Instructions: On occasion, the notation 
will be a shorthand notation for 
.
When three vectors, 
, 
, and 
are placed head to tail, the vector sum + + = 0. If the vectors all have the same magnitude, the angle between the directions of any two adjacent vectors is
A. 30°
B. 60°
C. 90°
D. 120°
E. 150°
Answer: D
You might also like to view...
An organ pipe is 60.0 cm long and is open at one end and closed at the other. The frequency of the third mode is 300 Hz higher than the frequency of the second mode. What is the velocity of sound?
A. 280 m/s B. 300 m/s C. 320 m/s D. 340 m/s E. 360 m/s
In a perfectly elastic collision, a 400-g ball moving toward the east at 3.7 m/s suddenly collides head-on with a 200 g ball sitting at rest. (a) Determine the velocity of the first ball just after the collision
(b) Determine the velocity of the second ball just after the collision. (c) Is kinetic energy conserved in this collision? How do you know?
A Carnot refrigerator takes heat from water at 0°C and rejects heat to a room at 12°C. Suppose that 92.0 grams of water at 0°C are converted to ice at 0°C by the refrigerator
Calculate the mechanical energy that must be supplied to the refrigerator. The heat of fusion of water is 3.34 × 105 J/kg.
A wind farm generator uses a two-bladed propeller (see figure) mounted on a pylon at a height of 20 m
The length of each propeller blade is 12 m. A small piece from the tip of the propeller breaks off when the propeller is vertical. At that instant, the period of the motion of the propeller is 1.2 s. The fragment flies off horizontally, falls with negligible air resistance, and strikes the ground at P. (a) How far is point P from the base of the pylon? (b) At what angle with respect to the vertical is the fragment moving just as it strikes the ground at P? What will be an ideal response?