What kind of time can be read directly from a sundial?
A) apparent solar time
B) mean solar time
C) standard time
D) universal time
A
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If the average velocity is non-zero over a time interval, does this mean that the instantaneous velocity is never zero over that same time interval?
A. Yes B. No
A laser can be used for very accurate measurements of distances between objects
Indicate whether the statement is true or false
The planetary model of the hydrogen atom consists of an electron in a circular orbit about a proton. The motion of the electron of charge 1.60 × 10^?19 C creates an electric current. The radius of the electron orbit is 5.30 × 10^?11 m and the electron's velocity is 2.20 × 10^6 m/s. What is the magnetic field strength at the location of the proton?
Two horizontal curves on a bobsled run are banked at the same angle, but one has twice the radius of the other. The safe speed (for which no friction is needed to stay on the run) for the smaller radius curve is v
What is the safe speed on the larger-radius curve? A) v / B) 2v C) v D) v/2