Three masses, 1.0 kg, 2.0 kg, and 3.0 kg, are located at (0.0 m, 0.0 m), (1.0 m, 1.0 m), and (2.0 m, -2.0 m), respectively. What is the location of the center of mass (or center of gravity) of this system?
A) (1.3 m, 0.67 m)
B) (1.3 m, -0.67 m)
C) (-1.3 m, 0.67 m)
D) (-1.3 m, -0.67 m)
B
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Two-thirds of all known millisecond pulsars are found in what type of object?
A) open clusters B) extremely distant galaxies C) giant molecular clouds D) globular clusters E) emission nebulae
A parachutist jumping from an airplane reaches a terminal velocity when the force of air resistance is 980 N. The mass of the parachutist is
A. 980 kg. B. 220 lb. C. 100 kg. D. 100 lb. E. 980 lb.
A baseball thrown from the outfield is released from shoulder height at an initial velocity of 39.2 m/s at an initial angle of 30.0° with respect to the horizontal. If it is in its trajectory for a total of 4.00 s before being caught by the third baseman at an equal shoulder-height level, what is the ball's net vertical displacement during its 4.00-s trajectory?
a. 11.0 m c. 22.1 m b. 9.80 m d. zero
What is the percent uncertainty in the measurement 2.58 ± 0.15 cm?
A) 2.9% B) 5.8% C) 8.7% D) 12% E) 15%