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1.A truck and an ambulance move at the same rate of 13 m/s toward each other but on different lanes. If the ambulance siren emits sound of frequency 1200 Hz, what is the frequency of the sound that the truck driver hears?
2. The police car is moving toward a warehouse at 30 m/s. If the police car is emitting a 1kHz sound, what frequency does the driver hear reflected from the warehouse? Assume that the speed of sound is 340 m/s.
3. What is the frequency heard by a person driving at 15 m/s toward a factory whistle that is blowing at a frequency of 800 Hz? Assume that the speed of sound is 340 m/s
1. A police car’s siren emits a sinusoidal wave with frequency of 300 Hz. The speed of sound is 340 m/s and the air is still.
a.) If a listener is at rest and the siren is moving away at 30 m/s, what frequency does the listener hear?
b.) If the siren is at rest and the listener is moving away from it at 30 m/s, what frequency does the listener hear?
2. The siren is moving away from the listener with a speed of 45 m/s relative to the air, and the listener is moving toward the siren with a speed of 15 m/s relative to the air. If the siren is emitting a 1kHz sound, what frequency does the listener hear?
A. What is the relationship between liquid pressure and the depth of a liquid? Between liquid pressure and density?
B. If you swim beneath the surface in salt water, will the pressure be greater than in freshwater at the same depth? Why or why not?
C. Why does buoyant force act upward on an object submerged in water?
D. Fill in the blanks: An object denser than water will _ in water. An object less dense than water will _ in water. An object with the same density of water will _ in water.
E. Why do airplane wings have curved upper portion?
F. How does Bernoulli's principle apply to the flight of airplanes?
G. What happens to the pressure in all parts of a confined fluid if the pressure in one part is increased?
If a piece of photographic film is placed at the location of a real image, the film will record
the image. Can this be done with a virtual image? How might one record a virtual image?
A spherical air bubble in water can function as a lens. Is it a converging or diverging lens? How is its focal length related to its radius?
On a very hot day in Manila, an oil tanker loaded 50,000 liters of fuel. It traveled to Baguio, which was 20 K colder than Manila. How many liters where delivered to Baguio? (𝛽𝑔𝑎𝑠𝑜𝑙𝑖𝑛𝑒=0.95 𝑥 10−3)
Using the equation for acceleration due to gravity (g), compute the
approximate value of acceleration due to gravity with the given values: mass of Earth = 6.0 x 10^24kg and radius of Earth = 6.37 x 10^6 m. Compare the value you had with the
acceleration due to gravity we use which is 9.8 m/s^2
Complete solution
1. Copper shot (0.100 kg) is heated in boiling oil. After this, it is submerged in old water (0.300 kg at 20 ºC). If the water’s temperature turned 23.0 ºC, what was the temperature of the hot oil?
2. What is the new length of a bar made of pure gold at 75 ºC if it has a length 0.3 meters at 10 º C?
3.At what temperature will the Celsius and Fahrenheit scale have the same value?
By how much will this area (in square decimeters) increase during a hot summer day on the month of May when the temperature is 120.20F?
When a T. rex pursues a jeep in the movie Jurassic Park, we see a reflected image of the T. rex via a side-view mirror, on which is printed the (then darkly humorous) warning: “Objects in mirror are closer than they appear.” Is the mirror flat, convex, or concave?
#340153 on Dec 2023