The device employed to measure the diameters of stars and our galaxy (Milky Way) is called:a)Photometerb)Barometerc)Viscometerd)InterferometerCorrect answer is option 'D'. Can you explain this answer?

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ACT Exam > ACT Questions > The device employed to measure the diameters ...

The device employed to measure the diameters of stars and our galaxy (Milky Way) is called:

a)
Photometer
b)
Barometer
c)
Viscometer
d)
Interferometer

Correct answer is option 'D'. Can you explain this answer?

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The device employed to measure the diameters of stars and our galaxy (...

The device employed to measure the diameters of stars and our galaxy (Milky Way) is called an interferometer. So, the correct answer is (d) Interferometer. Interferometry is a technique that utilizes the interference of waves to make precise measurements of distances or sizes, particularly in astronomy. By combining the light from different telescopes or using multiple paths of light, interferometers can achieve very high resolution, allowing astronomers to measure the diameters of distant stars and galaxies.

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Directions:Read the passages and choose the best answer to each question.PassageNear the end of the 19th century, British engineer Osborne Reynolds ran a set of experiments to observe and predict the transition between laminar (steady) and turbulent ﬂow of a liquid through a pipe. In Reynolds’ experiments, dye was forced through a liquid to show visually when the ﬂow changed from laminar to turbulent. Laminar ﬂow is common only in cases in which the ﬂow channel is relatively small, the ﬂuid is moving slowly, and its viscosity (the degree to which a ﬂuid resists ﬂow under an applied forc e) is relatively high. In turbulent ﬂow, the speed of the ﬂuid at any given point is continuously undergoing changes in both magnitude and direction. Reynolds demonstrated that the transition from laminar to turbulent ﬂow in a pipe depends upon the value of a mathematical quantity equal to the velocity of ﬂow (V ) times the diameter of the tube (D) times the mass density (ρ) of the ﬂuid divided by its absolute viscosity (µ). The “Reynolds number,” as it is called, is determined by the following equation:Several students designed similar experiments to observe ﬂow rates of different liquids. To conduct the experiments, the students were given the following apparatus: Liquid supply tank with clear test section tube and ‘bell mouth’ entrance 1 Rotameter to measure the velocity of ﬂow (ﬂow rate) Tap water • Motor oil 4, 10-ft long smooth pipes of various diameters: 0.25-inch, 0.50-inch, 0.75-inch, 1.0-inchFigure 1 illustrates an approximation of the set-up of each experiment.Figure 2 shows approximate viscosities of the water and motor oils used in the experiments.Experiment 1In Experiment 1, students began with a pipe of diameter 0.25 inches. The pipe was set first at a 15° angle and tap water was released steadily from the tank into the pipe. The velocity of flow (V) was measured. The pipe was then set at a 30° angle, a 45° angle, and a 60° angle, water was released steadily from the tank into the pipe, and the velocity of flow was measured. The process was then repeated for each diameter of pipe using the same amount of water each time. All data were recorded in Table 1. Temperature of the water was held constant at 20°C.Experiment 2In the second experiment, the tap water was replaced by Motor Oil A and the processes were repeated. The results are given in Table 2.Experiment 3In a third experiment, the tap water was replaced by Motor Oil B and the processes were repeated.Q.According to the passage, laminar ﬂow was most likely to be observed under which of the following conditions?

