An astronaut is in equilibrium when he is positioned 140 km from the center of asteroid X and 581 km from the center of asteroid Y, along the straight line joining the centers of the asteroids. What is the ratio of the masses X/Y of the asteroids?
A) 0.0581
B) 17.2
C) 0.241
D) 4.15
A
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A Udimet 700 turbine blade is exposed to a temperature of 1200 K (2160 R) at a tensile stress of 140 MPa (20 ksi)? How many hours is the turbine blade expected to survive these conditions?
What will be an ideal response?
Harry pulls on the end of a spring attached to a wall. The reaction to Harry's pull on the spring is
A) the wall pulling oppositely on the spring. B) the spring pulling on Harry. C) both the wall and the spring pulling on Harry. D) none of the above
A swimmer swims 20 laps in a north-south facing pool in 7.00 minutes. Her first lap is toward the north. Her displacement and average velocity are
A. 0; 0. B. 0; 2.38 m/s, south. C. 0; 2.38 m/s, north. D. 1 000 m, south; 2.38 m/s, south. E. 1 000 m, north; 2.38 m/s, north.
At a certain elevation, the ________ , the air becomes saturated and water-vapor molecules ________
A) lifting condensation level; condense to mark the base of cloud formation B) equilibrium level; condense to mark the base of cloud formation C) lifting condensation level; stabilize and mark the upper limit of cloud formation D) equilibrium level; stabilize and mark the upper limit of cloud formation