How can the Doppler method be used to estimate the average orbital distance of a planet's orbit?
A) by measuring the speed at which the star orbits the mutual center-of-mass of the star and planet, and using Newton's theory of gravity
B) by measuring the time it takes for the star's line-of-sight velocity to cycle from peak to peak, and using Newton's version of Kepler's Third law
C) by measuring the asymmetries in the velocity curve
D) by measuring the amount by which the starlight is reduced when the planet transits
A) by measuring the speed at which the star orbits the mutual center-of-mass of the star and planet, and using Newton's theory of gravity
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You live at a latitude of 28° N. What is the angle between the northern horizon and the north celestial pole?
a. 62° b. 28° c. 40° d. 23.4° e. 5°
Consider the following statement, and explain whether or not it is sensible: If you had a very fast spaceship, you could travel to the celestial sphere in about 100 years
What will be an ideal response?
Why do we need new forms of technology to make it possible to journey to the nearest stars within a human lifetime?
What will be an ideal response?
A runaway railroad car, with mass 45.0 × 10^4 kg, coasts across a level track at 3.80 m/s when it collides with a spring-loaded bumper at the end of the track. If the spring constant of the bumper is 3.80 × 10^6 N/m, what is the maximum compression of the spring during the collision? (Assume the collision is elastic.)
a. 1.31 m b. 1.85 m c. 0.925 m d. 2.10 m e. 2.62 m