Motion Level: Misc Level
A toy car with a mass of 120 g moves to the right with a speed of 0.65 m /s. A small child drops a 32.0 g piece of clay onto the car. The clay sticks to the car and the car continues to the right. What is the change in speed of the car? Consider the frictional force between the car and the ground to be negligible.
Physics Kinematics Level: Misc Level
Consider two falling bodies. Their masses are 4.2 kg and 6.6 kg. At time t =0, the two are released from rest. What is the velocity of their center of mass at t = 4.0 s? lgnore air resistance.
Physics Rotational Mechanics Level: Misc Level
The positions of three particles, written as ( x, y ) coordinates, are: particle 1 ( mass 4.3 kg ) at ( 3.5 m, 0 m ): particle 2 ( mass 5,7 kg ) at ( 2.1 m, 4.5 m,): particle 3 ( mass 3.4 kg ) at ( -1.1 m, -1.9 m). What is the location of the center of mass?
x cm= m
y cm =m
Physics Work,Power & Energy Level: Misc Level
A man with a mass of 55 kg skis down a frictionless hill that is 2.1 m high. At the bottom of the hill the terrain levels out. As the man reaches the horizontal section, he grabs a 20 kg backpack and skis off a 2.0 m high ledge. At what horizontal distance from the edge of the ledge the man land?
Physics Force & Laws Of Motion Level: Misc Level
A submaringe of mass 2.1 x 10 6 kg and initially at rest fires a torpedo of mass 260 kg. The torpedo has an initial speed of 100.8 m/s. What is the initial recoil speed of the submarine? Neglect the drag force of the water.
Physics Wave Optics Level: Misc Level
Explain the polarization of light, using examples to help with your explanation.
Physics Properties Of Matter Level: Misc Level
Explain the difference in molecular behavior for molecules in a solid compared each of molecules in a liquid and molecules in a gas. Assume that all three are at the same temperature.
Physics Wave Optics Level: Misc Level
Consider two diffraction gratings with the same slit separation, the only difference being that one grating has 3 slits and the other 4 slits. If both gratings are illuminated with a beam of the same monochromatic light, both gratings produce the same separation between orders, but the orders are better defined with the 4- slit grating.
the grating with 4 slits produces the greater separation between orders.
both gratings produce the same separation between orders.
the grating with 3 slits produces the greater separation between orders.
Physics Ray Optics Level: Misc Level
We have seen that two monochromatic light waves can interfere constructively or destructively, depending on their phase difference. One consequence of this phenomena is
the way in which polaroid sunglasses work.
a rainbow.
the colors you see when white light is reflected from a soap bubble.
the appearance of a mirage in the desert.
the formation of an image by a converging lens, such as the lens in your eye.
Physics Ray Optics Level: Misc Level
A convex lens is placed on a flat glass plate and illuminated from above with monochromatic red light. When viewed from above, concentric bands of red and dark are observed. What does one observe at the exact center of the lens where the lens and the glass plate are in direct contact?
A rainbow of color
A dark spot
A bright red spot
A bright spot that is some color other than red
Physics Wave Optics Level: Misc Level
Consider an oil film ( n = 1.50 ) on water ( n =1.33 ) and light of wavelength 600 nm in air, incident on the film. The minimum film thickness for constructive interference of the light in air is:
113. nm
100. nm
200. nm
150. nm
Physics Wave Optics Level: Misc Level
For a beam of light, the direction of polarization is defined as
the direction of the electric fields vibration.
the beam s direction of travel.
the direction that is mutually perpendicular to the electric and magnetic field vectors.
the direction of the magnetic field s vibration.
Physics Wave Optics Level: Misc Level
Assuming that I is the wavelength of light in oil, for an oil film on water, constructive interference with the minimum film thickness of:
I /4
I /2
I
2 I
Physics Wave Optics Level: Misc Level
If two light waves are coherent, which of the following is NOT necessary?
They must have a constant phase difference at every point in space.
They must have the same amplitude.
They must have the same frequency.
They must have the same velocity.
They must have the same wavelength.
