Find the sum of the following two vectors: (i) 50 units due east and (ii) 100 units 30° south of west
a. 100 units 30° south of west b. 62 units 54° south of west
c. 87 units 60° south of west d. 62 units 15° south of west
b
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Red and blue in redshift and blueshift refer to color
a. True b. False Indicate whether the statement is true or false
A 2.0-m rope is lying on a table. You pick up one end and start raising it vertically. How high above the table is the center of mass of the rope when half of the rope has lifted off the table?
A) 0.25 m B) 0.50 m C) 0.75 m D) 1.0 m E) 1.5 m
An avalanche of ice and snow of mass 1 500 kg slides a vertical distance of 190 m down a mountainside. If the temperature of the ice, snow, mountain and surrounding air are all at 0°C, what is the change in entropy of the universe?
a. 2.05E+4 J/K b. 1.02E+4 J/K c. 5.12E+3 J/K d. 3.41E+3 J/K e. 1.04E+3 J/K
A skilled ballet dancer appears to move in a seemingly floating motion, seeming to defy gravity in a grand jeté. Part of how this is done is by:
a. moving her arms and legs to keep her center of mass at the about same height above the ground. b. moving her arms and legs to cause her center of mass to move upward while falling. c. being supported from the ceiling by a hidden cable not visible to the audience. d. moving her arms and legs so that as her center of mass moves, she keeps her head at the same height above the ground. e. moving her arms and legs so that her center of mass is kept from accelerating downward.