The Universe is isotropic, but not homogenous
a. True
b. False
Indicate whether the statement is true or false
False
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Some young star clusters contain large numbers of T Tauri stars
a. True b. False Indicate whether the statement is true or false
Spherical Mirrors: A concave spherical mirror with a radius of curvature of 20 cm creates a real image 30 cm from the mirror. How far is the object from the mirror?
A. 20 cm B. 15 cm C. 7.5 cm D. 5.0 cm
The radius of Earth is
A. larger at the equator. B. the same everywhere. C. not known. D. larger at the poles.
Two long straight parallel wires separated by a distance of 20 cm carry currents of 30 A and 40 A in opposite directions. What is the magnitude of the resulting magnetic field at a point that is 15 cm from the wire carrying the 30-A current and 25 cm from the other wire?
a. 51 ?T b. 33 ?T c. 72 ?T d. 64 ?T e. 46 ?T