A 3.00-m-long 200-N ladder, leans against a smooth vertical wall with its base on a horizontal rough floor, a distance of 1.00 m away from the wall. The ladder is not completely uniform, so its center of gravity is 1.20 m from its base
What force of friction must the floor exert on the base of the ladder to prevent the ladder from sliding down? A) 93.3 N
B) 130 N
C) 28.3 N
D) 102 N
E) 150 N
C
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A column of contained air extends from sea level to the top of the atmosphere. The contained air has mass. If the column instead contained the same mass of water, its height would be
A) 1/13.6 times as high as the atmosphere. B) about 3/4 m high. C) 10.3 m high. D) about 5.6 km high.
The fluids that are considered in this text:
(A) Have relatively low viscosities (B) Must be subjected to a normal stress to have motion (C) Have molecules that move relatively slowly (D) Move when subjected to any shear stress
The star Vega rises today at 6:40 A.M. Tomorrow it will rise at ________.
A. 6:32 A.M. B. 6:44 A.M. C. 6:40 A.M. D. 6:44 P.M. E. 6:36 A.M.
A mass is attached to a spring. It oscillates at a frequency of 4.0 Hz when displaced a distance of 2.0 cm from equilibrium and released. What is the maximum velocity attained by the mass?
A) 0.08 m/s B) 0.32 m/s C) 0.02 m/s D) 0.40 m/s E) 0.50 m/s