Friction: A bulldozer attempts to drag a log weighing 500 N along the rough horizontal ground. The cable attached to the log makes an angle of 30° above the ground. The coefficient of static friction between the log and the ground is 0.50, and the coefficient of kinetic friction is 0.35. What minimum tension is required in the cable in order for the log to begin to slide?
Fill in the blank(s) with the appropriate word(s).
220 N
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The Muslim fast of Ramadan occurs
A) during the ninth month of a 12-month lunar cycle. B) on the summer solstice. C) during a thirteenth month of the Metonic cycle. D) at the end of the Metonic cycle. E) on the spring equinox.
The distance between the object to be viewed and the eyepiece of a compound microscope is 18.0 cm. The focal length of its objective lens is 0.80 cm and the eyepiece has a focal length of 2.3 cm
The near-point distance of the person using the microscope is 25.0 cm. What is the magnitude of the total magnification of the microscope if it is designed for minimum eyestrain? A) 480 B) 120 C) 184 D) 200 E) 360
A hair is placed at one edge between two flat glass plates. When this arrangement is illuminated with yellow light of wavelength (l = 600 nm), a total of 61 dark bands are counted starting at the point of contact between the plates. How thick is the hair? (1 nm = 10-9 m) Note that a dark band occurs where the plates contact
a. 3.6 × 10^-4 m c. 1.8 × 10^-5 m b. 1.8 × 10^-4 m d. 3.6 × 10^-5 m