At the instant a 2.0-kg particle has a velocity of 4.0 m/s in the positive x direction, a 3.0-kg particle has a velocity of 5.0 m/s in the positive y direction. What is the speed of the center of mass of the two-particle system?
a. 3.8 m/s
b. 3.4 m/s
c. 5.0 m/s
d. 4.4 m/s
e. 4.6 m/s
b
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Velocity Addition: Two spaceships approach Earth from opposite directions. One has a speed of 0.21c and the other a speed of 0.34c, both relative to Earth. What is the speed of one spaceship relative to the other?
A. 0.51c B. 0.55c C. 0.58c D. 0.61c E. 0.64c
Consider an aluminum rod encircling the Earth (radius 6378. km). If the linear thermal expansion coefficient of the aluminum is 24. × 10-6 (C°)-1,
and if the temperature of the rod increases by 1.0 C°, how high off the ground would the expanded ring be (assuming uniform space all around)?
Main sequence stars are fusing hydrogen into helium in their cores
Indicate whether the statement is true or false
To say that one wave is out of phase with another is to say that the waves are
A) of different amplitudes. B) of different frequencies. C) of different wavelengths. D) out of step. E) all of the above