Why does the Doppler shift method of detecting extrasolar planets only give us the minimum mass of a planet?
A) because we don't necessarily know the density of the planet
B) because we don't necessarily know the angle the planet's orbit makes with our line of sight
C) because we don't necessarily know the diameter (size) of the planet
D) because we don't necessarily know the mass of the parent star very
B
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) Based on observations, which of the following statements about stars in the Milky Way is generally true?
A) the older the star, the lower its abundance of heavy elements B) the older the star, the bluer its color C) the older the star, the faster its orbital speed D) the younger the star, the higher its mass E) the less massive the star, the older it is
In Fizeau's experiment for measuring the speed of light, the wheel has 475 notches. What rotational speed is required for the return beam of light to pass through the next notch? The time between successive notches is 6.65 × 10-5 s
A) 20.4 rev/sec B) 16.6 rev/sec C) 31.7 rev/sec D) 66.4 rev/sec E) 90.9 rev/sec
A 500-eV electron and a 300-eV electron trapped in a uniform magnetic field move in circular paths in a plane perpendicular to the magnetic field. What is the ratio of the radii of their orbits?
a. 2.8 b. 1.7 c. 1.3 d. 4.0 e. 1.0
Motor 1 does 30 J of work in 10 s, motor 2 does 2 J of work in 5 s, motor 3 does 7 J of work in 2 s, and motor 4 does 7 J of work in 3 s. List the motors in order of highest power produced to lowest power produced
a. 2, 4, 1, 3 c. 1, 3, 4, 2 b. 3, 4, 1, 2 d. 3, 1, 4, 2