Analysis of stellar spectra shows that most stars consist of 71% ________, 27% ________, and a 2% mix of the other elements.
A. hydrogen; helium
B. hydrogen; oxygen
C. helium; hydrogen
D. oxygen; nitrogen
Answer: A
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A rod (length = 2.0 m) is uniformly charged and has a total charge of 5.0 nC. What is the electric potential (relative to zero at infinity) at a point which lies along the axis of the rod and is 3.0 m from the center of the rod?
A. 22 V B. 19 V C. 16 V D. 25 V E. 12 V
If you push directly on the handle of a closed door and it does not swing open, then
A. the net torque on the door must be zero. B. the lever arm must be very small. C. its rotational inertia must be much larger than your torque. D. the angular momentum of the door is larger than your force.
__________is a number between 1 and 0 that describes the shape of an ellipse
A) Acceleration B) Momentum C) Mass D) Eccentricity
A small object is enclosed in plastic (n = 1.5). The object appears to be 4.0 cm below the surface. What is the actual distance of the object below the surface?
B. 2.7 cm C. 4.0 cm D. 5.5 cm E. 6.0 cm