Search & Filtering
1. A deep sea ocean vessel uses SONAR to detect the ocean's bottom. Sound waves are emitted from the surface of the ocean and travel through the water at 1450 m/s. The ocean bottom is 1630 m below the surface. Determine the amount of time that passes before the sound waves are reflected back to the surface.
A. 1.12 s C. 0.89 s
B. 2.25 s D. 1.78 s
1. In general, the higher the frequency of the interfering waves,
A. the higher the wavelength C. the greater the number of nodes and antinodes B. the higher the speed of the waves D. the higher the amplitude of the waves
2. Which of the following materials should be use to make an ear protector against loud sound?
A. a material that produces sound C. a material that absorbs sound
B. a material that transmits sound D. a material that amplifies sound
1. The pattern of the standing wave is called the
A. Interference C. Antinode
B. Harmonic D. Node
2. Standing waves are created by
A. Two identical waves reflecting off each other
B. Two identical waves move through each other in opposite directions
C. Two identical waves being diffracted together
D. Two identical waves are diffracted from two identical sources
1. Birds can fly because air pressure is
A. greater above than below their wings.
B. the same on both sides of their wings.
C. greater below than above their wings.
D. transmitted through their wings.
2. Three containers are used in a chemistry lab. All containers have the same bottom area and the same height. A chemistry student fills each of the containers with the same liquid to the maximum volume. Which of the following is true about the pressure on the bottom in each container?
A. P1 > P2 > P3
B. P1 <P2 <P3
C. P1 <P2 >P3
D. P1 >P2 <P3
E. P1 =P2 =P3
- To increase pressure
A. Area of contact is increased C. Magnitude of thrust is decreased B. Area of contact is decreased D. None of these
2.What is the volume occupied by a kilogram of gold? (Recall that ρgold =2×104kg/m−3.)
A. 5×10−3 m3 C. 5×10−5 m3
B. 2×104 m3 D. 5×10−4 m3
3. The pressure of ocean water increases as the water
A. gets closer to shore C. gets shallower
B. becomes deeper D. two of the above
- Which statement is true?
A. For an ideal fluid flow, the greater the speed, the greater the pressure.
B. Atmospheric pressure decreases exponentially with increasing altitude.
C. Hydrostatic pressure exerted on a submerged object decreases with the depth of the object.
D. The pressure exerted at one point on a confined fluid at rest will decrease as it is transmitted to other parts of the fluid.
2.The difference between absolute pressure and atmospheric pressure is called
A. Air pressure C. gauge pressure
B. Barometric pressure D. hydrostatic Pressure
3. With the increase in the weight of an object the pressure
A. Increases C. remains the same
B. Decreases D. none of these
1. The density of a substance is 2500 kg/m3. What volume will 250 kg of this substance occupy?
A. 0.001 m3 C. 0.10 m3
B. 0.01 m3 D. 1.0 m3
2. In a typical hydraulic press, a force of 20 N is exerted on the small piston of area 0.050 m². The force exerted by the large piston on the load if it has an area of 0.50 m² will be
A. 200 N C. 50 N
B. 100 N D. 10 N
Consider the following situation׃ the force exerted on the small piston of a hydraulic lift is 160 N. The areas of the small piston and the large piston are 0.5 m2 and 1.0 m2, respectively.
1. What is the pressure exerted on the large piston?
A. 80 Pa C. 320 Pa
B. 160 Pa D. 640 Pa
2. What is the output force on the large piston?
A. 80 N C. 320 N
B. 160 N D. 640 N
3. Which term in Bernoulli’s theorem is referred to as the pressure head?
A. mgh C. v2/2g
B. P𝑚/𝜌 D. P/pg
obtain the equation of motion for Foucault pendulum
You can’t see clearly underwater with the naked eye, but you can if you wear a face mask or goggles (with air between your eyes and the mask or goggles). Why is there a difference? Could you instead wear eyeglasses (with water between your eyes and the eyeglasses) in order to see underwater? If so, should the lenses be converging or diverging? Explain.
