Length Contraction: How fast would a rocket ship have to move past Earth to contract to half of its proper length as observed by an Earth-based physicist?
Fill in the blank(s) with the appropriate word(s).
0.87c
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A large 8 ft by 4 ft thermopane glass window loses 300 Btu/hr of heat when the inside temperature is 70ºF. If the thermopane has an average thermal conductivity of 0.032 Btu/hr·ft·ºF and is ½ inch thick, estimate the outside temperature of the window.
What will be an ideal response?
A(n)__________is a sensitive astronomical instrument that measures the brightness of individual objects very precisely
A) photometer B) grating C) charge-coupled device D) array detector
Which makes central use of the binary system?
A) phonograph records B) DVDs C) both of these D) neither of these
In a demonstration, a 4.00 cm2 square coil with 10,000 turns enters a larger square region with a uniform 1.50-T magnetic field at a speed of 100 m/s. The plane of the coil is perpendicular to the field lines. If the breakdown voltage of air is 4000 V/cm on that day, the largest gap you can have between the two wires connected to the ends of the coil and still get a spark is
A. 7.5 × 10?3 cm. B. 0.015 cm. C. 7.5 cm. D. 13 cm. E. 15 cm.