Henrietta Leavitt's period-luminosity relation for ________ indicates that longer periods mean more luminosity
Fill in the blank(s) with correct word
Cepheid variables
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Suppose that you stand, motionless, on the floor. Regarding the force by the floor on your feet,
A) there is an upward force by the floor on your feet, and this force causes you to accelerate upwards. B) as long as you remain motionless, there is no force by the floor on your feet. C) there is an downward force by the floor on your feet, even though you are not accelerating. D) there is a downward force by the floor on your feet, and this force causes you to accelerate downwards. E) there is an upward force by the floor on your feet, even though you are not accelerating.
In a mass spectrometer where ions are fired at a given speed perpendicular to the magnetic field, what would be the ratio r20/r22 of the radii of the paths for singly-ionized neon atoms of masses 20 u and 22 u?
1.100/121 2.10/11 3.11/10 4.121/100
A 2.00-kg mass oscillates on the end of a spring with spring constant 12.0 N/m
Its amplitude of oscillation decreases from 10.0 cm to 1.0 cm in 2.00 s. What is the angular frequency at which this oscillator will have its peak amplitude? A) 7.28 s-1 B) 0.622 s-1 C) 2.45 s-1 D) 2.16 s-1 E) 0.311 s-1
Where are S-type asteroids typically found in the Solar System?
a. in the Kuiper belt b. the inner asteroid belt c. the outer asteroid belt d. at the Lagrange points of Jupiter e. near Earth