Equilibrium: As shown in the figure, a 10.0 m long bar is attached by a frictionless hinge to a wall and held horizontal by a light rope that makes an angle ? = 49° with the bar. The bar is uniform and weighs 66.5 N. What distance x from the hinge should a 10.0 kg mass be suspended for the tension in the rope to be 177 N?
Fill in the blank(s) with the appropriate word(s).
10 m
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A 0.30-kg mass attached to the end of a string swings in a vertical circle (R = 1.6 m), as shown. At an instant when ? = 50°, the tension in the string is 8.0 N. What is the magnitude of the resultant force on the mass at this instant?
A. 5.6 N B. 6.0 N C. 6.5 N D. 5.1 N E. 2.2 N
A light wave traveling in air strikes a plane mirror surface at an angle of 30° relative to the normal. The wave is reflected at an angle of
a. 30° relative to the surface. b. 30° relative to the normal. c. 60° relative to the normal. d. none of these.
Describe a conservative force
What will be an ideal response?
How much energy is stored in a room 3.0 m by 4.0 m by 2.4 m due to the earth's magnetic field with a strength of 5.0 × 10-5 T? (?0 = 4? × 10-7 T • m/A)
A) 29 mJ B) 57 mJ C) 10 mJ D) 100 mJ E) 570 mJ