A point in the universe where the density of matter and the gravitational field are theoretically infinite is called a(n) ______________
Fill in the blank(s) with correct word
singularity
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Early astronomers believed that Earth did not move because they saw no ____, the apparent motion of an object because of the motion of the observer
a. uniform circular motion b. archeoastronomy c. heliocentrism d. eccentricity e. parallax
An ambulance is generating a siren sound at a frequency of 2,400 Hz. The velocity of sound is 345.0 m/s. If the observer is traveling at a velocity of 24.00 m/s toward the stationary ambulance, then what is the frequency of the siren perceived by the observer?
A. 2,640 Hz B. 2,567 Hz C. 2,520 Hz D. 2,508 Hz E. 2,475 Hz
An L-shaped metal machine part is made of two equal-length segments that are perpendicular to each other and carry a 4.50-A current as shown in the figure
This part has a total mass of 3.80 kg and a total length of 3.00 m, and it is in an external 1.20-T magnetic field that is oriented perpendicular to the plane of the part, as shown. What is the magnitude of the NET magnetic force that the field exerts on the part? A) 8.10 N B) 11.5 N C) 16.2 N D) 22.9 N E) 32.4 N
Magnification can be accomplished with a hologram when viewed with light that has a
A) longer wavelength than the original light. B) shorter wavelength than the original light. C) neither for holograms cannot be magnified.