Three particles are placed in the xy plane. A 40-g particle is located at (3, 4) m, and a 50-g particle is positioned at (-2, -6) m. Where must a 20-g particle be placed so that the center of mass of this three-particle system is located at the origin?
a. (-1, -3) m
b. (-1, 2) m
c. (-1, 12) m
d. (-1, 7) m
e. (-1, 3) m
D
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A student lifts a weight of 10.0 N a distance of 0.5 meters. If this exercise is repeated 50 times in 100 seconds, then the power of this exercise is
A. 2.5 Watts. B. 3.1 Watts. C. 3.6 Watts. D. 4.0 Watts. E. 4.8 Watts.
A car accelerates from rest to a speed of 19.0 m/s in 6.00 seconds. If the car weighs 16,000 N, what average power must the motor produce to cause this acceleration? Use g = 10 m/s2
A) 128 kW B) 15.0 kW C) 49.1 kW D) 219 kW E) 393 kW
A hot B8V star whose spectra shows a high metallicity is most likely a _____ star
A. Pop III
B. Pop II
C. Pop I
D. Dark Matter Star
Briefly explain why white-dwarf supernovae are useful for measuring cosmic distances
What will be an ideal response?