Compared to a single lamp connected to a battery, two identical lamps connected in series to the same battery will carry
A) more current.
B) less current.
C) the same current.
Answer: B
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For general projectile motion, when the projectile is at the highest point of its trajectory
A) its acceleration is zero. B) its velocity is perpendicular to the acceleration. C) its velocity and acceleration are both zero. D) the horizontal component of its velocity is zero. E) the horizontal and vertical components of its velocity are zero.
Why are Cepheid variables important?
A) Cepheid variables are stars that vary in brightness because they harbor a black hole. Therefore, they provide direct evidence for black holes. B) Cepheids variables are supermassive stars that are on the verge of becoming supernovae. Therefore they allow us to choose candidates to watch if we hope to observe a supernova. C) Cepheids variables are a type of irregular galaxy, much more common in the early universe. Therefore they help to understand how galaxies formed. D) Cepheids variables are pulsating stars whose pulsation periods are directly related to their true luminosities. Therefore they can be used as distance indicators.
How can interstellar dust block starlight in spite of its extremely low density?
What will be an ideal response?
The zeroth law of thermodynamics states that
A. energy is conserved B. heat will flow from colder temperature to hotter temperature C. two objects in thermal equilibrium with each other have the same temperature D. the effect of 4.19 Joule of work is the same as that of 1 calorie of heat in increasing the temperature of the system