An object is placed 40 cm in front of a 20 cm focal length converging lens. How far is the image of this object from the lens?
A)
40 cm
B)
80 cm
C)
20 cm
D)
13 cm
E)
none of the given answers
A
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This diagram shows how light from a binary star system would travel to Earth if the speed of light were not constant. What is its observational significance?
A) It tells us that if the speed of light were not the same for everyone, then we would not necessarily see binary stars as distinct objects. B) It shows that time runs slower for fast-moving objects. C) It shows that motion is relative. D) It shows that observers in different reference frames will not necessarily agree when two events are simultaneous.
What is the element X for the nuclide 64 30X?
A. Zn B. Se C. Gd D. Ge
Fusion is often called a "thermonuclear reaction" because
A) it is a nuclear reaction that consumes, or uses, more thermal energy than it creates. B) it is a process that converts thermal energy into nuclear energy. C) it is a nuclear reaction that is self-sustaining a sufficiently high temperatures. D) it produces nuclear energy. E) it is a nuclear reaction that produces more total energy than it consumes.
How much work is done by a person lifting a 2.0-kg object from the bottom of a well at a constant speed of 2.0 m/s for 5.0 s?
a. 0.22 kJ b. 0.20 kJ c. 0.24 kJ d. 0.27 kJ e. 0.31 kJ