A bat uses echolocation to identify objects. A bat is traveling to west emits a sound (also heading towards the west) to a stationary object. Which of the following is most accurate in regards to the Doppler effect?
Answer(s): B
This is characteristic of the Doppler effect. If 2 objects are approaching another, or if one is stationary and the other is approaching the object, then the received frequency will be higher than the emitted frequency.
A man lifts a 200 lb rock from the floor to a height 6 feet of the ground. How much work must the man perform in order to keep the object in the air?
Answer(s): C
Work = Force × Distance. Because the question asks about the work performed to keep the rock above the man, the rock is not being displaced, and thus, no work is being done as displacement = 0. Work is only being done in reference to the actual displacement movement. Be careful for questions that give you meaningless information in relation to the answer.
A circuit contains a 2Ω and a 5Ω resistor, connected in parallel to each other. What is the equivalent resistance in this circuit?
Answer(s): D
Resistors in parallel add via: 1/Req = 1/R + 1/R… 1/Req = 1/2 + 1/5 Finding a common denominator: 5/10 + 2/10 = 7/10 = 1/Req Flipping it to attain Req = 10/7Ω
A cannon is fired at an angle of 30° above the ground, with an initial velocity of 100 m/s. How long will it take for the cannon ball to hit the ground assuming there is no air resistance?
Answer(s): A
Visualize the problem as a vector, and find the y component of it: 100 m/s × sin30 = 50 m/s. This means the cannon traveled 50 meters up, and 50 meters down in the y direction. Gravity is 10 m/s2, thus it took 5 seconds to go up, and another 5 seconds to go down, totaling an air time of 10 seconds.
A helicopter shines its light into the ocean at an incidence angle of 30°. What is the angle of reflection?Assume index of refraction is n = 1.33 for water and n = 1 for air.
This is a conceptual question that provides additional information to throw you off. Angle of incidence = Angle of reflection.
Rank the following in ascending order of wavelength magnitude:I)Gamma rays II)X-Rays III)Visible light IV. Radio waves
The energy and frequency increases from Radio waves –> Microwaves –> IR –> Visible light –> UV –> X-Rays –> Gamma rays.But wavelength increases inversely, starting from Gamma rays (having the smallest wavelengths) to Radio waves (having the largest wavelengths)
A wire of resistance R is about to be replaced with a different wire that is three times as long and having a radius three times as much as the original wire. What is the resistance of this new wire?
The resistance formula is R = p(L/A); where p = resistivity, L = length and r = radius. Tripling the length gives 3L, whereas tripling the radius would make the area 9x as big (A = 2pi × r2). Thus, you would end up with a ratio of 3/9, which is 1/3 the resistance of the new wire.
A manometer filled with mercury has a higher pressure on the open end, with a difference of 380 mm in the height of the fluid. What is the pressure of the gas in there?
In manometers filled with mercury (Hg), the difference in height of the fluid is equivalent to the difference in pressure. There is a difference in 380 mmHg between the pressure inside and outside, which is half of the atmospheric pressure of 760 mmHg, or 1 atm. 1 atm is roughly 100,000 Pa, so the pressure inside is 50,000 Pa.
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