A quantity that is capable of producing motion or a change in motion is called a(n) ______________
Fill in the blank(s) with correct word
force
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Compound Microscope: The eyepiece of a compound microscope has a focal length of 2.50 cm, and the objective has a focal length of 1.60 cm. The two lenses are separated by 14.0 cm. The microscope is used by a person with normal eyes, having a near point at 25 cm. What is the magnitude of the magnification of the microscope?
A. 72 B. 88 C. 180 D. 219 E. 115
Suppose we observe a Cepheid variable in a distant galaxy. The Cepheid brightens and dims with a regular period of about 10 days. What can we learn from this observation?
A) It will allow us to calculate the rotation rate of the galaxy. B) It will allow us to determine the mass of the galaxy. C) We can learn the distance to the galaxy. D) Under the rules of the International Astronomical Union, we will be entitled to naming rights for the galaxy.
What do halo stars do differently from disk stars?
A) Halo stars orbit the galactic center with many different inclinations, while disk stars all orbit in nearly the same plane. B) Halo stars remain stationary, quite unlike disk stars that orbit the galactic center. C) Halo stars explode as supernovae much more frequently than disk stars. D) Halo stars orbit the center of the galaxy at much lower speeds than disk stars.
A current carrying loop of wire lies flat on a table top. When viewed from above, the current moves around the loop in a counterclockwise sense. (a) For points OUTSIDE the loop, the magnetic field caused by this current A
circles the loop in a clockwise direction. B) circles the loop in a counterclockwise direction. C) points straight up. D) points straight down. E) is zero. (b) For points INSIDE the loop, the magnetic field caused by this current A. circles the loop in a clockwise direction. B) circles the loop in a counterclockwise direction. C) points straight up. D) points straight down. E) is zero.