Incompressible flow means that the fluid's density is constant
Indicate whether the statement is true or false
TRUE
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Which of the following statements correctly describes the relationship between stars and constellations?
a. Only stars close to the ecliptic (the Earth's orbital plane) are located in constellations. b. Every star is located in a constellation. c. Only the brighter stars are in constellations. d. Only those stars that were visible to the ancient Greeks are located in constellations.
Which ray passing through a thin lens does not change direction?
A. The ray going through the center of the lens. B. The ray parallel to the optical axis. C. Any ray coming from the focal point. D. All outgoing rays are deflected relative to the incoming rays.
A block lies on a horizontal frictionless surface. A horizontal force of 100 N is applied to the block giving rise to an acceleration of 3.0 m/s2
(a) Determine the mass of the block. (b) Calculate the distance the block will travel if the force is applied for 10 s. (c) Calculate the speed of the block after the force has been applied for 10 s. What will be an ideal response?
If we know the average separation and period of revolution for a binary system, we can then measure
A) the actual luminosity of each star. B) the actual mass of both individual stars. C) their absolute magnitudes. D) the actual sizes of the two stars. E) the total mass of the system.