An aircraft flies at an altitude of 20,000 m. With what speed would it fly if M = 1?

(A) 305 m/s
(B) 300 m/s
(C) 295 m/s
(D) 290 m/s


Physics & Space Science

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What is the shortest wavelength in the Paschen series?

A) 410.2 ?m B) 365 nm C) 820.4 nm D) 410.2 nm E) 820.4 ?m

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On a velocity-time graph for a particle, suppose the plot starts at some positive velocity and then follows a straight line to zero at a later time. Which of the following must be true about a position vs. time graph for this same time interval?

a. The curve will start at a positive position value and follow a straight line to zero at the later time. b. The curve will rise steeply at first and as time goes on will level out approaching its highest position value at the later time. c. The curve will drop steeply at first and as time goes on will approach its lowest position value at the later time d. The curve will start at the zero of position and follow a straight line to its highest position at the later time.

Physics & Space Science

A coin and a ring roll down an incline at the same time. The one to first reach the bottom is the

A) ring. B) coin. C) both reach the bottom at the same time

Physics & Space Science

A red crab crawling very deep in the water where sunlight is very dim appears

A) red. B) orange. C) cyan. D) brown. E) black.

Physics & Space Science