A plane flies directly between two cities, A and B, which are separated by 2300 mi. From A to B, the plane flies into a 65 mi/h headwind. On the return trip from B to A, the wind velocity is unchanged
The trip from B to A takes less than the trip from A to B. What is the airspeed of the plane, assuming it is the same in both directions?
A) 530 mi/h
B) 400 mi/h
C) 480 mi/h
D) 610 mi/h
Answer: A
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a. To absorb the radio energy collected by the dish b. To collect and focus the radiation c. To follow a signal d. To move the telescope e. To control the shape of the dish
Protostars are observable by radio telescopes but hard to detect in visible light because they have ________ and are ________.
A. low surface temperature; very distant B. small size; very distant C. low surface temperature; surrounded by dust D. small size; very hot
As a star like the Sun evolves into a red giant, its core
A. expands and cools. B. turns into uranium. C. turns into iron. D. expands and heats. E. contracts and heats.
Since ?0 = 8.85 × 10?12 C2 / N ? m2, the units of ?0E2 can be reduced to
A.
.B.
.C.
.D.
.E.
.