On a PV diagram, if a process involves a closed curve, the area inside the curve represents
a. internal energy.
b. heat.
c. work.
d. zero.
c
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Simple Harmonic Motion: The figure shows a graph of the velocity v as a function of time t for a system undergoing simple harmonic motion. Which one of the following graphs represents the acceleration of this system as a function of time?
A. graph a B. graph b C. graph c D. graph d
This H-R diagram shows the life track of a 1 MSun star from the time it first becomes a main-sequence star. Which numbered point represents the star when it has both hydrogen-fusing and helium-fusing shells around an inert carbon core?
A) Point 1 B) Point 2 C) Point 3 D) Point 4
For what type of object is the period-luminosity relation used for determining distances?
A) RR Lyrae variables B) T Tauri variables C) Cepheids D) Cataclysmic variables E) Planetary nebulae
A 2.0-kg body moving along the x axis has a velocity vx = 5.0 m/s at x = 0 . The only force acting on the object is given by Fx = (?4.0x) N, where x is in m. For what value of x will this object first come (momentarily) to rest?
a. 4.2 m b. 3.5 m c. 5.3 m d. 6.4 m e. 5.0 m