When scientists speak of a "sample return mission" to Mars, what do they mean?
A) a mission that scoops up rock on Mars and brings it to Earth
B) a mission that provides an example of how other missions might work in the future
C) a mission that lands humans on Mars
D) a mission that reuses a spacecraft that has already been to Mars once
A) a mission that scoops up rock on Mars and brings it to Earth
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Ethyl alcohol (ethanol) is to be boiled in a vertical tube of 2 cm inside diameter. The ethanol is to be boiled at a temperature of 78.50C and a pressure of 3000 kPa when the tube inside surface temperature is 200ºC. The ethanol entering the tube may be assumed to be 10% saturated vapor, heat of vaporization, hnfg of 842 J/kg, bubble diameter of 1 mm, and bubble velocity may be taken as 0.24 m/s. Estimate the nucleate pool boiling convective heat transfer coefficient.
What will be an ideal response?
Which of the following is NOT true about landing pages?
A. One purpose might be to encourage website visitors to complete a sales transaction. B. They should include text that directly relates to the search query or ad the visitor uses to get to the landing page. C. Websites use landing pages to measure the effectiveness of an advertisement. D. All of the above are true.
What is the primary way in which high-mass stars recycle material into the interstellar medium?
A) through stellar winds and supernova explosions B) through the formation of planetary nebulae C) through protostar formation D) through stellar winds alone
Three coplanar parallel straight wires carry equal currents I to the right as shown below. The current in the upper two wires is directed to the right, but the current in the bottom wire is directed to the left. Each pair of wires is a distance a apart. The direction of the magnetic force on the middle wire
a.
is up out of the plane of the wires.
b.
is down into the plane of the wires.
c.
is in the plane of the wires, directed upwards.
d.
is in the plane of the wires, directed downwards
e.
cannot be defined, because there is no magnetic force on the middle wire.