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  1. B

    Light again

    A ray of light strikes a flat block of glass (n=1.5) of thickness 2.0 cm at an angle of 30 degrees with the normal. Find the distance the light is shifted. I found the angle of refraction to be 19.471 degrees. I figured I could find the horizontal distance travelled by rays going through at...
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    Light and refraction in water

    Could someone tell me if I did this right? A narrow beam of sodium yellow light, with wavelength 589 nm in vacuum, is incident from air onto a smooth water surface at an angle of incidence of 35.0 degrees. Determine the angle of refraction and the wavelength of the light in water. I did...
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    Determine the final temperature of the mixture homework

    A combination of 0.250 kg of water at 20*C, 0.400 kg of aluminum at 26.0*C, and 0.100 kg of copper at 100*C is mixed in an insulated container and allowed to come to thermal equilibrium. Ignore any energy transfer to or from the container and determine the final temperature of the mixture. I...
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    What is the distance between the cliffs?

    A cowboy stands on horizontal ground between two parallel vertical cliffs. He is not midway between the cliffs. He fires a shot and heras its echoes. The second echo arrives 1.92 s after the first and 1.47 s before the third. Consider only the sound traveling parallel to the ground and...
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    Simple Harmonic Motion of a horizontal spring

    A 1.00-kg object is attached to a horizontal spring. The spring is initially stretched by 0.100 m, and the object is released from rest there. It proceeds to move without friction. The next time the speed of the object is zero is 0.500 s later. What is the maximum speed of the object? I...
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    Simple Harmonic Motion of a car's tires

    While riding behind a car traveling at 3.00 m/s, you notice that one of the car's tires has a small hemispherical bump on it's rim. If the radii of the car's tires are .300 m, what is the bump's period of oscillation? Can anyone tell me where to start with this? I'm actually not even sure...
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    Calculation of Moments of Inertia

    A uniform thin solid door has height 2.20 m, width .870 m, and mass 23.0 kg. Find its moment of inertia for rotation on its hinges. Is any piece of data unnecessary? So far, I don't understand how to calculate moments of inertia for things like this at all. I can do a system of particles...
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    Two-Dimensional Collisions

    The mass of the blue puck in the figure is 20.0% greater than the mass of the green one. Before colliding the, the pucks approach each other with momenta of equal magnitudes and opposite directions, and the green puck has an initial speed of 10.0 m/s. Find the speeds of the pucks after the...
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    Two-Dimensional Collisions

    Two shuffleboard disks of equal mass, one orange and the other yellow, are involved in an elastic, glancing collision. The yellow disk is initially at rest and is struck by the orange disk moving with a speed of 5.00 m/s. After the collision, the orange disk moves along a direction that makes...
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    Changes in Mechanical Energy for Nonconservative Forces

    I have a problem for the subject in the title. I'm not really sure where to start, and I can't figure it out. In her hand a softball pitcher swings a ball of mass .250 kg around a vertical circular path of radius 60.0 cm before releasing it from her hand. The pitcher maintains a component...
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    Volumes by Cylindrical Shells

    Hi, I was hoping someone could check my work on a few problems and get me started on a few others. It involves definite integration, so I'm gonna use (a,b)S as an integration symbol and P for pi. These are the ones I need checked: 1. Use cylindrical shells to find the volume of the solid...
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