The central, completely dark portion of a shadow is call the ______________
Fill in the blank(s) with correct word
umbra
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Convection in the outer layers of a star like the Sun helps mixing and makes more hydrogen available for burning.
Answer the following statement true (T) or false (F)
A lens that is thinner at the center than the edges
a. is a converging lens. b. is a diverging lens. c. always forms a real image. d. always forms a virtual image. e. none of the above
A gasoline engine with an efficiency of 32.6% operates between a high temperature T1 and a low temperature T2 = 320 K. If this engine operates with Carnot efficiency, what is the high-side temperature T1?
a. 980 K b. 700 K c. 1 050 K d. 480 K e. 220 K
A ball thrown into the air follows a parabolic trajectory. At the highest point in the trajectory
A. both the velocity and the acceleration are zero. B. the velocity is zero, but the acceleration is not zero. C. neither the acceleration nor the velocity are zero. D. the acceleration is zero but the velocity is not zero.