A mobile is made of identical objects of mass m suspended so that the lowest row has one object, the row above two objects, and the row above three objects. All the strings are at 45° angles. What is the average tension in the strings connecting the highest row to the ceiling?
A.
B.
C.
D.
E.
Answer: B
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Wave Characteristics: A certain part of the electromagnetic spectrum ranges from 200 nm to 400 nm. What is the highest frequency associated with this portion of the spectrum? (c = 3.00 × 108 m/s)
A. 1.50 × 1014 Hz B. 7.50 × 1013 Hz C. 7.50 × 1014 Hz D. 7.50 × 1015 Hz E. 1.50 × 1015 Hz
Double-Slit Interference: A two-slit arrangement with 60.3 ?m separation between the slits is illuminated with 537.0-nm wavelength light. If a viewing screen is located 2.14 m from the slits, find the distance on the screen from the first dark fringe on one side of the central maximum to the second dark fringe on the other side.
A. 57.2 mm B. 38.1 mm C. 76.3 mm D. 26.9 mm
Only two forces act on a 3.0-kg mass. One of the forces is 9.0 N east, and the other is 8.0 N in the direction of 62° north of west. What is the magnitude of the acceleration of the mass?
A. 2.0 m/s2 B. 2.4 m/s2 C. 3.3 m/s2 D. 2.9 m/s2 E. 5.7 m/s2
To determine the location of the center of mass of a car, the car is driven over a scale. When the front wheels are over the scale, the weight recorded by the scale is 5800 N, and when the rear wheels are over the scale, the scale reads 6500 N
The distance between the front and rear wheels is 3.20 m. How far behind the front wheels is the center of mass located? A) 0.845 m B) 1.50 m C) 1.59 m D) 1.69 m E) 1.72 m