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Directions:Read the passages and choose the best answer to each question.PassageNear the end of the 19th century, British engineer Osborne Reynolds ran a set of experiments to observe and predict the transition between laminar (steady) and turbulent ﬂow of a liquid through a pipe. In Reynolds’ experiments, dye was forced through a liquid to show visually when the ﬂow changed from laminar to turbulent. Laminar ﬂow is common only in cases in which the ﬂow channel is relatively small, the ﬂuid is moving slowly, and its viscosity (the degree to which a ﬂuid resists ﬂow under an applied forc e) is relatively high. In turbulent ﬂow, the speed of the ﬂuid at any given point is continuously undergoing changes in both magnitude and direction. Reynolds demonstrated that the transition from laminar to turbulent ﬂow in a pipe depends upon the value of a mathematical quantity equal to the velocity of ﬂow (V ) times the diameter of the tube (D) times the mass density (ρ) of the ﬂuid divided by its absolute viscosity (µ). The “Reynolds number,” as it is called, is determined by the following equation:Several students designed similar experiments to observe ﬂow rates of different liquids. To conduct the experiments, the students were given the following apparatus: Liquid supply tank with clear test section tube and ‘bell mouth’ entrance 1 Rotameter to measure the velocity of ﬂow (ﬂow rate) Tap water • Motor oil 4, 10-ft long smooth pipes of various diameters: 0.25-inch, 0.50-inch, 0.75-inch, 1.0-inchFigure 1 illustrates an approximation of the set-up of each experiment.Figure 2 shows approximate viscosities of the water and motor oils used in the experiments.Experiment 1In Experiment 1, students began with a pipe of diameter 0.25 inches. The pipe was set first at a 15° angle and tap water was released steadily from the tank into the pipe. The velocity of flow (V) was measured. The pipe was then set at a 30° angle, a 45° angle, and a 60° angle, water was released steadily from the tank into the pipe, and the velocity of flow was measured. The process was then repeated for each diameter of pipe using the same amount of water each time. All data were recorded in Table 1. Temperature of the water was held constant at 20°C.Experiment 2In the second experiment, the tap water was replaced by Motor Oil A and the processes were repeated. The results are given in Table 2.Experiment 3In a third experiment, the tap water was replaced by Motor Oil B and the processes were repeated.Q. In Experiment 1, at a 30° angle, flow rate would most likely have been approximately 6.0 ft/s for which new pipe diameter?

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Directions:Read the passages and choose the best answer to each question.PassageNear the end of the 19th century, British engineer Osborne Reynolds ran a set of experiments to observe and predict the transition between laminar (steady) and turbulent ﬂow of a liquid through a pipe. In Reynolds’ experiments, dye was forced through a liquid to show visually when the ﬂow changed from laminar to turbulent. Laminar ﬂow is common only in cases in which the ﬂow channel is relatively small, the ﬂuid is moving slowly, and its viscosity (the degree to which a ﬂuid resists ﬂow under an applied forc e) is relatively high. In turbulent ﬂow, the speed of the ﬂuid at any given point is continuously undergoing changes in both magnitude and direction. Reynolds demonstrated that the transition from laminar to turbulent ﬂow in a pipe depends upon the value of a mathematical quantity equal to the velocity of ﬂow (V ) times the diameter of the tube (D) times the mass density (ρ) of the ﬂuid divided by its absolute viscosity (µ). The “Reynolds number,” as it is called, is determined by the following equation:Several students designed similar experiments to observe ﬂow rates of different liquids. To conduct the experiments, the students were given the following apparatus: Liquid supply tank with clear test section tube and ‘bell mouth’ entrance 1 Rotameter to measure the velocity of ﬂow (ﬂow rate) Tap water • Motor oil 4, 10-ft long smooth pipes of various diameters: 0.25-inch, 0.50-inch, 0.75-inch, 1.0-inchFigure 1 illustrates an approximation of the set-up of each experiment.Figure 2 shows approximate viscosities of the water and motor oils used in the experiments.Experiment 1In Experiment 1, students began with a pipe of diameter 0.25 inches. The pipe was set first at a 15° angle and tap water was released steadily from the tank into the pipe. The velocity of flow (V) was measured. The pipe was then set at a 30° angle, a 45° angle, and a 60° angle, water was released steadily from the tank into the pipe, and the velocity of flow was measured. The process was then repeated for each diameter of pipe using the same amount of water each time. All data were recorded in Table 1. Temperature of the water was held constant at 20°C.Experiment 2In the second experiment, the tap water was replaced by Motor Oil A and the processes were repeated. The results are given in Table 2.Experiment 3In a third experiment, the tap water was replaced by Motor Oil B and the processes were repeated.Q.Which of the following conclusions is best supported by information in the passage? As viscosity increases

