The direction of an electric field is defined as the direction of force on
A) a positively-charged particle.
B) a negatively-charged particle.
C) any charged particle.
Answer: A
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A baseball is thrown by the center fielder (from shoulder level) to home plate where it is caught (on the fly at shoulder level) by the catcher. At what point is the magnitude of the acceleration at a minimum? Note: Air resistance is negligible
a. just after leaving the center fielder's hand b. just before arriving at the catcher's mitt c. at the top of the trajectory d. acceleration is constant during the entire trajectory
Because they all involve formation of iron in cores of massive stars, all type II supernovae are equally luminous
Indicate whether the statement is true or false
The lowest density material from the Earth is expected to be found in the
A) inner core B) mantle C) outer core D) crust
A flashlight bulb operating at a voltage of 5.0 V has a resistance of 7.0 ?. How many electrons pass through the bulb filament per second (e = 1.6 × 10^?19 C)?
a. 1.1E+16 b. 5.6E+21 c. 2.2E+17 d. 4.5E+18 e. 8.8E+19