One 20-year-old twin brother takes a space trip with a speed of 0.80c for 30 years according to a clock on the spaceship. Upon returning to the Earth, what is his own age and the age of the Earth-based twin brother?
A) 20; 30
B) 30; 50
C) 40; 60
D) 50; 70
E) 70; 90
D
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The equation of motion of a particle undergoing simple harmonic motion in the y direction is y = (2.0 cm) sin(0.60 s-1 t). At time t = 0.60 s determine the particle's (a) position, (b) velocity, and (c) acceleration
What will be an ideal response?
This photo shows an object located in the halo of our Milky Way galaxy. Notice the many bright red dots in the photograph. What are they?
A) red giant stars B) cool, red main-sequence stars of spectral type M C) old white dwarf stars that have turned red in color D) massive supergiant stars E) starspots
Suppose that in an examination of a spinal injury it is found that the spinal fluid (with about the same density as water) will rise a vertical height of 13. cm in an open tube
What pressure does this correspond to, expressed in mm of mercury and in atmospheres?
Stars that are visible in the local sky on any clear night of the year, at any time of the night, are called
A) bright. B) seasonal. C) circumpolar. D) celestial.