Which of the following would decrease the magnification of a compound microscope?
a. Replacing the objective lens with one of larger diameter.
b. Replacing the eyepiece lens with one of shorter focal length.
c. Replacing the eyepiece lens with one of smaller diameter.
d. Replacing the objective lens with one of longer focal length.
D
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A ball rolls over the edge of a table with a horizontal velocity v m/s. The height of the table is 1.6 m and the horizontal range of the ball from the base of the table is 20 m. What is the initial speed of the ball?
A) 9.8 m/s B) 20 m/s C) 35 m/s D) 4.9 m/s E) 70 m/s
A 2.00-m rod of negligible mass connects two small objects. The mass of one object is 1.00 kg and the other is 1.50 kg. How far is the center of mass of this system from the 1.00 kg mass?
A) 0.800 m B) 0.670 m C) 1.25 m D) 1.33 m E) 1.20 m
What is the main energy transformation (input and useful output) for a person speeding up while riding a bicycle?
A) kinetic E ? chemical E B) thermal E ? kinetic E C) chemical E ? elastic E D) elastic E ? kinetic E E) chemical E ? kinetic E
Sunspots:
A) are always found close to the Sun's poles. B) come in pairs, representing the north and south magnetic fields. C) were most numerous during the Maunder Minimum. D) travel over the surface of the Sun from pole to pole. E) are relatively constant in number every year.