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1.a. What are the three longest wavelengths for standing waves on a 240 cm long string that is fixed at both ends?
b. If the frequency of the second longest wavelength is 50 Hz, what is the frequency of the third longest wavelength?
2. A sheet of glass is coated with 500 nm thick layer of oil (n = 1.42).
a. for what visible wavelengths of light do the reflected waves interfere constructively?
b. for what visible wavelengths of light do the reflected waves interfere destructively?
c. what is the color of the reflected light and transmitted light?
3. You are standing 2.5 m directly in front of one the two loud speakers shown in Figure. They are 3.0 m apart and both are playing a 686 Hz tone in phase. As you begin to walk from away from the speaker, at what distances from the speaker do you hear a minimum sound intensity. The room temperature is 20 oC.
Contrast the center of gravity (CG) and center of mass (CM) of the moon. (Suppose the moon is spherical and centered means the center point of the sphere)
If you lie on the ground at night with no cover, you get cold rather quickly. Much of this is due to energy loss by radiation. At night in a dry climate, Estimate the net rate at which your body loses energy by radiation to the night sky under thes..
what is the weight of sea water displaced by a boat weighing 120kN? d=1300 Kg/m^3 what is the volume of the sea water displaced by the boat
measure the displacement,
The total electric field consists of the vector sum of two parts. One part has a magnitude of E1 = 1300 N/C, Find the magnitude and direction of the total field
Suppose one gallon of gasoline produces 1.1 108 J of energy, and this energy is sufficient to operate a car for 43 miles. how many miles would the car go on a single tablet
the two sides of the dna double helix are connected by pairs of bases adenine thymine cytosine and guanine. because of
You have a battery marked "6.00 V." When you draw a current of 0.223 A from it, the potential difference between its terminals is 5.01 V. What is the potential difference when you draw 0.537 A
As you ride in the Ferris wheel, your apparent weight is different at the top than at the bottom. How many seconds does it take to complete one revolution
Light enters a substance glass using a converging lens with a refractive power of 20 diopters. Find the magnification if the image is to be viewed by a relaxed eye with a near point of 25 centimeter
A particle falls in Earth's gravity. The force of air resistance is F = ??v v(bold) where v(bold) is the velocity, v is the speed, Suppose the initial velocity is 0. How far has the object fallen when the speed is one-half the terminal speed
a sound wave traveling in 26 degrees C air has a pressure amplitude of 0.500 Pa. (assume that the density of air is 1.29 kg/m^3). What is the intensity of the wave
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