Who discovered the period-luminosity relationship, and why was it so critical?
What will be an ideal response?
Henrietta Leavitt discovered the period-luminosity relationship for Cepheid variables in 1908, which later allowed astronomers to use them as a cosmic yardstick and recognize our Sun's true position in our Galaxy, as well as our Galaxy's true place in the universe.
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A car starts from rest and accelerates with a constant acceleration of 1.00 m/s2 for 3.00 s. The car continues for 5.00 s at constant velocity. How far has the car traveled from its starting point?
A) 24.0 m B) 9.00 m C) 19.5 m D) 4.50 m E) 15.0 m
What did the Universe used to look like?
A.) Transparent. B.) Translucent. C.) Colorful. D.) Opaque. E.) Photons.
A spring stretches by 21.0 cm when a 135 N object is attached. What is the weight of a fish that would stretch the spring by 31 cm?
A) 199 N B) 91.0 N C) 145 N D) 279 N
A horizontal force of magnitude 6.5 N is exerted tangentially on a Frisbee of mass 32 grams and radius 14.3 cm. Assuming the Frisbee, a uniform disk, is originally at rest and the force is exerted for 0.08 s, determine the angular velocity of rotation about the central axis when the Frisbee is released