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Directions:Read the passages and choose the best answer to each question.PassageNear the end of the 19th century, British engineer Osborne Reynolds ran a set of experiments to observe and predict the transition between laminar (steady) and turbulent ﬂow of a liquid through a pipe. In Reynolds’ experiments, dye was forced through a liquid to show visually when the ﬂow changed from laminar to turbulent. Laminar ﬂow is common only in cases in which the ﬂow channel is relatively small, the ﬂuid is moving slowly, and its viscosity (the degree to which a ﬂuid resists ﬂow under an applied forc e) is relatively high. In turbulent ﬂow, the speed of the ﬂuid at any given point is continuously undergoing changes in both magnitude and direction. Reynolds demonstrated that the transition from laminar to turbulent ﬂow in a pipe depends upon the value of a mathematical quantity equal to the velocity of ﬂow (V ) times the diameter of the tube (D) times the mass density (ρ) of the ﬂuid divided by its absolute viscosity (µ). The “Reynolds number,” as it is called, is determined by the following equation:Several students designed similar experiments to observe ﬂow rates of different liquids. To conduct the experiments, the students were given the following apparatus: Liquid supply tank with clear test section tube and ‘bell mouth’ entrance 1 Rotameter to measure the velocity of ﬂow (ﬂow rate) Tap water • Motor oil 4, 10-ft long smooth pipes of various diameters: 0.25-inch, 0.50-inch, 0.75-inch, 1.0-inchFigure 1 illustrates an approximation of the set-up of each experiment.Figure 2 shows approximate viscosities of the water and motor oils used in the experiments.Experiment 1In Experiment 1, students began with a pipe of diameter 0.25 inches. The pipe was set first at a 15° angle and tap water was released steadily from the tank into the pipe. The velocity of flow (V) was measured. The pipe was then set at a 30° angle, a 45° angle, and a 60° angle, water was released steadily from the tank into the pipe, and the velocity of flow was measured. The process was then repeated for each diameter of pipe using the same amount of water each time. All data were recorded in Table 1. Temperature of the water was held constant at 20°C.Experiment 2In the second experiment, the tap water was replaced by Motor Oil A and the processes were repeated. The results are given in Table 2.Experiment 3In a third experiment, the tap water was replaced by Motor Oil B and the processes were repeated.Q.All of the experimental factors were identical EXCEPT

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Directions:Read the passages and choose the best answer to each question.PassageNear the end of the 19th century, British engineer Osborne Reynolds ran a set of experiments to observe and predict the transition between laminar (steady) and turbulent ﬂow of a liquid through a pipe. In Reynolds’ experiments, dye was forced through a liquid to show visually when the ﬂow changed from laminar to turbulent. Laminar ﬂow is common only in cases in which the ﬂow channel is relatively small, the ﬂuid is moving slowly, and its viscosity (the degree to which a ﬂuid resists ﬂow under an applied forc e) is relatively high. In turbulent ﬂow, the speed of the ﬂuid at any given point is continuously undergoing changes in both magnitude and direction. Reynolds demonstrated that the transition from laminar to turbulent ﬂow in a pipe depends upon the value of a mathematical quantity equal to the velocity of ﬂow (V ) times the diameter of the tube (D) times the mass density (ρ) of the ﬂuid divided by its absolute viscosity (µ). The “Reynolds number,” as it is called, is determined by the following equation:Several students designed similar experiments to observe ﬂow rates of different liquids. To conduct the experiments, the students were given the following apparatus: Liquid supply tank with clear test section tube and ‘bell mouth’ entrance 1 Rotameter to measure the velocity of ﬂow (ﬂow rate) Tap water • Motor oil 4, 10-ft long smooth pipes of various diameters: 0.25-inch, 0.50-inch, 0.75-inch, 1.0-inchFigure 1 illustrates an approximation of the set-up of each experiment.Figure 2 shows approximate viscosities of the water and motor oils used in the experiments.Experiment 1In Experiment 1, students began with a pipe of diameter 0.25 inches. The pipe was set first at a 15° angle and tap water was released steadily from the tank into the pipe. The velocity of flow (V) was measured. The pipe was then set at a 30° angle, a 45° angle, and a 60° angle, water was released steadily from the tank into the pipe, and the velocity of flow was measured. The process was then repeated for each diameter of pipe using the same amount of water each time. All data were recorded in Table 1. Temperature of the water was held constant at 20°C.Experiment 2In the second experiment, the tap water was replaced by Motor Oil A and the processes were repeated. The results are given in Table 2.Experiment 3In a third experiment, the tap water was replaced by Motor Oil B and the processes were repeated.Q.Based on Experiment 1, the relationship between the angle of the pipe and the velocity of ﬂow

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